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Originally Posted by The Gears
...behind the unit or inside the plastic unit case.
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Inside. It's the K-1 relay, one of four. But the few that I have seen were not labeled.
Quote:
Originally Posted by The Gears
The wiring diagram shows a temperature switch and a vacuum switch in the supply line to the Aux. motor.
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My schematic does not agree with that.
Quote:
Originally Posted by The Gears
New (used) heater control unit works all the right things but no heat.
Thanks
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If you have no heat at all, the problem probably involves more than just the aux water pump. Unless the pump happens to be completely obstructed.