Question about 1991 Chevrolet Cavalier

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Need to replace heater core. 91 Cavalier RS, 4 cyl., 2 litre

Need to replace heater core. Where is it located and how to get to it.

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  1. Drain the cooling system. Refer to Draining and Filling Cooling System in Cooling System.
  2. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging.
  3. Remove the bolt connecting evaporator lines to evaporator.
  4. Remove the evaporator lines from the evaporator.
  5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  6. Disconnect the heater hoses from the heater core.
  7. Lower the vehicle.
  8. Remove the evaporator case drain tube.
  9. Remove the inside and outside module attaching bolts and the accumulator mounting bracket bolt.
  10. Remove the IP carrier.
  11. Remove the floor air outlet.
  12. Disconnect the wiring harness from the HVAC module assembly
  13. Disconnect the electrical connections at the following locations:
  1. Remove the HVAC module assembly screw (2) at the top of the module from the mounting bracket. (1).
  2. Disconnect the gray source vacuum line (1). IMPORTANT: DO NOT tilt HVAC module assembly or coolant may leak out.
  3. Remove MODULE from Vehicle

Posted on Jul 28, 2009

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If you need to replace the heater core it's really easy. Maybe 30 mins if you know what your doing. Remove the hoses (truck cold) from the heater core in the engine compartment (reclaim excess coolant that comes out). Remove screws from the passenger compartment fire wall area (inside), remove and reinstall heather core. Replace lost coolant. It's that simple.

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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.
f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
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