Volvo RWD 700 Forum

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Re: Heater won't completely shut off hot air 700

posted by  someone claiming to be John Sargent on  Mon Oct 2 14:14 CST 2000 [RELATED]

Yes. Vacuum to close the water valve is only applied at port 1 in AC mode and vent mode. Floor, floor/defrost, and defrost positions of the heater selector lever do not apply vacuum to the water valve, and it allows full flow of engine cooling water through the heater core.






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