Question about 2006 Pontiac Grand Prix

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No over heating and heater core was replaced last winter and so was thermostat

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If there is no coolant loss, perhaps you could replace your cabin air filter.Save youself sum money(cheap solutions first).

Posted on Dec 22, 2012


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Posted on Jan 02, 2017

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SOURCE: Heater problems

Have you tried checking the coolant lines going into your heater core to see if there restricted, it could also be a bad water pump, or a worn or loose drive belt. It sounds like you have poor coolant flow goiing through your system. You might want to also check your coolant reservoir cap to see if it is maintaining the proper pressure. Good luck.

Posted on Mar 12, 2009

SOURCE: 02 grand prix temp rises over 210 then drops back down. heater

dear friend-there is a couple of things you can do to find the problem,when the engine is cold remove the radiator cap start the engine then look inside to see if the water is circulating,all so look for bubbles in the water,if there is bubbles,you might have a blown head gasket,if there is circulation the water pump is ok,then get the engine up to working temp,then feel both the top and bottom radiator they should be the same temp,if not then the termostat is at fault

Posted on Nov 04, 2009

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SOURCE: I have no heat. We have changed the thermostat

You can test your environmental station doors by using the a/c, just change the location of air, by selecting different vent locations, does it go to all locations selected? if not then you have a problem with the control switch or the vacuum doors operated by that switch. The most common door problem is the blend door, it blocks of the heater core for a/c, and opens to allow heat in the vehicle. Your heater core can be clogged, feel the hoses attached to it under the hood while the engine is warm, are they hot? if not the core could be clogged. As far as valves in the heater core lines, look at the lines themselves follow them from the fire wall to the engine connection points, if you see a valve then it may be closed, more than likely you do not have any valves in the system. What is your engine temperature? If it is staying on the cold side on your gauge, then your thermostat maybe stuck in the open position, which will only allow the engine to get to a temperature of about 120 degrees, not enough for heat, I know you put in a new one but if the guage is not showing normal temp then it may not be good. Hope this helps, let me know.

Posted on Dec 11, 2009

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SOURCE: Heater not working

Hello keefer.
If indeed your cooling system is full, one of the next two problems will likely be it.
First of all the heater core may not be leaking but plugged up on the inside.
Over time deposits form inside and restrict the flow of coolant through the core.
To check these I use an electronic temperature tool and measure the temperature in and out of the heater core when the engine is fully warmed. Only a minimal difference in temperature is acceptable, 2 or 3 degrees.
These hoses go through the firewall and are a little over an inch in diameter and from 3 to 5 inches apart.
If there is a big temperature difference you will need to flush it out or replace it.
Next issue will be the heater blend door.
Your temp dial on the dash is like a volume control on a radio, turn it up and it sends an electronic signal to a motor that turns a door in the heater box. This is called a blend door.
I have seen a few of these blend door motors become defective but you will want to verify it first, because they can be pricey.
Also in some vehicles I have found toys, coins and other such things jam up the door.

If you have further questions leave them in add comments and I will check back.


Posted on Jan 02, 2010

Testimonial: "Thanks! I think you're right about clog coolant had alot of silt in it because the car sat for a long period of time before I bought it. "

SOURCE: 1996 sunfire overheating replaced thermostat,

Does the top rubber engine to radiator hoes get hot? If yes then the new thermostat is working. Does the bottom return hose from the radiator back to the engine also get hot? If yes then the pump is OK. If not then there is a blockage in the system and this will need to be flushed out from both the radiator and the engine block using a high pressure hose. Does the radiator fan come on promptly. It should start before the bottom return hose becomes hot. If not then the temperature sensor (different from the temperature sender to the dash display) maybe at fault. Your relay maybe fine but it is the sensor that actually triggers the fan to come on. It may be just bad connection so try wiggling the wires to it when the engine has got warm. The temperature sensor is also important to let the engine computer management system (ECU)know that the engine has reached operating temperature. A failed sensor not only allows overheating but means that the ECU thinks the engine is still cold and runs the engine on a rich mix. Have you noticed lumpy idling when hot and excessive fuel consumption recently? these are symptomatic of a failing sensor.

Posted on Jul 13, 2010

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