Question about 2004 Pontiac Grand Am

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I get no heat out of the heater. Coolant level is ok. Thermostat has been replaced recently. Is there a heater control valve to direct hot coolant to the heater core?

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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

  • mlw2720
    mlw2720 Dec 14, 2012

    Not sure how much of the dash I have to remove to get to the valve and core. May have to visit dealer.

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Posted on Jan 02, 2017

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SOURCE: Im getting no heat in my 1999 Pontiac Grand Am, I

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

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SOURCE: heater does not work and car is overheating

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

  • 83 Answers

SOURCE: location of heater control valve 2005 grand prix

i don`t think there is a heater control valve.you may have an air pocket in system.

Posted on Jan 06, 2009

ndguy2481
  • 251 Answers

SOURCE: 2000 pontiac montana is not blowing hot air.

it seems to be the only thing left would be the heater core replace that and see if that works here to help Shaun

Posted on Nov 16, 2008

james klgr
  • 362 Answers

SOURCE: 2002 montana getting overheated

sounds like a stuck thermostat. but check if the system has a bleeder screw if it does burp it and that will help also.

Posted on Dec 13, 2008

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I changed the thermostat but it still does not heat up what else could be wrong


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Check operation of the heater coolant on/off control valve and operating mechanism.
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Would the heater control valve malfunctioning make the engine overheat blowing hot air out the heater one moment,then not blowing the hot air, temp gage spikes 225 plus. The motor takes awhile to heat up...


Heater control valve malfunction will not cause engine to overheat unless coolant is leaking externally...Overheating going down the road can be the result of a few different things...Partly clogged radiator...Insufficient air flow due to possible fan problem...External coolant leak...Make sure fans are operting properly and have cooling system pressure tested for leaks...Gaining and losing heat on the inside of the vehicle usually means system is low on coolant but you must find out where coolant is going

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