you have given very good feed back. The tempature of the engine is good. I have driven it all summer like that. The defrost never has any heat from it and I'm really thinking it's going to be the dual control value. The only other thing I though of was the control vent AC flap Actuator stuck open. I can change the value, but not sure if there are bleed ports to get the air out of the system.
I have a pretty busy day today and don't know if I will be able to get back to you till tomorrow, at which time I can answer any further questions.
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