Heater core shutoff

Nero · May 29, 2023

Well friendos, time for a new mod I want to do.

I saw on Russ's truck that he has a vacuum actuated heater core shutoff installed. Has anyone ran one? Which one to run? My goal is to have it controlled by the same vac source as when I turn on the "Max AC" which also would close the recirculation door.

It's either that, or run a manual ball valve. But for the desire of not having to pop my hood every time... I'd rather just run a vacuum one.

DrCharles · May 29, 2023

I have done that on my truck... definitely helps the a/c work better. I'll have to sort through the pile of parts invoices to see which valve I bought.

Thomas87 · May 29, 2023

I just installed mine the other day when I did my coolant filter. Very easy install. Napa #6601294 for the valve

Nero · May 29, 2023

I was short of finding that part number, I'll get one of those ordered, thank you!

Austin86250 · May 29, 2023

I couldn’t resist getting one after seeing the post

Thomas87 · May 29, 2023

It's just such an easy mod to do and makes a noticeable difference! Anyone with one of these trucks should do it

DrCharles · May 29, 2023

Sorry I couldn't find a part number but it looks like you've got a good one

yes, it definitely made a difference on Max A/C.

I think this is the one I got (just make sure whichever you use defaults to open, and closes with vacuum applied!)

https://www.autozone.com/cooling-heating-and-climate-control/heater-control-valve/p/four-seasons-heater-control-valve-74859/730323_0_0

Nero · May 29, 2023

So the question I have for @Thomas87, the Napa #6601294 one, does it turn off the heater core, but allow coolant to flow to the valve then loop back around? Or does it dead head the coolant flow?
The one that @DrCharles listed would work, but dead heads the coolant flow, which also stops flow to the coolant filter I just installed.

Thomas87 · May 29, 2023

@Nero it loops the coolant back around. I tested it by blowing through it before I installed lol

franklin2 · May 29, 2023

The correct valve is for a Ford ranger. You will have to look a little bit to see what year. If I remember it's a 1990's model.

Jesus Freak · May 29, 2023

Why would you do that? Isn't it cold and snowy where you're at all the time?

Thomas87 · May 29, 2023

franklin2 said:
The correct valve is for a Ford ranger. You will have to look a little bit to see what year. If I remember it's a 1990's model.

Correct, the valve I mentioned is what came factory on the early rangers and a few other various Ford vehicles at the time.

Austin86250 · May 29, 2023

Wow that was noticeable, how do you effectively tap into the max ac circuit

Thomas87 · May 29, 2023

Austin86250 said:
Wow that was noticeable, how do you effectively tap into the max ac circuit

Cut the little hard line going to the door actuator, slip some vacuum hose over each end and put a tee in. If you zoom in on the picture I posted you can see how it's tee'd into

Austin86250 · May 29, 2023

Thomas87 said:
Cut the little hard line going to the door actuator, slip some vacuum hose over each end and put a tee in. If you zoom in on the picture I posted you can see how it's tee'd into

Oh ok I want sure you could do that,

Heater core shutoff

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