Top 10 1994 GMC Sierra Questions & Answers

the injectors are fired thru the engine cotrol module but it gets its signal to fire from the pick-up located inside the distributor if you are loosing injector pulse only the ignition module is bad if you are also loosing spark when you loose injector pulse your pick up is causing the problem if you replace the pick-up i recomend you change the ignition module when doing so because they work together and you have to remove the distributor to change the pick-up

if your o2 sensor is reading too lean then you have a vacume leak spray brake cleaner on all your vacume hoses one at a time if nothing then spray it around your intake manifold gasket they are usually the culprit

GM Full-Size Trucks 1988-1998 Repair Information
Blower Motor - REMOVAL & INSTALLATION

Front
Without Air Conditioning
(see Figure 1)

1. Disconnect the negative battery terminal.
2. Mark the position of the blower motor in relation to its case.
3. Unplug the electrical connection at the motor.
4. Remove the blower attaching screws and remove the assembly. Pry gently on the flange if the sealer sticks.

Fig. 1: Blower motor wiring

1. The blower wheel can be removed from the motor shaft by unfastening the nut at the center.

To install:

1. Install the blower wheel to the motor shaft and tighten the nut at the center.
2. Apply a bead of sealer to the blower mounting flange. Position the blower so that the marks are aligned and install the screws.
3. Attach the electrical connection at the motor.
4. Connect the negative battery terminal.

1991-98 C/K With Air Conditioning

1. Disconnect the negative battery cable.
2. Remove the instrument panel compartment.
3. Unfasten the forward-most screw in the right side door sill plate. Remove the trim panel from the right hinge pillar.
4. If necessary for access, unplug the ECM wiring and remove the ECM.
5. Unplug the electrical lead at the blower motor and if equipped, remove the underdash courtesy lamp.
6. Remove the bolt from the right side lower instrument panel support. Remove the blower cover and the cooling tube.
7. Unfasten the flange screws and pull out the blower motor. You may have to pry back the right side of the instrument panel slightly. Be careful!
   

To install:

1. Position the blower motor and install the mounting screws. Be careful not to catch the blower on anything when sliding it in.
2. Install the cooling tube and the blower shield.
3. Install the bolt into the instrument panel support.
4. Attach the courtesy lamp and the blower electrical lead.
5. If removed, install the ECM. Attach the wiring harness.
6. Install the trim panel on the pillar. Don't forget the screw in the sill plate!
7. Install the instrument panel compartment and connect the battery cable.

Rear
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 help (remember comment and rated this).

The filter is located on the inside of the drivers side frame rail around the area of the drivers door.

your instructions are on how to replace the condenser on a 1994 gmc sierra but the title says it is the directions for replacing an evaporator. please correct your title.

Not sure of your engine size so please pick the appropriate diagram:

Coolant temperature and oil pressure senders-4.3L engines

Coolant temperature and oil pressure senders-5.0L and 5.7L engines

Coolant temperature and oil pressure senders-7.4L engines

Coolant temperature and oil pressure senders-6.2L and 6.5L diesel engines

engine compartment relay box. There is also a horn relay there.

Please see my tip at http://www.fixya.com/cars/r6022358-relay_check to check the relay and socket. These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Inspect/Replace If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing

• The heater housing is usually under the dash and must be removed to gain access to the heater core.
• Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.

The heater housing is disassembled to get to the heater core. Heater Core

• Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
• Remove the heater coolant hoses.
• Remove the cable and/or vacuum control lines (if equipped).
• Remove the heater core securing brackets and/or clamps.
• Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
• To reinstall the heater core, reverse the removal steps.

When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

OBD1 fault Code 32 means that the EGR valve is either not working or the gas passages in the intake that deliver the exhaust gases from the EGR are plugged with carbon and sludge, this is one of the most common causes of a GM OBD1 fault code 32. Remove the EGR and see if you can blow compressed air through the gas passages under the valve, I will bet one of the two or both are plugged up.

You can\'t. GM did away with timing light based ignition timing on the vortec engine family. You can adjust the distributor, but it adjusts something called Camshaft Retard Offset, and can only be read using a scan tool. The only reason you would need to check the camshaft retard offset is if you removed the distributor or intake manifold and accidentally got the distributor off a tooth or two.