heater control valve

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Nov 16, 2006 | 11:44 PM

timothy47129

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From: southern Indiana

heater control valve

Does the 1978 f150 have a heater control valve?Someone installed a plumbing shut-off valve on mine.If so were does the vacuum line connect to control the valve?Any pics would help.
Also I dont know if it matters or not but it has factory ac.

Thanks,
Tim

Last edited by timothy47129; Nov 16, 2006 at 11:47 PM.

Nov 17, 2006 | 12:06 AM

Mil1ion

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I assume you are dealing with A/C ?

You didn't mention it.

The heater control valve on AC equipped cars is part of the heater hose assembly.

I don't recall ever seeing a shut off valve like on previous trucks on a 78.
Mine didn't have one

Nov 17, 2006 | 08:14 AM

Troy77+79

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From: North Carolina

My '78 F-150 has one. Went out and snapped a couple pics.

Heater Valve

Hose Routing

I was going to replace the valve, but it turned out to just need some cleaning and lube and it works fine. I did already buy one from O'Reilly's, it looked quite different but should function the same. It's housing was made out of plastic instead of metal. Was only $8.99 + Tax here in NC.

Nov 17, 2006 | 09:35 AM

Troy77+79

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Here is a photo of the new valve borrowed from the O'Reilly website.

Valve

Part #74612

Nov 18, 2006 | 07:31 AM

ole yeller 1978

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The 78 does have a vacume motor to control the coolant going to the heater core.On one end the vacume line hooks to the vacume motor on the other it hooks to the heater controls in the cab

Nov 18, 2006 | 11:39 AM

Torque1st

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Those heater hose valves don't seal very well which may be why the plumbing valve was installed. Make sure you clean out the air mixing valve inside the heater. They often get full of debris and do not operate properly.

Nov 18, 2006 | 02:02 PM

timothy47129

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From: southern Indiana

I cleaned everything inside and out.I might just get a new 1/4 turn plumbing valve if the vacuum ones dont shut-off all the way.The valve thats on there doesnt close all the way.So I was either going back to stock vacuum valve or a new 1/4 turn shut-off valve. A 1/4 turn brass shut-off is cheaper.The vacuum valve runs $15.00 at auto parts stores around here.

Tim

Last edited by timothy47129; Nov 18, 2006 at 02:05 PM.