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Old 11-18-2019, 04:23 PM   #26
Senior Member
Join Date: Nov 2016
Location: Lexington MA
Posts: 130
Default Re: 52 v8 flathead heater

Hi Merc
I thought the valve was normally open? How strong should the engine vacuum be.? It doesn't seem to be strong enough to operate the diaphragm. When I run water thru the valve it flows easily. My wipers are very weak as well. Any way, since I have bypassed the control valve, circulation seems to stop at the heater core since the exit tube is cold! I should have solved this during the summer!
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