Quote:
Originally Posted by 80stech
I don't think the auxilary water pump makes that big a difference to the heat with the engine running.
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It makes 100% of the difference. At idle you get 0% cabin heat without the aux pump. When wife’s aux pump died we would have to put in neutral and force about 1800-2000 rpm though red lights or the cabin would be quite cold. This is with ambient about 30F.