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Water Heater Valve checking Any past experiences? 700 1991

posted by  Allanwayne on  Fri Jun 10 15:33 CST 2005
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last visit: Sun Jul 8 15:05 CST 2012
[RELATED]

Howdy,
A/C air is only slightly cold, so the trouble shooting begins...

How much vacuum should be measured at the heater control valve on the A/C (closed) setting. I get only 5 inch Hg, which is far from the 20 inch Hg of the normal intake manifold vacuum. Anyone know what it should read in order to fully close the valve.

I suppose I could unclamp the close leading to the heater core while the temp is selected to full cold and see if any coolant is getting through, but I thought I'd try the quick and neat approach first.

Comments?






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