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Old 10-31-2007
The_Dealer's Avatar
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Join Date: Apr 2007
Location: Macon Georgia
Posts: 348
Leaking coolant from sensor under heater hose T

Wassup guys, i thought i had all the bugs worked out of my truck, then i found something new. On the heater hoses when theres 2 comming out of the firewall and there is that T that goes to one hose, on the bottom theres this sensor looking thing with a grey vacuum hose comming out running to the firewall. well its leaking antifreeze out of where the vacuum hose runs into it. its leaking right where the vaccum hose plugs into it, its on the bottom side of the plastic t job. what is this called, what does it do and how can i stop the leaking. i just noticed this, and was thinking i could zip tie the hose end onto the sensor. if anyone knows what this is and how to fix it it would be much appreciated. thanks guys for all the help!

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Old 10-31-2007
Rockledge's Avatar
Join Date: Nov 2006
Location: Connecticut
Posts: 479
It's called a "heater control valve" and is also often referred to as a "hot water valve". A few years ago I picked up a new one for my '98 from Napa for under $20.00.
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Old 10-31-2007
V8 Level II's Avatar
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Location: Michigan
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x2. Swap in a new one and your leak should be gone, at least for awhile.

The factory Ford valves usually last about 6~8 years before they leak. Some aftermarket valves are as good as the stockers, some aren't.
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