MY CAR WILL HEAT UP AND BLOW OUT HOT AIR FOR A ...

  • Tiny
  • Anonymous
  • 2003 Pontiac Grand Prix
  • 135,000 miles

My car will heat up and blow out hot air for a minute or two then all of a sudden it will blow out cold. If I play with the temp controls sometime it will blow out hot again. It switches instantly from hot to cold and cold to hot. Any ideas?

Wednesday, November 7th, 2012 AT 12:28 PM

1 Answer

  • Tiny
  • hmac300
  • Expert
  • 41,621 posts

Check to make sure coolant is full first. Check for a vacuum leak from engine to heater, and checkt items 1 & 6 on heater.

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Wednesday, November 7th, 2012 AT 2:03 PM

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