Question about 1999 Pontiac Sunfire

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1999 pontiac sunfire over heats vents blowing cold air

Replaced thermostat, water pump,hoses,fan works great,any ideas?

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  • yadayada
    yadayada May 11, 2010

    has it been tested for a blown head gasket.

  • Anonymous Mar 18, 2014

    Pontiac sunfire lower heater hose is cold

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  • 188 Answers

Take the inlet & outlet hose off of the lines feeding your heater coil, where it come off the motor. Do you have good pressure on your water supply to your house????? If Yes. Flush the water thru the heater hose backwards from the diterction that the water normly flows from your car motor. Alot ot the time your heater core will just be plugged up and need to be backflushed. Also make sure that you do not have trash/ leaves in your heater box?????
You can also later on after flushing the H-core out, you can flush your motor, radiator & heater coil by dropping everything out and add water plus 1-can of old style Comett. This is very abrassive!!!! Run the motor for about 1-hour. Then drop all of it out. Put just water back into the system and run again about 10-minutes.Do this flushing about 3-times. You will see how clean your radiator will be, plus the cooler your motor will run.

Posted on Feb 03, 2009

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1 Answer

Changed water pump, thermostat and still over heating fan does work


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