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Old 06-12-2013, 12:48 AM   #5
48richard
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Join Date: Oct 2009
Location: Phoenix, AZ
Posts: 475
Re: Heater Troubleshooting

The vacuum controlled water valve only closes when the control is set to "Inside". When you are using outside air the heater is still getting hot water. For the summer I have connected my heater valve directly to the vacuum reservoir, so whenever the engine is running the water valve is closed. Makes a big difference to AC performance.
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1971 C10 Longbed, 350/TH350
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