2007 - 2013 (GMT900) Section for all discussion related to the 2007-2013 Chevrolet and GMC trucks.

Running hot only when the heat is on

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Old Oct 25, 2017 | 6:05 AM
  #1  
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Default Running hot only when the heat is on

Can any one please tell me why my '11 runs hot only when the heat is on?
Runs fine any other time and with the a/c on.

Just had the water pump, master cylinder, brake booster and heater hose replaced.

Thank you!

Last edited by K.K.; Oct 25, 2017 at 6:20 AM.
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Old Oct 26, 2017 | 8:16 AM
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-idling and driving this occurs?
-can you put a scan tool on it and get some actual coolant temp data...knowing the numbers would be helpful.
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