Either the linkage from the temp control unit to the valve on the heater core (which is behind the radio and temp controls) or it is the heater core itself.
Replacing A Chevy Cavalier Heater Core Q. I have a 1997 Chevy Cavalier, automatic, 4 cylinder with A/C, floor shift console, 4 door sedan that I need to replace the heater core. I need instructions or pictures of how to dismantle the dashboard to install this. Any help you could give me would be greatly appreciated. Thanks, Rick Replacing A Chevy Cavalier Heater Core A. Well, the first thing you have to do is take out the instrument panel. Replacing A Chevy Cavalier Heater Core Remove or Disconnect 1. Negative battery cable. 2. Instrument panel. 3. Drain cooling system. 4. Raise vehicle. 5. Heater hoses from heater core. 6. Lower vehicle. 7. Heater core outlet. 8. Heater core cover. 9. There is a mounting screw located in a recess in the center of the cover. 10. Heater core mounting clamps and heater core. Install or Connect 1. Heater core and heater core mounting clamps. 2. Heater core cover. 3. Heater core outlet. 4. Raise vehicle. 5. Heater hoses to heater core. 6. Lower vehicle. 7. Fill cooling system and check for leaks. 8. Instrument panel. 9. Negative battery cable. Replacing A Chevy Cavalier Heater Core 1. Valve Housing Cover 2. Heater/Blower Module Bolt 3. Defroster Valve 4. Mode Valve 5. Heater-Vacuum Tank 6. Heater Module Mounting Bracket 7. Heater-Control 8. Heater Valve Lever Link 9. Defroster Valve Actuator 10. Heater Case 11. Heater Valve 12. Mode Valve Actuator 13. Temperature Valve Clip 14. Temperature Valve 15. Heater Core Shroud 16. Heater Core 17. Heater Core Strap 18. Heater Cover 19. Heater Outlet 20. Heater Core Shroud Seal 21. Heater Core Tube And Mount Seal 22. Heater Core Seal 23. Heater And A/C Control Switch Harness 24. Defroster Duct 25. Blower Motor Bolts 26. Blower Motor Isolator 27. Blower Motor 28. Blower Fan 29. Blower Resistor 30. Heater Case Seal 31. Blower And Air Inlet Case 32. Mounting Seal 33. Air Inlet Housing 34. Vacuum Harness http://autorepair.about.com/library/faqs/bl503f.htm
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