Question about 2004 Pontiac Grand Am
Vaccuum control valve for heater, is stuck or broke. This allows the antifreese to flow through the heater and heat the inside of vehicle. Ccheck vaccuum lines and valve, its by the heater core.
Also, if the antifreese has not been changed, it can clog the heater core not allowing the antifreese to flow. Flush system and check again.
Posted on Dec 12, 2012
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Posted on Jan 02, 2017
Put your heater temperature control in the max position on(this opens the valve for coolant flow through the heater core). Top off the radiator and the coolant resevoir. Make sure the cap is on tight and bring the engine up to operating temperature. Shut off engine, allow to cool, and top off the radiator again. Repeat these steps until you are sure it will not take anymore coolant. Drive the car at speed for 5 or 10 miles and recheck again when cool. It takes awhile to work air out of the system with multiple openings of the thermostat.
Posted on Jan 04, 2010
Probably a clogged heater core. Orange coolant clots after a while. Should be replaced more often than recommended. If you have intermittent heat you might get lucky with a coolant system flush, otherwise you'll probably have to replace the heater core.
Posted on Dec 14, 2008
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