I'm missing this part?
 

Can anyone tell me what this is? It looks like a valve/switch that goes to the heater but I didn't have it. How does it work, what's it's function?
https://cimg7.ibsrv.net/gimg/www.yot...e06efe320d.jpg

That would be your heater control valve. It connects to the heater lever in the dash and allows you to adjust the flow of coolant going into the heater core which helps control how hot the air is coming out of the vents.

It should look like this:
Picture from 22RE Performance: https://22reperformance.com/22re-coo...-control-valve

https://cimg5.ibsrv.net/gimg/www.yot...95900664a5.jpg

:safari:

Thanks Jake
Do I really need it? When I took out the dash I didn't see any cables going thru the firewall where that would have been. When I got the truck PO just had the two heater hoses connected to the heater core, one in and one out.

Wow, Pricey little sucker................Funny, I have the mounting bracket. I was wondering where that went.........

I think with your core hooked up the way you describe, you must have hot water flowing through all the time.

You can convert it to the later plastic ones that don't rust out. I've done all the measuring and it will bolt right in with a few minor tweeks.

Ok, so where do I find the one you're talking about, I looked but........... a few minor tweeks you say??? humm
Hey Larry, got a pic of yours? Thanks :(
Rad stopped by last night, spent a few hours here then took off. Nice guy, enjoyed the visit.

Made by Nippon Denso (ND) PN: 87240-89124 – 08/1988 thru 11/1995, on 4Runner and pickup.
I got a few from the parts yard they don't rust so no problem.

Yes, drill one hole for a mounting tab the bolt hole aligns perfectly, then when you install the heater hoses realign them a bit.
I test mounted one already but have to do another project before I can do the final install.

:coffee:

The newer style valve is a good idea.

It looks like this:
Picture also from 22RE Performance:
https://cimg9.ibsrv.net/gimg/www.yot...90138095ee.jpg


Also, did RAD run away after he saw the wiring you were dealing with? LOL

:safari:

LOL. We actually looked at for for awhile. he offered to help me when I'm ready to start on the wiring. I showed him the big pile and it didn't seem to bother him, I'm kind of not being intimidated by it as much as I was when I first puled it all out, it's growing on me..........

Also so
What is the direction mean? I "will" have a coolant hose coming from under the intake manifold (block off plate) and the other one is coming from the coolant pipe near the drivers side motor mount. which one goes where. Does it matter which side of the heater core the pipes enter and exit?

You mean this pile
https://cimg0.ibsrv.net/gimg/www.yot...1e7eef942d.jpg
Or this pile for my next build, a 91 EFI engine which is in pieces...........
https://cimg3.ibsrv.net/gimg/www.yot...0a0d026432.jpg
https://cimg5.ibsrv.net/gimg/www.yot...34298f9400.jpg

Ok, I just looked at my heater box and control. When I move the lever from cool to warm a big flap opens on the right side of the box. I also noticed a hole and a plastic bracket for a cable on that lever. I am assuming that is where the cable goes for the valve that I'm missing. So now I need the valve and a length of cable in order to "make it right" again. I would really like to get the PO and his son and give them a good wack for there stupidity. (Just venting)
Anyway, another question for you guys, the foam or whatever it "was" on the flaps of the heater, what can I replace that with? It's also on the dash vents. Just looking to get it working to the best I can.

If you scrub real hard it might come off.


The hose on the driver's side goes into the driver's side of the valve.

Correct, new cables are available from the dealer and don't really cost much. Did you get any cables from the PO?

No cables from PO

I will head down to my salvage yard and see if the 91 4runner I grabed the master cylinder and booster from has this valve.Maybe be able to get under the dash and grab that cable.

If I were me (and I am) in your case I would grab the whole thing - with the control unit (levers et al) that way you will know which cable goes to what devise.

Good point, I'll see what's there. They might be different from a 84 PU to the 91 4runner. but I'll check it out. Thanks

Hit the mother load today,,,,,,,woo hoo
Went to the salvage yard to find the heater valve and cable, well I not only found the heater valve and cable from a 91 4runner, (the plastic one) He had a 86 Toyota pickup! I found most of my GRAY dash parts including the frame, not the best of shape but nothing a good cleaning won't cure. Also found the shifter boot plate, some window plates that go above the dash and one nice door trim.Got the dash frame out with the heater control still attached and it has a clock in it. I checked the dash parts against mine and they all match...woo hoo I wish they had lotto in Utah............check it out.
https://cimg1.ibsrv.net/gimg/www.yot...74e2223687.jpg
https://cimg4.ibsrv.net/gimg/www.yot...ddf6a471fa.jpg
https://cimg8.ibsrv.net/gimg/www.yot...8770cc4143.jpg

Good! Ray is a nice person! I am no longer intimidated by wiring. Sometimes it takes a little while to wrap my head around a circuit design, but once I understand what is supposed to happen and why components are connected the way they are, I can fix problems pretty well.

I mean the first pile, but you would have a real mess if you combined both piles into one wiring harness. That gives me a strange thought..... An engine that is both carbureted and fuel injected...... hummm... it probably wouldn't end well..... :con:


Nice score!!

Usually when I go to my local Pick 'n Pull they either don't have any 1984-1988 Toyota Trucks or the ones that are in the yard have been pretty much stripped clean, minus some broken parts. I should get there as soon as one comes into the yard.

:safari:

Ok Jake, you're invited to the wiring party when I get there:D
Yeah, it was a nice score I didn't mention the buckets and the center console with the shifter piece that goes in front of the console, mint! I have to take a pic,divers side seat has a rip but otherwise they are pretty clean, for being 32 years old (pulled from a 86)
I have the 2 piles of wires separated, I made sure of that.Still haven't decided if I'm going to open up the harness's and pull out the wires I won't need. We'll see when I get there