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Old 01-26-2015, 01:33 PM   #1
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89 Chieftain heater core valve

Anybody have a picture of the proper hook up, and where the missing vacuum hose comes from.
Also, does the valve use vacuum to open, or close , which side of the core does it go, in, or out.
Assuming that is a vacuum operated valve.
Also, anyone have a clue as to what the homeless green wire goes to??
may have to go the route of old cars, and just put a manual valve, or a manual H valve/bypass.
I want to make the heater core operable.


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Old 01-26-2015, 01:39 PM   #2
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Quote:
Originally Posted by IamJerryP View Post
Anybody have a picture of the proper hook up, and where the missing vacuum hose comes from.
Also, does the valve use vacuum to open, or close , which side of the core does it go, in, or out.
Assuming that is a vacuum operated valve.
Also, anyone have a clue as to what the homeless green wire goes to??
may have to go the route of old cars, and just put a manual valve, or a manual H valve/bypass.
I want to make the heater core operable.Attachment 84323
That looks like the temperature control for your heater and the vacuum hose for that should originate from the heater control on your dash board
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Old 01-26-2015, 01:48 PM   #3
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Are you sure that the green wire, is not the vacuum line? Should be controlled by the heater controls.
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Old 01-26-2015, 01:49 PM   #4
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That looks like the temperature control for your heater and the vacuum hose for that should originate from the heater control on your dash board
Thanks, that is a start, I went out to look for it, and I think the green wire is actually a vacuum line.

Never been a fan of air controls, the principle is great, the execution, not so much.
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Old 01-26-2015, 02:01 PM   #5
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Are you sure that the green wire, is not the vacuum line? Should be controlled by the heater controls.
You are right, I just looked at it, and it must be the vacuum line that goes to the valve.
Now I need to figure if the core went bad, and was bypassed. and if the valve is bad, or just needs to be hooked up.
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Old 01-26-2015, 03:17 PM   #6
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You are right, I just looked at it, and it must be the vacuum line that goes to the valve.
Now I need to figure if the core went bad, and was bypassed. and if the valve is bad, or just needs to be hooked up.
Just hook a hose to it and suck on it the lever should move if it is still good.
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Old 01-26-2015, 04:46 PM   #7
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Jerry check these products. I replaced the heater control valve in the Monterey with a 4 port version. In my case, the cable connection to the back of heater controls broke.

Thermotion Store. Electronic Coolant Control Valve

12 v and a $0.89 pot from Radio Shack. I also took the opportunity to replace the heater hoses. The wiring harness they supply wasn't long enough for me, so I needed to splice in some old trailer wiring I had hanging around.
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Old 01-26-2015, 05:18 PM   #8
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I am going to guess the previous owner experience a heater core leak. Not uncommon in the older model. Sometimes the valve will work but the vacuum hose my have a leak or the control valve on the dash may be defective.
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Old 01-26-2015, 11:42 PM   #9
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Jerry, could you test the heater core with air pressure? Hook two short hoses to the in and out, plug one, put a valve stem in the other one, clamp it tight, charge it with about 10 to 15 lbs of air pressure and see if it leaks off? Would be a whole lot less of a mess than with water! As for the valve, I would just put a on/off lever valve till you get everything else sorted out first! Those old dash vac. selectors were a pain, and leaked all the time!
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