Quote:
Originally Posted by Diseasel300
Unplug the monovalve and go for a drive. If you have full heat all the time, it's a control issue. If you have intermittent or random heat, the monovalve cartridge is bad. The SDL will heat fine with the Aux pump dead, so a failed one will not cause a lack of heat.
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I’ve unplugged the Auxiliary Water Pump and the Monovalve and still get very little heat. I will be flushing the system first and pouring in new coolant (Zerex G-05). The car sat for quite some time so I may be fighting a partially plugged heater core. I’ve also chased down and resolved several electrical gremlins in the car in the two weeks that I’ve owned it. I will not be surprised at all to find that both the Auxiliary Water Pump and Monovalve are faulty.