Place a pan under the van and disconnect the heater intake and outlet hoses. Quickly remove and plug the hoses and support them in an upright position. Drain the coolant from the heater core into the pan.
CAUTION
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 quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
Remove the heater distributor duct-to-case attaching screws and the duct-to-engine cover screw. Remove the duct.
Remove the engine cover.
Remove all the instrument panel attaching screws.
Carefully lower the steering column. Raise and support the right side of the instrument panel. Refer to for further details.
Remove the defroster duct-to-case attaching screws and the two screws attaching the distributor to the heater case.
Disconnect the temperature door cable. Carefully fold the cable back and out of the way.
Remove the three nuts from the engine compartment side of the distributor case and the screw from the passenger compartment side.
Remove the heater case and core assembly.
Remove the core retaining straps and remove the core.
Remove the steering column-to-instrument panel bolts. Lower the column carefully.
Remove the upper and lower instrument panel attaching screws. Remove the radio support bracket screw.
Raise and support the right side of the instrument panel.
Remove the lower right instrument panel bracket.
Remove the vacuum actuator from the kick panel.
Disconnect the temperature cable and vacuum hoses at the case. Remove the heater distributor duct from over the engine hump.
Remove the two defroster duct-to-firewall attaching screws below the windshield.
Under the hood, disconnect and plug the heater hoses at the firewall.
Remove the three nuts and one screw (inside) holding the heater case to the firewall.
Remove the case from the van. Remove the gasket for access to the screws holding the case together. Remove the temperature cable support bracket. Remove the screws and separate the case. Remove the heater core.
I have a chevy uplander and you have to open the passenger door and its on the side of the dash, to the right of the glove box. You will notice a small rounf opening with just enough room for 2 fingers to go in. the whole side will come off when you pull it.
Please let me know if you have any questions, and thanks for using FixYa.
Drain the engine cooling system.
Remove or disconnect the following:Negative battery cable and Heater hoses from the heater core
Remove the instrument panel as follows:.
Set the parking brake and block the wheels.
Disconnect the parking brake release cable from the parking brake lever.
Unfasten the screws that retain the DLC instrument panel left side
sound insulator. Feed the DLC through the hole in the sound insulator.
Unfasten the right side sound insulator panel screws and remove the panel.
Unfasten the screws that attach the instrument panel left side sound insulator to the knee bolster and cowl panel.
Unfasten the nut that attaches the left side sound insulator to the accelerator pedal bracket.
Unplug the remote control door lock receiver module electrical connector.
Remove the door lock receiver module from the left side sound insulator. Remove the left side sound insulator.
Unfasten the screws that attach the instrument panel center sound
insulator to the knee bolster, instrument panel, heater assembly and
floor duct.
Remove the center sound insulator.
Unfasten the screws that attach the courtesy lamp to the knee bolster.
Unfasten the screws that attach the knee bolster to the instrument panel.
Disconnect the lap cooler duct from the knee bolster.
Unplug the lighter electrical connection and remove the knee bolster.
Unfasten the steering column-to-instrument panel nuts and lower the column.
Unfasten the screws that attach the instrument panel accessory trim plate to the instrument panel.
Remove the trim plate and unplug all necessary electrical connection.
Remove the heater and/or air conditioning control assembly.
Remove the radio and the storage compartment assembly (if equipped).
If necessary, remove the instrument cluster.
Unfasten the left and right instrument panel pivot bolts and the panel lower support bolt.
Unfasten the speaker grilles retaining screws and remove the speaker grilles.
Remove the windshield defroster grille using a flat-bladed
prytool. Start at one end of the grille and work your way down the
grille.
Unfasten the 4 instrument panel upper support screws.
Tag and unplug all necessary electrical connections.
Remove the instrument panel from the vehicle.
Remove or disconnect the following:
Air inlet assembly, if equipped
,
Vacuum hosesHeater assembly studs, from inside the engine compartment,
Blower motor resistorStud from inside the heater case assembly; the stud is located behind the blower motor resistorHeater assembly-to-chassis screws,
Heater assembly from the vehicleAccess cover screws and cover from the heater assemblyHeater core from the heater case assembly
Fig. View of the heater case assembly
Fig. View of the heater case cover
Fig. View of the heater core
Fig. Heater core mounting
To install:
Install or connect the following:
Heater core to the heater case assembly,
Access cover to the heater assembly and the cover screws,Heater assembly to the vehicleHeater assembly-to-chassis screws and torque them to 40 inch lbs. (4.5 Nm)Stud, working from inside the heater case assembly; the stud is located behind the blower motor resistor,
Blower motor resistorHeater assembly studs, working inside the engine compartment, torque them to 17 inch lbs. (1.9 Nm),
Vacuum hoses,
Air inlet assembly, if equipped
Install the instrument panel as follows:
Rest the instrument panel on the lower pivot studs.
Attach the electrical connections.
Install but do not tighten the 4 upper instrument panel support screws.
Install the left and right panel pivot bolts. Tighten the bolts to 102 inch lbs. (11.5 Nm).
Install the panel lower support bolt. Tighten the bolt to 102 inch lbs. (11.5 Nm).
Tighten the upper support screws to 17 inch lbs. (1.9 Nm).
Install the windshield defroster grille and the speaker grilles.
Install the radio and storage compartment assembly (if equipped).
If removed, install the instrument cluster.
Install the heater and/or air conditioning control assembly.
Attach the electrical connections to the instrument panel accessory trim plate.
Place the trim plate in position and install its retaining screws. Tighten the screws to 17 inch lbs. (1.9 Nm).
Place the steering column into position and install its retaining nuts. Tighten the nuts to 22 ft. lbs. (30 Nm).
Attach the lighter electrical connection and the lap cooler duct to the knee bolster.
Place the knee bolster into position and install its retaining
screws. Tighten the Torx® head screws to 80 inch lbs. (9 Nm) and the hex
head screws to 17 inch lbs. (1.9 Nm).
Place the courtesy lamp in position and install its screws. Tighten the screws to 17 inch lbs. (1.9 Nm).
Place the instrument panel center sound insulator in position.
Install the screws that attach the center sound insulator to the knee
bolster, instrument panel and the floor duct. Tighten the screws to 17
inch lbs. (1.9 Nm).
Install the screw that attaches the center sound insulator to the heater assembly. Tighten the screw to 13 inch lbs. (1.5 Nm).
Install the remote control door lock receiver module to the instrument panel left side sound insulator.
Attach the door lock receiver electrical connection.
Install the nut that attaches the left side sound insulator to the
accelerator pedal bracket. Tighten the nut to 35 inch lbs. (4 Nm).
Install the screw that attaches the left side sound insulator to cowl panel. Tighten the screw to 13 inch lbs. (1.5 Nm).
Install the screws that attach the left side sound insulator to knee bolster. Tighten the screw to 17 inch lbs. (1.9 Nm).
Feed the DLC through the hole in the sound insulator, place the
DLC in position and install its retaining screws. Tighten the screws to
21 inch lbs. (2.4 Nm).
Install the right side sound insulator and tighten the screws
Connect the parking brake release cable to the lever
Install the heater hoses to the heater core.
Refill the cooling system.
Connect the negative battery cable.
Run the engine to normal operating temperatures; then, check the climate control operation and check for leaks.
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I would check the heater hoses that go into the firewall for your heater core. Seems like they have an issue where they come off of the engine with plastic elbows.
You don’t need to remove the dash or remove AC refrigerant from 2005 Chevy Uplander. Its a simple job takes about an hour with 10 mm socket and Phillips screwdriver. Core is in the center of dash near the floor. Remove lower panels on center of dash where passanger Left leg and driver right leg would be. Also the front lower panel where cigarette lighter is. They pop out. Also remove fiber cover from under glove box and driver area. Remove large black plastic member behind where the lower center panels were. Two black screws in front and seveal screws in either side. Pull to rear to slide out. Remove metal bracket on floor with 4-10mm. Remove vent from floor pops out. Look up underneath from area you created under center of dash. Many vertical gold colored screws. Remove first cover panel 4 screws. Remove second panel mores screws. Theres one clear against firewall by driver side also. After this heater core is accessible held in with only one screw by firewall remove it and core drops out easily after wiggle out pipe ends from firewall holes. This is about 20 minutes to this point
Before remove heater core, drain coolant, remove front engine yoke bolts, ratchet strap engine pull forward and block. Pop out windshield wiper link and brake booster vacuum hose so can reach hose connections from engine side. Remove hose clamps and disconnect hoses to core. One hose is 3/4 id and the other is 5/8” that necks out to 3/4” on other end.
The hardest part about the whole job was getting the hoses off then in with these spiring clamps and finding the right replacement hose and connectors. Not the removal of the core which is surprisingly easy.
I have a chevy uplander and you have to open the passenger door and its on the side of the dash, to the right of the glove box. You will notice a small rounf opening with just enough room for 2 fingers to go in. the whole side will come off when you pull it.
UPLANDER 06 Elec Cont Unit (ECU); (left front of engine compartment), 3.5L. http://cgi.ebay.com/ebaymotors/2006-Chevy-Uplander-Engine-Computer-PCM-ECM-12600928_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1205Q7c66Q3a2Q7c65Q3a12Q7c39Q3a1Q7c240Q3a1318QQ_trksidZp3286Q2ec0Q2em14QQhashZitem320315289651QQitemZ320315289651QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
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