Can't get heater hose valve to stop leaking

jmardyMember

I'm at the end of my rope here.
I installed a ball valve in my heater line while I had my heads off.
Got the new heads put on and started to refill the coolant system.
Thought I'd pressure test it first and I had a leak at my new ball valve.
So I took it out, tested it. Held 35PSI on the bench. No issues.
Installed in the car, leaks.
New silicone heater hose from block to valve.
Still leaks.
Removed the valve and installed a plain union.
Still leaks.
I have never had a problem with a coolant hose like this.
Any ideas?
I'm using lined hose clamps.
The ball valve has barbed NPT fittings.

9/2/217:53 PM

Original Post

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