Engine overheats at idle

2009 PONTIAC TORRENT
150,000 MILES • 6.3L • 6 CYL • 4WD • AUTOMATIC
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SROHDE1
  • MEMBER
  • 1 POST
My vehicle blows lukewarm air at idle but heats up nicely when revved or driving. Then I noticed the temperature gauge heats up to the red area after idling and drops down when I give it gas. The fans are working fine, and I flushed the heater core with no change. Fine while revving/driving. No cabin heat at idle.
Feb 2, 2018 at 9:57 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,548 POSTS
Hello,

This sounds like you have a coolant pump impeller that has fallen apart not circulating engine coolant like it should. Here is a guide to help you see what you are in for when changing the pump out:
https://www.2carpros.com/articles/water-pump-replacement

Here is how it will be for your car (below).

Check out the diagrams.

Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken
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Feb 5, 2018 at 3:36 AM
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