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Heater valve

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Joined: Fri Jun 27, 2014 3:11 pm
Location: Southern California

Heater valve

Post by jsspagg » Sat Nov 21, 2020 4:53 am

Pretty much trying to replace what I can where I can.... which brings me to the heater valve. I was told that they all pretty much leak and I saw some evidence of a leak stain in my existing heater valve. I happen to have an extra one (pictured) that came out of another car and was not intending on using it. The one pictured appears to be in better condition and I did not see any evidence of leaking when I removed, though no guarantee. I am not able to source a new one so I'm trying to figure out if there is a way to pressure/leak test these valves.

Anyone do this before?
Heater Valve.jpg
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Ralph in Socal
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Re: Heater valve

Post by Ralph in Socal » Sat Nov 21, 2020 5:18 am

I’ve gravity tested by installing the valve to the heater core and extension pipe then standing the assembly on end and filling with water. The valve would be at the bottom and experiences gravity pressure from the water

An old heater valve that appeared good leaked at the selector shaft seal

Of course you can rig up a couple pieces of hose and a pressure gauge to the two ports and apply about 10 psi to get it under higher pressure

New valves are available on ebay coming from Lithuania. Somewhat of a long lead time though

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