I have a 2007 Pontiac Grand Prix. The heat is not blowing hot. I had the whole system flushed in November, and that worked, but is there something I can to do 1. avoid this happening every 2 months, and 2. flush it myself?


Asked by Jan 03, 2014 at 09:23 AM about the 2007 Pontiac Grand Prix GT

Question type: Maintenance & Repair

3 Answers

Norm Davis

Most auto supply shops have a flush kit you can buy that will let you do this very inexpensively. The question is, why it needs to be flushed every two months, that's not normal. If you're radiator and heater core are filling up with corrosion or grit, you've got the wrong antifreeze or a pump failure on the way.


does it need flushed or does it have an air bubble in it? Is the coolant full of crud?


Mid to late 2000s GM products tends to have problems related to the HVAC system in which the dampers (valves which control the air flow) tend to freeze in place. From personal experience I have had them freeze totally or partially closed positions before. This would prevent you from being able to control the direction of airflow (head, feet, defroster, etc...) and or heating/cooling ability of your vehicle. Good news is the fix is simple. With most GM cars (Grand Prix is one) a lot of the computer inputs are done through the radio. Resetting the dampers should fix the problem. All that needs to be done is to hold in a specific combination of buttons on the radio to preform a damper cycle and reset. Just give a call to your local GM service department and they should be able to provide you with the correct combination of buttons to preform the reset. Hope this is helpful. Chris Business Consultant Vehicle Information Resources LLC Owner of a 2006 Pontiac Grand Prix GT

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