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2007 Chevy Uplander, While at idle the heater blows cold, but while vehicle in motion heater works properly.

Tiny
FSR
  • MEMBER
  • 2007 CHEVROLET UPLANDER
  • 78,000 MILES
The heat can be turned up all the way and while you sit in driveway or idle at a light or in traffic it blows cold, but while you are driving weather its 25 or 50 it blows hot. The coolant is new and full and I see no leaks from hoses or other areas but that dosent mean their not there. I was wondering if it was thermastat or waterpump. Maybe some other bigger problem? Any idea appreciated.
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Tuesday, November 22nd, 2011 AT 4:28 PM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would lean more toward a clogged heater core.
Make sure the coolant level is correct.

Roy
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Tuesday, November 22nd, 2011 AT 4:29 PM
Tiny
CHEVYAM01
  • MEMBER
  • 1 POST
I just took my 2007 Uplander in for the same problem and it found out that the system was air locked. Once they got all the air out of the coolant system, the coolant was able to flow. Now we have HEAT! They also checked the doors inside the duct work to make sure they open and close properly. This can be done with a scanning tool.
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Thursday, December 1st, 2011 AT 5:09 PM
Tiny
WES123
  • MEMBER
  • 1 POST
Had the same issue with our 2007 Uplander. You need nee head gaskets. There is air getting into the cooland system. This all happened to me in the last few weeks. We are also getting a new tanny and rad because coolant leaked into the transmission. Good luck with yours.
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Sunday, February 5th, 2012 AT 12:33 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
It will do that if the water pump impeller is on its way out-
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Sunday, February 5th, 2012 AT 1:30 PM
Tiny
HENRYR79
  • MEMBER
  • 45 POSTS
How do you know if all of the air is out of the system and how do you go about getting it out?
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Monday, October 29th, 2012 AT 1:59 AM

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