Heater not working

[Can007]

Hello, My heater is no longer working and blows cold air. No leaking from the heater core and my temp is slightly below 3/4th. I have installed transmission cooler as well as pusher fans over the summer. I was wondering if any of you have experience this before?

 

[rascole]

Did you get the recall notice from GM to get the wiring harness for the HVAC fixed? If not, check with your local Chevy or GMC dealer so they can check for you.

 

[4speedfunk]

Air bubble in the cooling system? Very common, especially if you have recently drained & refilled it for repairs.

GM recommends using a vacuum purge/fill system but sometimes you can get the air out by parking it nose up on a very steep incline.


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[alrock]

I'm going with 4speed on this one.

 

[08H3]

I also agree. You don't need any special tools for a drain and fill, but you do need patience. It does take time to get all the air out.

 

[alrock]

Don't need it, but that vacuum fill tool sure does make things easy!

 

[Can007]

Do you have a link to for the tool? Don't know what that is.

 

[4speedfunk]

It’s basically a radiator cap with a small hose fitting on it, and a small valve manifold. You pull a vacuum on the system, then route a 1/4” hose from the manifold into a jug of your favorite antifreeze. Open a valve on the manifold and the new juice gets sucked into the system by the vacuum. Very similar to charging an AC system.

https://www.amazon.com/Radiator-Cooling-System-Vacuum-Refill/dp/B0081N522E


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