Question about 2005 Pontiac Grand Prix

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We have a 2005 Grang prix and the heater will not but out much heat. We checked the coolent and it is full

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Open the hood and with the heater running(be careful PLEASE), feel the lines going to the heater core(2 hoses running to the firewall, to the blower motor). Is one of them hot? If both are cool, your relay valve to allow coolant to the heater core is stuck. It will have to be replaced. Is the blower fan running( that's the fan in front of the firewall)? If the valve opens but no fan running, you will not get hardly any heat. If all that is working, You have a problem with the vent control valve(that will open the hose duct to allow heat to go through the vents). It works off of vacuum. A hose may have broken (they are made of rubber), or it may be just stuck. Check these first, before looking at the heater core. I hope this helps you

Posted on Dec 30, 2010

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if the tempature gauge reads normal warm the vehicle up and feel the heater hoses wich are located on the right side of the vehicle if one is alot warmer than the other you probaly have a plugged heater core remove the hoses and take the hoses off and run a hose through one of the hoses until it comes out clear. it could also be just low coolant and topping off the coolant could solve this problem temporaily but if it is low it is leaking.

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Hey guys, i am no mechanic not even close, but my pontiac grand prix se 4-dr automatic with 6cyl, has been acting strange when i first start it and drive it maybe 30 min the low coolent light comes on and...


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your either low on coolant or the heater core is restricted, check your coolant level in the resovoir while it is running and if it is full feel the heater hoses runing into the fire wall they should both be pretty hot if the vehicle is at normal operating temperature, if one hose is much hotter than the other, almost cold, at an idle then the heater core is clogged. SOMETIMES you can switch the two hoses around by removing the quick disconnects and just install them with hose clamps and reverse the direction of the coolant flow through the heater core causing the blockage to be pushed out from the heater core but replacing it would be the suggested method

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I live in Alaska and have had the same problem i just added more coolent to the radiator and it warmed up i installed a block heater and i leaked a bit and the coolent level got low and i would have no heat. I tryed to fill just the coolent resivoir and that dident work so i filled the radiator pumb full and that worked!! Hope this helps.

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