Question about 2006 Pontiac Grand Prix

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When car slows down heat cools down

Heat not as good as it did before I have changed thermostat, had the water pump replaced (NEW NOT REMANED) temp is fine and it heats better when driving but when you slow down the heat cools.

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When you have that problem , almost all the time is the heater core clogged , you can have the engine running until reach normal temperature and touch both heater hoses at the fire wall, if one is hot and the other is not them the problen is your heater core.

Posted on Apr 16, 2014

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Posted on Jan 02, 2017

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SOURCE: 2002 pontiac grand prix over heating

Are your electric fans engaging or turning on?

Posted on Dec 26, 2008

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SOURCE: 2006 pontiac grand prix vary little or no heat

Are you sure you got all the air out of the cooling system? Air pockets are very common problem when you do any work to the cooling system. An air pocket will do what you discribe.

Posted on Mar 18, 2009

dennymulford
  • 1055 Answers

SOURCE: heat fluctuation on temp gauge

change the sending unit to the fan, if that doesnt work check for power too the fan or even a bad fan

Posted on Mar 22, 2009

  • 1348 Answers

SOURCE: Pontiac Grand Am SE running hotter than normal

check the fan switch and make sure the cooling fan is coming on.

Posted on May 22, 2009

jsmes1027
  • 749 Answers

SOURCE: 2004 GTP Grand Prix overheating in slow traffic

Are the cooling fans coming on during normal operation? If your ac works turn it on and see if it overheats with ac on.If it does not overheat the fans are not operating properly under normal operating conditions.The ac will force the fans on. What you can do to start is just let the car idle in park and see if fans will come on normally. The coolant temp should reach 200-210 before the fans will come on. Make sure the air is off at this time. If we can verify the fans are working or not working properly we can go to the next step. Let me know what you find out.

Posted on Oct 08, 2010

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Thermostat?


It actually sounds to me like you're low on coolant. My Jeep leaks coolant and whenever it gets low the temp gauge will go real high and then drop, and the heater doesn't work well. This is because the cooling system of your car is supposed to be a closed system, full of coolant and no air. When coolant leaks out, the space it used to occupy is now occupied by air, which does not transfer heat well. When 'air' is passing through your cooling system, no heat can be transferred from your engine to the heater and radiator, resulting in a hot engine and no heat at the heater. Then when a pocket of water passes through the system, the temperature gauge quickly falls as the water absorbs the heat from the engine. The hot water that cools the engine is where the heater gets it's heat from as well, so when water passes through the heater core, the heater works, but when it's filled with air, it doesn't.

Hot water runs through the heater core regardless of whether or not your thermostat is open or closed. That's why your heater works in the winter even before the engine is at normal operating temperature. The fact that the heater stops working is a good sign that the thermostat is probably not the culprit.

As for the water pump. If the water pump was bad, your temp gauge would go into the red and stay there. Water pumps generally don't work intermittently. Either it's good and ot works, or it's bad and it doesn't.

However, if you are in fact low on water, as I suspect, it means you probably have a leak somewhere. The leak could be in the water pump housing gasket, so depending on where you take it for repairs, they may try to sell you a new water pump anyhow. So just beware of that.

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