Question about 1997 Pontiac Grand Am

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Heater core blowing cold and leaking coolant

I started my car today and added coolant then i let it warm up about 5 min then the air was still blowing cold and all the coolant that i added was on the ground.....now is there a way to bypass the heater core in order to retain coolant? if so can you send me a few diagrams?

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  • Pontiac Master
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Locating the connections from the engine compartment to the heater core shouldn't require a diagram.
Check the hoses and their paths and you will find two that go through the firewall via a fixed connector; these are the in- and outlet for hot water circulation. Since the hoses have had a dozen years to weld themselves to the fitting, they probably won't be easy to remove; it may be necessary to **** them with a razor blade and pry the hose from the fitting.
If you have a little junk pipe pieces at home, either 1/2 or 3/4 should be a fit to couple these two ends together after they are removed from the connectors that you'll find at the firewall. 

Posted on Feb 28, 2009

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My car is not heating properly lately. It blows warm and then completely cold while I'm driving it. I put coolant in just now and it blew very warm for about 5 min. then it turned to cold completely.


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2002 taurus, power windows all stopped working at once along with lighted window switches. Drivers window stuck down. Relay was hot! Also heater blows cool air, started doing this after I added radiator...


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But since you state that the Heater Hoses do not get warm that is indicative of an Air Lock in the Heater Core. This is a relatively simple fix. It is best performed COLD but requires a method of pressurizing the Cooling System. All reputable Auto Parts stores Sell and/or Rent Pumps that temporarily replace the Radiator Pressure Cap for Leak tests and curing Air Lock. The Collant Level must be filled FULL then pressurized and then loosening the Highest Heater Hose at the Firewall so that Air and a Small Amount of Coolant escapes. Once all the Air has escaped tighten the Heater Hose Clamp, remove the Pressure Pump, Restore the Collant Level to FULL, re-install the Pressure Cap and Start the Engine. As it Warms up you should be able to feel coolant running through the Heater Hoses and they should become warm.

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First you have to identify what causes the problem.
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2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is worm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest to flush the heater core.

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1 Answer

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First you have to identify what causes the problem.
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2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.

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