Bypassed heater core by connecting hoses together. Problem is heater blower turns on and instrument panel goes dead. Concerned, is there a relay or fuse I should disconnect?

See me at website for images can only send one through this channel. www.autorepairhelp.us

Best Regards,

Master Tech Lee

HEATER BOX SHIELD
Image
Heater Box Heat Shield
Remove or Disconnect
1. Fasteners that retain heat shield to heater box assembly.
Image [ Heater Box Heat Shield
Install or Connect
1.Fasteners that retain heat shield to heater box assembly.
Tighten
-Bolts Screws to 2.2 N.m (25 lb in).
HEATER ASSEMBLY
Image ' Heater Hoses
Image ' A/C Evaporator Tube Assembly
Image ' Evaporator Core
Image ' Evaporator Core Assembly
Image ' Heater Assembly
Remove or Disconnect
1.Engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.
2.Heater hoses. Refer to Heater Hoses.
3.Instrument panel. Refer to Instrument Panel Replacement in Interior Trim.
4.Air inlet assembly. Refer to Air Inlet Assembly Replacement.
5.Vacuum lines.
Important
-Clearly label vacuum line connections.
6.Heater assembly studs inside engine bay.
7.Blower motor resistor. Refer to Blower Motor Resistor.
8.Stud inside heater core housing.
-Stud is revealed by removing the blower motor resistor.
9.Rear case screws.
10.Heater assembly.
11.Seals.
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Heater Hoses
A/C Evaporator Tube Assembly
Evaporator Core
Evaporator Core Assembly
Heater Assembly
Install or Connect
1.Seals.
2.Heater assembly.
3.Rear case screws.
4.Stud inside heater core housing.
Tighten
-Stud to 1.9 N.m (17 lb in).
5.Blower motor resistor. Refer to Blower Motor Resistor.
6.Heater assembly studs inside engine bay.
Tighten
-Studs to 1.9 N.m (17 lb in).
7.Vacuum lines.
8.Air inlet assembly. Refer to Air Inlet Assembly Replacement.
9.Instrument panel. Refer to Instrument Panel Replacement in Interior Trim.
10.Heater hoses. Refer to Heater Hoses.
11.Engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.
-Check the system for leaks.


Auto Repair Help US

Heater Core REMOVAL & INSTALLATION CAUTION
Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old. Front 1988-91 R/V SERIES WITHOUT AIR CONDITIONING

1. Disconnect the negative battery cable.
2. Disconnect the heater hoses at the core tubes and drain the engine coolant. Plug the core tubes to prevent spillage.
3. Remove the nuts from the distributor air ducts in the engine compartment.
4. Remove the glove compartment and door.
5. Disconnect the air-defrost and temperature door cables.
6. Remove the floor outlet and unfasten the defroster duct-to-heater distributor screw.
7. Remove the heater distributor-to-instrument panel screws. Pull the assembly rearward to gain access to the wiring harness and disconnect the wires attached to the unit.
8. Remove the heater distributor from the truck.
9. Remove the heater core retaining straps and remove the core from the truck. To install:
   
10. Install the heater core. Be sure that the case-to-core and case-to-dash panel sealer is intact.
11. Position the heater distributor. Connect the wires attached to it and then install the heater distributor-to-instrument panel screws.
12. Install the floor outlet and tighten the defroster duct-to-heater distributor screw.
13. Connect the air-defrost and temperature door cables.
14. Install the glove compartment and door.
15. Install the nuts into the distributor air ducts (in the engine compartment).
16. Connect the heater hoses at the core tubes.
17. Connect the negative battery cable. Fill the cooling system and check for leaks.

1988-91 R/V SERIES WITH AIR CONDITIONING

1. Disconnect the negative battery cable.
2. Disconnect the heater hoses at the core tubes and drain the engine coolant. Plug the core tubes to prevent spillage.
3. Remove the glove compartment and door.
4. Disconnect the center duct from the defroster outlet duct.
5. Disconnect the center, lower air distributor and the center air outlet ducts.
6. Disconnect the temperature door cable.
7. Remove the nuts from the 3 selector duct studs that project into the engine compartment.
8. Remove the outlet duct-to-instrument panel screws. Pull the assembly rearward to gain access to the wiring harness and disconnect the wires and vacuum tubes attached to the unit.
9. Remove the heater distributor from the truck.
10. Remove the heater core retaining straps and remove the core from the case. To install:
    
11. Install the heater core. Be sure that the core-to-core and case-to-dash panel sealer is intact.
12. Position the heater distributor. Connect the wires attached to it and then install the heater distributor-to-instrument panel screws.
13. Install the floor outlet and tighten the defroster duct-to-heater distributor screw.
14. Connect the temperature door cable.
15. Connect the center and lower air distributors and the center air outlet ducts.
16. Connect the center duct to the defroster outlet duct.
17. Install the glove compartment and door.
18. Connect the heater hoses at the core tubes.
19. Connect the negative battery cable. Fill the cooling system and check for leaks.

1988-90 C/K SERIES

1. Disconnect the negative battery cable.
2. Remove the coolant overflow bottle.
3. Drain the cooling system.
4. Disconnect the heater hoses at the core tubes.
5. In the engine compartment, remove the heater case-to-firewall screws.
6. Disconnect the antenna cable at the mast.
7. Remove the glove box.
8. Disconnect the wiring harness at the engine's Electronic Control Module (ECM).
9. Remove the ECM and bracket.
10. Remove the right side kick panel.
11. Remove the right side lower dash panel bolt and nut.
12. Remove the heater case mounting bolts.
13. While lifting the instrument panel slightly, remove the case assembly.
14. Lift the core from the case. To install:
    
15. Lower the core into the case.
16. Position the case assembly against the firewall.
17. Install the heater case mounting bolts.
18. Install the right side lower dash panel bolt and nut.
19. Install the right side kick panel.
20. Install the ECM and bracket.
21. Connect the ECM wiring harness.
22. Install the glove box.
23. Connect the antenna cable at the mast.
24. Install the heater case-to-firewall screws.
25. Connect the heater hoses at the core tubes.
26. Fill the cooling system.
27. Install the coolant overflow bottle.
28. Connect the battery cable.

1991-92 R/V AND 1991-98 C/K SERIES

1. Disconnect the negative battery cable.
2. Drain the cooling system.
3. Remove the instrument panel glove compartment.
4. Tag and unplug all electrical leads as necessary.
5. Remove the center air distribution duct from the floor.
6. If necessary, remove the ECM and mounting tray.
7. Remove the hinge pillar trim panels.
8. Remove the blower motor cover and then remove the motor.
9. Remove the steering wheel and tilt back the instrument panel slightly.
10. Remove the coolant overflow tank. Disengage the heater hoses at the core connections.
11. Unfasten the attaching screws and nut and then remove the heater case.
12. Remove the seven screws and lift off the heater case cover.
13. Remove the fasteners and brackets that hold the heater core to the case and lift the core from the case. To install:
    
14. Install the heater core in the case.
15. Install the heater case bottom plate. Make sure there is a good seal.
16. Install the heater case into the truck. Tighten the 4 lower screws to 17 inch lbs. (2 Nm); the upper screw to 97 inch lbs. (11 Nm); and the nuts to 25 inch lbs. (2.8 Nm).
17. Connect the heater hoses at the core tubes.
18. Install the coolant overflow tank.
19. Install the instrument panel and the steering wheel.
20. Install the blower motor and cover.
21. Install the trim panels and if removed, the ECM. Install the air distribution duct and reconnect all electrical leads.
22. Install the glove compartment. Fill the cooling system and connect the battery cable.

Rear 1988-91 MODELS

1. Disconnect the negative battery cable.
2. Drain the cooling system.
3. Disconnect the heater hoses at the core tubes.
4. Disconnect the blower motor wiring harness.
5. Remove the blower motor clamp.
6. Remove the motor attaching screws and lift out the motor.
7. Unfasten the upper-to-lower case half screws and remove the upper case half.
8. Remove the core seal.
9. Lift out the core. To install:
   
10. Install the heater core.
11. Install the core seal.
12. Install the upper case half and then tighten the upper-to-lower case half screws.
13. Install the motor and then tighten the attaching screws.
14. Install the blower motor clamp.
15. Connect the blower motor wiring harness.
16. Connect the heater hoses at the core tubes.
17. Fill the cooling system.
18. Connect the negative battery cable.

1992-98 MODELS

1. Disconnect the negative battery cable and drain the engine coolant.
2. Remove the right rear quarter panel trim and then remove the panel itself.
3. Remove the right rear wheelhousing liner.
4. Disconnect the heater hoses from the core.
5. Unplug the electrical lead. Remove the drain valve.
6. Remove the heater module.
7. If necessary, remove the blower motor.
8. Remove the heater case cover.
9. Remove the heater case cover and then remove the heater core. To install:
   
10. Install the heater core and then install the heater case cover.
11. If removed, install the blower motor.
12. Remove the heater module.
13. Attach the electrical lead. Install the drain valve.
14. Connect the heater hoses to the core.
15. Install the right rear wheelhousing liner.
16. Install the right rear quarter panel and then install the trim.
17. Connect the negative battery cable and fill the engine with coolant.

Heater Core - REMOVAL & INSTALLATION
1991-92 R/V and 1991-98 C/K Series

1. Disconnect the negative battery cable.
2. Drain the cooling system.
3. Remove the instrument panel glove compartment.
4. Tag and unplug all electrical leads as necessary.
5. Remove the center air distribution duct from the floor.
6. If necessary, remove the ECM and mounting tray.
7. Remove the hinge pillar trim panels.
8. Remove the blower motor cover and then remove the motor.
9. Remove the steering wheel and tilt back the instrument panel slightly.
10. Remove the coolant overflow tank. Disengage the heater hoses at the core connections.
11. Unfasten the attaching screws and nut and then remove the heater case.
12. Remove the seven screws and lift off the heater case cover.
13. Remove the fasteners and brackets that hold the heater core to the case and lift the core from the case.

To install:

1. Install the heater core in the case.
2. Install the heater case bottom plate. Make sure there is a good seal.
3. Install the heater case into the truck. Tighten the 4 lower screws to 17 inch lbs. (2 Nm); the upper screw to 97 inch lbs. (11 Nm); and the nuts to 25 inch lbs. (2.8 Nm).
4. Connect the heater hoses at the core tubes.
5. Install the coolant overflow tank.
6. Install the instrument panel and the steering wheel.
7. Install the blower motor and cover.
8. Install the trim panels and if removed, the ECM. Install the air distribution duct and reconnect all electrical leads.
9. Install the glove compartment. Fill the cooling system and connect the battery cable.

Blower Motor - REMOVAL & INSTALLATION
1992-98 Models
(see Figure 4)

1. Disconnect the negative battery cable.
2. Remove the right rear quarter panel trim.
3. Disconnect the electrical lead at the fan.
4. Remove the screws and if equipped, the cooling tube.
5. If necessary, remove the fan retaining nut and lift out the blower fan.
6. Remove the blower motor.
   

To install:

1. Install the blower motor and then position the fan.
2. Install the retaining nut and then tighten the mounting screws to 12 inch lbs. (2 Nm).
3. If removed, install the cooling tube.
4. Connect the electrical lead. Install the quarter panel trim cover.
5. Connect the battery cable.

Fig. 4: Auxiliary heating and A/C system

Hope this helps (remember to rate this answer).

Removal & Installation 1997-2002 To Remove:
NOTE: Heater core must be vacuum leak tested before it is remove from vehicle if a heater core leak is suspected.

1. Drain engine coolant.
2. Remove instrument panel.
3. For 5.4L (4V), if quipped, remove junction splash shield.
4. For 5.4L (4V), if quipped, disconnect starter relay cable.
   
   
5. For 5.4L (4V), if quipped, remove junction block bracket.
6. Clamp inlet and outlet heater hoses.
7. Disconnect heater hose from heater core by gently pressing it toward heater core.
8. Remove A/C plenum demister adapter.
9. Disconnect vacuum line.
10. Remove 13 plenum chamber top screws.
11. Remove blend door assembly from case.
12. Remove heater core.

To Install:
NOTE: If needed, clean and lubricate coolant hoses with plain water.

1. Install heater core.
2. Install blend door assembly to case.
3. Install 13 plenum chamber top screws.
4. Connect vacuum line.
5. Install A/C plenum demister adapter.
6. Connect heater hose to heater core.
7. Release all clamps from inlet and outlet heater hoses.
8. For 5.4L (4V), if quipped, install junction block bracket.
9. For 5.4L (4V), if quipped, connect starter relay cable.
10. For 5.4L (4V), if quipped, install junction splash shield.
11. Install instrument panel.
12. Refill engine coolant.

Deluxe Hi-Lo Heater

1. Disconnect the battery cable, remove the carburetor air cleaner and partially drain the coolant system.
   
2. Remove the heater hoses from the heater core.
   
3. Remove the glove box liner and remove the register duct by pulling from the instrument panel register and releasing the clip at the plenum.
   
4. Disconnect the right cowl outside air inlet vacuum hose from the outside/recirculating door vacuum motor.
   
5. Remove the rear housing from under the instrument panel. Remove the outside air inlet duct from the rear housing (4 nuts and 1 bolt) and install one upper nut to retain heater housing-to-dash after rear housing is removed.
   
6. Remove two screws retaining plenum-to-dash (above transmission tunnel) and two screws to heater housing and remove the plenum.
   
7. Install a piece of protective tape on A-pillar inner cowl panel, at lower right corner of instrument panel.
   
8. Remove the lower right instrument panel-to-A-pillar bolt to hold the panel in the rearward position.
   
9. Remove the heater core (3 screws retaining 2 plates).
   
10. Remove the temperature blend door (snaps off).
    
11. Remove the temperature blend door arm support (2 screws) and pivot arm retainer (1 screw).
    
12. Remove blower motor (2 screws) and remove blower wheel.
    

To install:

1. Transfer blower to blower motor and panel assembly.
   
2. Install door arm pivot retainer (1 screw) and door arm support (2 screws).
   
3. Install the temperature blend door (snaps on).
   
4. Install heater core.
   
5. Install the plenum (4 screws).
   
6. Connect blower wires.
   
7. Remove heater housing upper retaining nut and install the heater outlet (4 nuts and 1 bolt). Position the air inlet duct.
   
8. Connect the white vacuum hose to the outside/recirculating door vacuum motor.
   
9. Reposition the instrument panel, install the retaining bolts and remove the protective tape at the A-pillar inner cowl panel, lower right corner of instrument panel.
   
10. Install the right register duct assembly and install the glove box liner.
    
11. Connect heater hoses to the heater core assembly.
    
12. Fill cooling system, install the air cleaner and connect the battery cable to the battery.
    
13. Check blower motor operation.
    

1. drain coolant
2.remove instrument panel
3. for 5.4 (4v) if equiped,remove junction splash shield
4.for 5.4 (4v) if equiped, disconnect starter relay cable

1. For 5.4L (4V), if quipped, remove junction block bracket.
2. Clamp inlet and outlet heater hoses.
3. Disconnect heater hose from heater core by gently pressing it toward heater core.
4. Remove A/C plenum demister adapter.
5. Disconnect vacuum line.
6. Remove 13 plenum chamber top screws.
7. Remove blend door assembly from case.
8. Remove heater core.

To Install:
NOTE: If needed, clean and lubricate coolant hoses with plain water.

1. Install heater core.
2. Install blend door assembly to case.
3. Install 13 plenum chamber top screws.
4. Connect vacuum line.
5. Install A/C plenum demister adapter.
6. Connect heater hose to heater core.
7. Release all clamps from inlet and outlet heater hoses.
8. For 5.4L (4V), if quipped, install junction block bracket.
9. For 5.4L (4V), if quipped, connect starter relay cable.
10. For 5.4L (4V), if quipped, install junction splash shield.
11. Install instrument panel.
12. Refill engine coolant.

I hope this helps you

Removal & Installation

Exploded view of the blower motor housing and the heater air plenum assemblies

1. Disconnect the negative battery cable. Allow the engine to cool down. Drain the cooling system to a level below the heater core fittings on the firewall.
   
2. Disconnect the heater hoses from the heater core tubes and plug hoses.
   
3. Remove the five nuts that secure the blower motor housing to the firewall.
   
4. Pull the housing away from the firewall. Disconnect any wire harness plugs which inhibit the housing.
   
5. Remove the remaining nuts which secure the heater air plenum (inside the passenger compartment) to the firewall.
   
6. In the passenger compartment, remove the instrument panel. Refer to Section 10.
   
7. Pull the heater air plenum rearward from the firewall and remove it from the vehicle.
   
8. Remove the heater core from the heater air plenum.
   
9. Inspect all air seals on the components and firewall and replace any that are damaged.
   

1. To install:
2. Install the heater core into the air plenum chamber.
   
3. Position the heater air plenum against the firewall from the passenger compartment.
   
4. Under the hood, install the plenum retaining nuts.
   
5. Install the blower motor housing to the firewall and install the attaching nuts.
   
6. Connect the heater hoses to the heater core tubes at the dash panel in the engine compartment. Do not over-tighten the hose clamps.
   
7. Install the instrument panel.
   
8. Check the coolant level and add coolant as required. Connect the negative battery cable.
   
9. Start the engine and check the system for coolant leaks.
   

Jeep Cherokee XJ Heater Core

Work for '92 models, but can use it like a reference guide.



Figure 1

1. Disconnect battery ground cable, then drain cooling system.
2. Disconnect hoses from heater core.
3. If equipped with A/C, remove evaporator/blower housing as follows:
   1. Discharge A/C system, then disconnect hoses from expansion valve.
   2. Disconnect electrical connector and vent tube from blower motor.
   3. Remove console, if equipped.
   4. Remove lower instrument panel attaching screws, then the lower panel.
   5. Disconnect electrical connections from A/C relay, blower motor resistors and A/C thermostat.
   6. Disconnect vacuum hose from vacuum motor.
   7. Cut evaporator/blower housing to heater core housing retaining strap, then disconnect heater control cable.
   8. Pry retaining clip from rear of blower housing flange, then remove the three retaining screws.
   9. Working from engine compartment, remove evaporator/blower housing attaching nuts, then the evaporator drain tube, Figure 1.
   10. Remove right kick panel, then the instrument panel support bolt.
   11. Pull right side of dash outward, then rotate housing downward and towards rear of vehicle until studs clear dash panel. Remove housing from vehicle.
4. Remove heater core to housing retaining screws, then the heater core, Figure 2.
5. Reverse procedure to install.

Figure 2

Personally, I'd pressure test the cooling system then look at the heater core to see if it leaks. It may just be a loose clamp or leaky hose.

Also can check the forum jpmagazine.com

I hope help you; good luck (remember rated this).

PLEASE REMEMBER TO RATE ME THANK YOU RejakWilson






HEATER CORE

Remove or Disconnect

1. Engine coolant.
2. Instrument panel storage compartment.
3. Electrical connectors, as necessary.
4. Center floor air distribution duct.
5. Hinge pillar trim panels.
6. Blower motor cover.
7. Blower motor.
8. Steering column.
9. Roll instrument panel back.
10. Coolant recovery reservoir.
11. Heater hoses.Screw on interior side of cowl, near the evaporator pipe (if equipped) while holding heater case to the cowl
12. Four screws on the engine side of the cowl holding the heater case to the cowl.
    1. Two nuts on the engine side of the cowl holding the heater case to the cowl.
    2. Heater case.
    • It may be necessary to have an assistant when removing heater case.
    1. Heater cover.
    • Remove seven screws that hold cover to the heater case.
    1. Heater core from retainer

Install or Connect

1. Heater core into retainer.

• Install seven screws that hold heater cover to heater case.

1. Heater cover.

• Make sure heater cover is properly sealed.

1. Heater case.

• May be necessary to have an assistant when installing heater case.

1. Nuts.
2. Screws.

Tighten

• Screws on engine side of the cowl to 1.9 N.m (17 lb in) .
• uts to 2.8 N.m (25 lb in) .
• Screw on interior side of the cowl to 11 N.m (97 lb in) .

1. Heater hoses.
2. Coolant recovery reservoir.
3. Roll instrument panel forward.
4. Steering column.
5. Blower motor.
6. Blower motor cover.
7. Hinge pillar trim panels.
8. Center floor air distribution duct.
9. Electrical connectors, as necessary.
10. Instrument panel storage compartment.
11. Engine coolant.

• Check the system for leaks.

here is a step by step diagram to replace your heater core
Front

1. Disconnect the negative battery cable.
   
2. Drain the cooling system.
   
3. Remove the instrument panel glove compartment.
   
4. Tag and unplug all electrical leads as necessary.
   
5. Remove the center air distribution duct from the floor.
   
6. If necessary, remove the ECM and mounting tray.
   
7. Remove the hinge pillar trim panels.
   
8. Remove the blower motor cover and then remove the motor.
   
9. Remove the steering wheel and tilt back the instrument panel slightly.
   
10. Remove the coolant overflow tank. Disengage the heater hoses at the core connections.
    
11. Unfasten the attaching screws and nut and then remove the heater case.
    
12. Remove the seven screws and lift off the heater case cover.
    
13. Remove the fasteners and brackets that hold the heater core to the case and lift the core from the case.
    

To install:

1. Install the heater core in the case.
   
2. Install the heater case bottom plate. Make sure there is a good seal.
   
3. Install the heater case into the truck. Tighten the 4 lower screws to 17 inch lbs. (2 Nm); the upper screw to 97 inch lbs. (11 Nm); and the nuts to 25 inch lbs. (2.8 Nm).
   
4. Connect the heater hoses at the core tubes.
   
5. Install the coolant overflow tank.
   
6. Install the instrument panel and the steering wheel.
   
7. Install the blower motor and cover.
   
8. Install the trim panels and if removed, the ECM. Install the air distribution duct and reconnect all electrical leads.
   
9. Install the glove compartment. Fill the cooling system and connect the battery cable.
   

1. Disconnect the negative battery cable.
   
2. Drain the engine cooling system into a clean container for reuse.
   
3. Disconnect the heater hoses from the heater core.
   
4. Remove the instrument panel storage compartment.
   
5. Disconnect the electrical connectors, as necessary, that may be in the way.
   
6. Remove the center floor air distribution duct.
   
7. Remove the hinge pillar trim kick panels.
   
8. Remove the blower motor cover screws and the cover.
   
9. Remove the blower motor screws and the blower motor.
   
10. Remove the steering wheel and the steering column (standard & tilt).
    
11. Remove the instrument panel fasteners and pull the instrument panel back far enough to gain access to the heater assembly.
    
12. While holding the heater assembly against the firewall, remove the screw located on the interior side near the evaporator pipe, if equipped.
    
13. In the engine compartment, remove the 4 heater assembly-to-chassis screws and the 2 heater assembly-to-chassis nuts.
    
    NOTE Removal of the heater assembly may require the help of an assistant.
    
14. Remove the 7 heater cover-to-heater assembly screws and the cover.
    
15. Remove the heater core from the heater assembly.
    View of the front heater assembly—Chevy/GMC C/K-Series, Blazer, Jimmy, Sierra, Suburban, Tahoe, Yukon
    Click to Enlarge Location of the front heater assembly-to-chassis fasteners—Chevy/GMC C/K-Series, Blazer, Jimmy, Sierra, Suburban, Tahoe, Yukon
    Click to Enlarge

To install:

1. Install the heater core to the heater assembly.
   
2. Install the heater cover and the 7 heater cover-to-heater assembly screws.
   
   NOTE Installation of the heater assembly may require the help of an assistant.
   
3. In the engine compartment, install the 4 heater assembly-to-chassis screws and the 2 heater assembly-to-chassis nuts. Torque the screws to 17 inch lbs. (1.9 Nm) and the nuts to 25 inch lbs. (2.8 Nm).
   
4. While holding the heater assembly against the firewall, install the screw located on the interior side near the evaporator pipe, if equipped. Torque the screw to 97 inch lbs. (11 Nm).
   
5. Install the instrument panel and the instrument panel fasteners.
   
6. Install the steering column (standard & tilt) and the steering wheel.
   
7. Install the blower motor and the blower motor screws.
   
8. Install the blower motor the cover and the cover screws.
   
9. Install the hinge pillar trim kick panels.
   
10. Install the center floor air distribution duct.
    
11. Connect the electrical connectors that were disconnected.
    
12. Install the instrument panel storage compartment.
    
13. Disconnect the heater hoses to the heater core.
    
14. Refill the engine cooling system.
    
15. Connect the negative battery cable.
    
16. Run the engine to normal operating temperatures; then, check the climate control operation and check for leaks.