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MechanicMan
MechanicMan, Master Auto Tech
Category: Chevy
Satisfied Customers: 895
Experience:  Master Auto Technician 28yrs Electrical and Mechanical experience
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1990 chevrolet cavalier: heater core..an whats the easy way to fix it

Customer Question

I have a 1990 chevrolet cavalier an it needs the heater core changed, how do i change it an where is it located an whats the easy way to fix it?
Submitted: 9 years ago.
Category: Chevy
Expert:  MechanicMan replied 9 years ago.

Hello

Here is the procedure to repair heater core. This one is fairly easy. It is underdash . If you have any questions just ask

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HAPPY HOLIDAYS

1988-94 Vehicles

See Figures 1, 2 and 3

  1. Disconnect the negative battery cable and drain the cooling system.

  2. Raise and support the vehicle safely.

  3. If equipped, remove the rear lateral transaxle strut mount.

  4. Disconnect the drain tube from the heater case.

  5. Detach the heater hoses from the heater core.

  6. Carefully lower the vehicle.

  7. Remove the right and left sound insulators.

  8. Unfasten the steering column opening filler. Disconnect the heater outlet deflector (floor air outlet duct).

Click image to see an enlarged view
Fig. 1: Disconnect the floor air outlet duct

 

  1. Remove the heater core cover.

Click image to see an enlarged view
Fig. 2: Unfasten the retaining bolts, then remove the heater core cover

 

  1. Detach the heater core retaining straps (clamps), then remove the heater core.

Click image to see an enlarged view
Fig. 3: Detach the retaining clamps or straps, then remove the heater core

 

To install:

  1. Install the heater core and retaining straps (clamps).

  2. Install the heater core cover.

  3. Reconnect the heater outlet deflector (floor air outlet duct).

  4. Install the right and left sound insulators. Install the steering column opening filler.

  5. Raise and support the vehicle safely.

  6. Connect the heater hoses (use new heater hose clamps if necessary) to the heater core.

  7. Connect the drain tube to heater case.

  8. Connect the rear lateral transaxle strut mount, if equipped.

  9. Lower the vehicle.

  10. Fill the cooling system and check for leaks. Check heater system for proper operation.

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