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heat entering inside vehicle even with heater switch on off position? 700 1990

posted by  Chris Mullet on  Fri May 22 02:25 CST 2009
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last visit: Fri Oct 24 09:08 CST 2014
[RELATED]

Your heater control valve is worn out and not closing all the way - easy access to replace it on a 740.

Or the vacuum source to the valve is absent. The valve works opposite of what you would expect. It takes a vacuum source to CLOSE the valve. A loss of vacuum allows the valve to go full OPEN. This can be caused by a split or loose vacuum hose or maybe the control panel in the dash is goofed up.






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