The heater core is an essential component of the A/C system in your Chevrolet vehicle. The heater core is the device that warms up the air before it is blown into the interior compartment of your Chevy. If the heater core begins to malfunction, you should replace it as soon as possible. The replacement process can take a long time as it requires the removal of various other components, but it is fairly straightforward.
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Things you need
- Socket wrench
- Slotted screwdriver
- Phillips screwdriver
Open your Chevy's bonnet and disconnect the battery's negative terminal with a socket wrench.
Place a drain-pan underneath the radiator drain plug and loosen the plug to drain the cooling system. Tighten the plug once the all of the coolant has drained.
Open the glove box and press in on its side tabs to release it from the dashboard. Remove the glove box from the dashboard.
Pull out the central-air distribution duct from the floor.
Pry off the hinge pillar trim panel on the passenger's side of the vehicle with a slotted screwdriver.
Use a Phillips screwdriver to uninstall the screws from the blower motor cover and pry off the cover. Remove the screws from the blower motor and remove it as well.
Pull out the coolant overflow tank from underneath the right side of the dashboard.
Remove the screws and nuts from the heater core case. Remove the seven screws from the heater case cover and pull off the cover to reveal the heater core itself.
Remove all of the fasteners and brackets securing the heater core to the vehicle and pull it out of your Chevy. Install a replacement heater core and reattach all the fasteners and brackets.
Reattach the heater core cover and the heater core case. Reattach the coolant overflow tank and the blower motor.
Snap on the hinge pillar trim panel and reattach the central-air distribution duct. Reattach the glove box.
Remove the radiator cap and pour the coolant from the drain-pan into the radiator. Secure the cap and reconnect the negative terminal to the battery. Close the bonnet.
Tips and warnings
- A faulty heater core can cause smoke or coolant to drip out into the interior compartment of your Chevy vehicle.
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- "Chilton's Repair Manual: Chevrolet S-10, GMC S-15 1982-1991"; Chilton; 1991
- "General Motors: Chevrolet Malibu (1997 through 2003) Oldsmobile Alero (1999 through 2003) Oldsmobile Cutlass (1997-2000) Pontaic Grand Am (1999 through 2003) Haynes Repair Manual"; Jay Stoner; 2005
- "General Motors Full-Size Trucks 1988-1998 Repair Manual: Chevrolet/GMC Pick-Ups, Sierra, Blazer, Tahoe, Yukon and Suburban"; Chilton Automotive Books; 1998