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Discussion Starter · #1 ·
It’s getting cold in the northeast and the heat in my 2011 armada platinum decided to work intermittently. I have searched all over and I cannot find a fix and I would greatly appreciate any help/advice.
I have replaced the heat check valve and it did not solve the problem. I confirmed the valve is working (both hoses get hot). I checked the actuator under the glove box and it is functioning when the heat is working properly (I have not been able to check when heat is not working)

what else could possibly cause the problem, when I raise the heater temp the air flow drastically decreases and the cabin will never warm up. Other times I raise the heater temp the air flow doesn’t decrease and cabin heats fine. All vents decrease in air flow when the problem occurs.
Is there a master blend door in addition to the driver and passenger ones?

thank you for your help,
Chris
 
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