Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET1999PICKUP K1500, 5.7 RREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 449 (HEATING, VENTILATION AND AIR CONDITIONING)REPAIR INSTRUCTIONSHVAC MODULE ASSEMBLY REPLACEMENTREMOVAL PROCEDURE

1999 Chevrolet Pickup K1500, 5.7 R

Removal Procedure

1999 Chevrolet Pickup K1500, 5.7 RSECTION Removal Procedure

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

Recover the refrigerant from the A/C system. Refer to REFRIGERANT RECOVERY AND RECHARGING .
Drain the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM .
Remove the wiper motor module assembly. Refer to WIPER MOTOR MODULE REPLACEMENT .
Important: The defroster door must be closed to allow clearance during defroster duct removal.

Fig 1: Removing HVAC Module Assembly
Courtesy of GENERAL MOTORS CORP.
Set the HVAC controls in the vent setting to close the defroster door.
Remove the blower motor. Refer to BLOWER MOTOR REPLACEMENT .
Disconnect the electrical connector from the blower motor resistor.
Disconnect the electrical connector from the evaporator temperature sensor.
Disconnect all of the HVAC electrical actuator connectors.
Remove the I/P carrier. Refer to INSTRUMENT PANEL (I/P) CARRIER REPLACEMENT .

Fig 2: Disconnecting Electrical Connector From Blower Motor Resistor.
Courtesy of GENERAL MOTORS CORP.
Remove the evaporator outlet tube nut.
Disconnect the evaporator outlet and inlet tubes from the TXV.

Fig 3: Removing Evaporator Outlet Tube Nut
Courtesy of GENERAL MOTORS CORP.
Disconnect the heater inlet hose from the heater core. Refer to HEATER HOSE REPLACEMENT - INLET .
Disconnect the heater outlet hose from the heater core. Refer to HEATER HOSE REPLACEMENT - OUTLET .
Remove the HVAC module to dash panel sound barrier nuts.
Remove the HVAC module assembly from the cowl.

Fig 4: Disconnecting Heater Inlet Hose From Heater Core
Courtesy of GENERAL MOTORS CORP.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.