Quote:
Originally Posted by platt-deutsch
The Duovalve could be not shutting all the way off and some hot water is getting into the heater cores..
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Yes, and there are many other maladies with the ACC that could be degrading performance.
It sounds like the OP has gone through the system reasonably thoroughly.
Sounds like the aux fans are working properly. Their main function is come on at excessive high side pressure in order to bring it down and that's what they're doing.
I think the system is coming up only marginally short of optimum performance.