Help identifying a coolant part

[Corrin Brannon]

this small thing is leaking coolant, it’s on the back left side of the engine, I have a 4.L engine although a similar thing exists on my 3.L please let me know if you have any clue on what it is or what it does. Thank yall

 

[2011Supercab]

Heater control valve

 

[lil_Blue_Ford]

Yup, heater control valve. It shuts off coolant flow to the heater core when you’re running the AC so the AC gets colder

 

[superj]

I am glad yall knew that. If it leaked on my truck i would have had to take a pic and ask, too

 

[lil_Blue_Ford]

I am glad yall knew that. If it leaked on my truck i would have had to take a pic and ask, too

I know it because I’ve been considering adding that to my older trucks although I’d have to rig up a vacuum connection and control, but it would help the AC

 

[2011Supercab]

I know it because I’ve been considering adding that to my older trucks although I’d have to rig up a vacuum connection and control, but it would help the AC

You could always get an electric one, same wire that activates A/C clutch can activate the valve.

25-1555M - Electronic Bypass Heater Valve

Old Air Products manufactures Electronic Bypass Heater Valves

www.oldairproducts.com

 

[lil_Blue_Ford]

You could always get an electric one, same wire that activates A/C clutch can activate the valve.

25-1555M - Electronic Bypass Heater Valve

Old Air Products manufactures Electronic Bypass Heater Valves

www.oldairproducts.com

I didn’t know an electric one was an option…. Hmm…

 

[HighMileage93]

I have one that doesn't seem to be getting vacuum. Any clue what could cause that? Heat dial is all the way and the selector set to floor dash. (not AC side) 2000 2.5l

 

[2011Supercab]

I have one that doesn't seem to be getting vacuum. Any clue what could cause that? Heat dial is all the way and the selector set to floor dash. (not AC side) 2000 2.5l

The only time there will be any vacuum to that valve is when you have the A/C set to MAX to shut the hot water off to the heater core.

 

[HighMileage93]

Thanks, that's good to know. Not getting much heat out of it. One hose is hot the other not. Maybe it's stuck in the closed position? Plugged up?

 

[lil_Blue_Ford]

Thanks, that's good to know. Not getting much heat out of it. One hose is hot the other not. Maybe it's stuck in the closed position? Plugged up?

There were two different valves used over the years, the one went on only one hose to shut off flow, the other went on both hoses and when it shut off to the heater core it would circulate back. If it’s on both hoses, both hoses should get warm.

You can pull the vacuum line off or manually cycle the valve as well. They are spring loaded so you have to hold it but you can check valve operation easy enough.

Poor heat output can be caused by a bunch of things including a bad thermostat, water pump, heater core, control valve, mouse nest in the ducts, blower motor, blower motor resistor, blend door stuck, etc. Gonna have to do some investigating. If the truck is getting warm but not overheating, then it’s probably not water pump or thermostat.