Quote:
Originally Posted by micalk
Pulled the connector to the monovalve to see what effect that would have, and it actually had no effect - still blows hot air. Any suggestions on where else to look would be appreciated.
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Disconnecting the mono valve causes it to default to full heat. When 12V is applied it shuts off the flow of water. Before you replace the ACC check your Aux pump. If it's shorted or drawing too many amps it will fry your new ACC. This could be the reason it's blowing hot...no 12V to the mono valve. You can disassemble your ACC & look at the PC board. If the Aux pump is bad you should be able to see a burned trace on the circuit board & repair it. It's also a good idea to install a fuse (about 1 amp) inline with the Aux pump to protect the ACC from an overload. If the Aux pump is bad it can be unplugged with no harm to the system. The only drawback is low water flow at idle causing a drop in heater output.