Question about 1994 Mercedes-Benz C-Class

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I've got the same problem wid my car...

I had changed my heater PCB unit.. but doesnt seem to work.. could anyone advice on this please..

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Please check the heater valve in the engine's hot water hoses! may be its stuck! replace it or check the motor that controls the heat exchange! just below the instruments panel! may be it is not working as well!

Posted on Jun 16, 2009

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1. Chock wheels. 2. Drain the engine coolant. Refer to Engine Cooling System. 3. Discharge and recover the refrigerant from the A/C system. Refer to Recovery/Evacuating/Charging in this section. 4. Remove the dash panel. Refer to Body. 5. Remove the Blower/Evaporator unit. Refer to Blower/Evaporator Unit in this section. 6. Disconnect the low pressure line from the evaporator outlet on the bulkhead. 7. Disconnect the high pressure line from the evaporator inlet on the bulkhead. 8. Disconnect the heater return hose from the heater core outlet tube connection. 9. Disconnect the heater inlet hose from the heater core inlet tube connection. 10. Disconnect the fresh air/recirculation control cable from the blower housing unit inlet duct. 11. Disconnect five connectors at the bottom of the blower housing unit. 12. Pull carpeting away from bulkhead to gain access to the hole cover plate. 13. Remove the four nuts retaining the hole cover plate. 14. Remove the hole cover plate. 15. Remove two mounting bolts at the top of the blower housing unit. d40e96a.jpg 16. Remove two nuts attaching the bottom of the blower housing unit to the bulkhead mounting studs. 17. Remove the blower unit from the vehicle. 18. Remove the temperature control cable from the heater unit servo. 19. Remove the two nuts from the mounting studs at the bottom of the heater unit. 20. Remove the top nut holding the heater unit to the bulkhead to the bulkhead mounting stud. 21. Remove the heater unit. Regards, Jeep Brainy

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2005 Grand Prix GT


There is a heater resistor module, it is located on the passenger side under the dash by the blower motor. It is a bit tricky to get to but isnt to hard to replace. I just dealt with this issue in May. The unit cost me about 86 dollars from the dealer. But be careful becuase normally the resistor goes due to a short in another component in the syste, so this may not be the complete fix for you. My main culprit ended up being the blower motor.

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