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auxilliary water pump question
I'm troubleshooting my off and on heating, and have already replaced the monovalve piston. Through reading here, I've arrived at the auxilliary water pump as a possible culprit.
Question: (w123 300TD '85)
1. Under what conditions does this pump operate? (heat on, car at op temp, thermostat open, which dash switches, etc?)
I can test it by feeling for vibration I assume, as it's mounted in a rubber sleeve. So far, it feels dead. However, I hooked up a known working used pump to the harness and I can't get it to work either... so when does this puppy turn on?
Thanks!
k
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