Question about Pontiac Grand Prix
There is an inlet and outlet rubber hose going to your heater core. At operating temp the 2 hoses should be the same hot temp, if not, swap them making the inlet the outlet vise/versa and see if it makes a difference. Run vehicle like that a few days and this will make sure the core is unplugged. If this does not work there is a thermal relay in the blower compartment that may be faulty. To get at that you pull out the fan blower under dash and it will be right next to it. You may need to access the mounting screws for it through the hood and air sytem filter. I will put my money on a plugged core, even though it was flushed!!
Posted on Nov 07, 2010
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Posted on Jan 02, 2017
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