Heater core problem
Drifting
Joined: Sep 2007
Posts: 1,331
Likes: 148
From: 1000 Islands Ontario
There is a water valve that shuts off coolant flow to the heater core when the a/c is on. The valve may be in the wrong state, and could be your problem.
On older GM cars, the valve was controlled by vacuum - I'm not sure about the C6.
M....
On older GM cars, the valve was controlled by vacuum - I'm not sure about the C6.
M....
6th Gear
Joined: Jan 2011
Posts: 6
Likes: 0
You should ensure that you have plenty of antifreeze in your system and it is on the right level. If that is not your problem then you might have a clogged heater core. If you do not have a clogged heater core,it is possible that your thermostat is sticking and eventually your head gasket will blow. Blown head gasket can be caused by a broken thermostat that stays in the "no flow" position. This in turn can over heat the engine and blow the head gasket.
corvette discussions-heater problems-car repair
corvette discussions-heater problems-car repair
Melting Slicks
Joined: Sep 2005
Posts: 2,670
Likes: 134
From: merritt island fl
C1 of Year Finalist (stock) 2019
2016 C1 of the Year Finalist
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No such valve. The problem most likely is an air flow door actuator problem.
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
Didn't look to see what year your car is but we're seeing more '05's and some '06's with the bad actuators. Just FYI, there are 4 of them in the HVAC system. The dash has to be removed to replace any of them so IF you determine that is your issue and decide to have the one bad one replaced, you should replace all 4 at the same time to save on all the labor money to do another one next year. Good luck.
This is what a bad one looks like, the membrane breaks down and shreds:
