Heater System Chevrolet Chevy Van G3500

DESCRIPTION

SYSTEM DESCRIPTION

System blends heated outside air with cooler outside air to obtain desired temperature. Major components of the system are blower motor, air inlet assembly, heater air distributor assembly, and heater control panel.

AUXILIARY HEATER BLOWER SWITCH

A 3-speed blower switch (if equipped) is located on instrument panel, to right of steering column. When switch is in OFF position, auxiliary system does not operate.

BLOWER SPEED SWITCH

The blower speed switch selects low, medium-low, medium-high or high blower speed.

MODE SELECTOR

The mode selector directs discharge air to windshield, floor, or dash outputs, as desired by driver.

TEMPERATURE CONTROL SELECTOR

The temperature control lever or knob controls discharge air temperature in all mode positions. Full hot position provides maximum heat. Full cold position provides unheated air.

VENT Mode

Air is directed to instrument panel outlets.

BI-LEV Mode

Air is directed to instrument panel and floor outlets. A slight amount of air is directed to defroster and side window defogger outlets.

HEAT Mode

Air is diverted to floor outlets to heat passenger compartment. A slight amount of air is directed to windshield and side window defogger outlets.

BLEND Mode

Air is divided between instrument panel and floor outlets, with a slight amount of air going to defroster outlets.

DEF Mode

Air is directed to windshield defroster outlets. A slight amount of air is diverted to floor outlets and side window defogger outlets.

Temperature Control Lever

Attach cable core wire and cable housing to control panel. Set temperature control lever to cold position. Attach loop on cable core wire to temperature door on heater case. Attach cable housing to heater/defroster assembly. To adjust cable, set temperature control lever to full hot position.

TROUBLE SHOOTING

Note. For Heater System trouble shooting information, see the HEATER SYSTEM TROUBLE SHOOTING article. For front (and rear) blower motor trouble shooting information, see the A/C-HEATER SYSTEM - MANUAL article.

REMOVAL & INSTALLATION

Disconnect negative battery cable. Unplug blower motor connector. Remove screws and blower motor. To install, reverse removal procedure.

1. Disconnect negative battery cable. Remove instrument panel bezel. Remove control assembly screws. Pull control assembly away from instrument panel.
2. Disconnect control cables. Unplug blower switch connector. Remove control assembly. Remove blower switch knob and retaining clip. Remove blower switch. To install, reverse removal procedure.

HEATER CORE

Removal

1. Drain the engine coolant.
2. Recover the refrigerant, if equipped with A/C.
3. Remove the coolant recovery reservoir or the surge tank.
4. Remove the battery from the vehicle.
5. Remove the A/C accumulator.
6. Disconnect the heater hoses from the heater core.
7. Remove the right kick panel.
8. Remove the right knee bolster.
9. Remove the outer floor air outlet duct.
10. Remove the retaining screws from the heater case.
11. CAREFULLY open the heater core access door in order to obtain the retainers.
12. Remove the retainers from the heater core. Remove the heater core from the vehicle.

Scheme 1

Installation

1. Install the heater core to the vehicle. Install the retainers to the heater core.
2. CAREFULLY close the heater core access door.
3. Install the retaining screws into the heater case.
4. Install the outer floor air outlet duct.
5. Install the right knee bolster.
6. Install the right kick panel.
7. Connect the heater hoses to the heater core.
8. Install the A/C accumulator.
9. Install the battery into the vehicle.
10. Install the coolant recovery reservoir or the surge tank.
11. Charge the A/C system, if equipped with A/C.
12. Fill the engine coolant.

1. Disconnect negative battery cable. Remove instrument panel bezel. Remove control assembly. Raise or lower control assembly as necessary to remove cable push nuts and tab screws.
2. Disconnect cables from control assembly. Remove clip. Disconnect cables from heater. To install, reverse removal procedure. Check cable operation. Adjust cables as necessary. See «ADJUSTMENTS»(/chevrolet/chevy-van-g3500/1996-1998/remont/heater/#heater-system) .

Disconnect negative battery cable. Heater assembly is located on left side of vehicle, forward of left rear tire. Remove cover screws and cover. Unplug connector(s) from blower motor. Remove blower motor. To install, reverse removal procedure.

Disconnect negative battery cable. Remove control assembly screws. Pull control assembly away from instrument panel. Unplug electrical connector. Remove control switch. To install, reverse removal procedure.

1. Disconnect negative battery cable. Drain engine coolant. Heater is located on left side of vehicle, in rear corner. Disconnect heater hoses from heater core. (Scheme 2) Remove stud from case. Remove case cover. Unplug connectors from blower motor and resistor.
2. Remove heater case from vehicle. Separate blower motor plate from heater case. Remove heater core seal, mounting strap screws, and mounting straps. Remove heater core. To install, reverse removal procedure. Fill cooling system. Start engine and check for leaks.

Scheme 2

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

See also:
• ADJUSTMENTS