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Jack:
I believe (not 100% sure) that the default for low/no vacuum is to direct the air flow to the windshield, so i don't believe the vacuum is affecting your problem.
Can you run the same tests as before, but with the water valve disconnected?
If you have a voltmeter you can put that on the battery and monitor the voltage while doing the tests, then trying to determine if the voltage drops off alot during the tests. With the engine running, nominal voltage will be 13.8 to 14.2 volts.
Gilly
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