Question about 2005 Pontiac Grand Prix

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Location of heater control valve 2005 grand prix

I have no heat.I changed thermastat and topped off the coolant level.Still no heat.Autozone.com suggests heater control valve.I have no idea where it is.

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

Posted on Jan 06, 2009

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I have a 2005 grand prix gt temp guage reads normal and heat is on and warm when start driving heat gets colder or if i change to defrost its cold air doeasnt stay hot car doesnt over heat though changed...


The heating coil is probably getting plugged up. You may have heat at idle or slow speeds, but once you get going, there is not enough coolant going through it to stay warm. Get the system flushed or replace the heating coil.

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No heat in car ,new coolant ,new thermostat


Had the same problem and turned out to be that the Heater Core was clogged. Took it to a Radiator shop and they blew the system out to unclog it. Cost was $25.00. 2005 Grand Prix.

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I have a 1998 Dodge Dakota 5.2/ V8 4X4 and was told the Firestone service Rep that my water pump and thermastat were defective. I could smell coolant both outside and inside the truck. Also when the heater...


If the heater core isn't leaking it doesn't likely need changing. It sounds like you could have a problem with the heater control valve - a valve in one of the heater hoses that controls flow through the hose. If you smell coolant and see moisture on your windshield (inside) or have coolant leaking onto the floor - you might need the heater core replaced.

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Make sure you have enough coolant.

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