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92 plymouth colt

R

rlp in Co.

Well-known Member
My air conditioner was kinda working, but not real cold air. Now the belt broke and I think I know why the air wasn't real cold. The heater doesn't shut off all the way! It was hot yesterday and the heater was putting out hot air! There is a cable that goes to the heater and it moves ok and still make the heat very hot, but the heat doesn't shut off completely. What do you think is wrong? It looks like a big job to take the heater out.
 
Didn't a car 29 years old control the heater by shutting off the hot water to the heater core? Could be cable is rusted or shut off valve is stuck.
You could remove heater hoses to heater core an block them off or tie the ends together for a simple fix.
 
Geo,

I think your idea of wrapping the heater hoses together is a great temporary fix. Many years ago, I lived in Minnesota. The A/C on my 1968 Torino stopped working and the heater was putting out hot air. I put a U-shaped metal adapter in and hooked the two heater hoses to it. It was enough to get me by until I could locate and install a new heater control valve. Although it gets hot in the summer in Minnesota, it was bearable for a while.

Tom in TN
 
Thanks for that idea. That's what I'm doing now. Much easier than fixing the heater. It looked like I would have to remove whole the dash! Next time I go to town I'm going to see if I can find a valve, to shut it off or turn it on. Here in Colorado, it can be hot in the daytime and cold at nite!
 
If you tied the two ends together, you would loose a little bit of cooling capacity. I think blocking them off is the better idea.
 
It looks like there no heater valve available for that model. So I suspect a cable is not moving a door in the unit properly. I do not know how you feel about this but you can go to your local library and look at a repair manual for your car. For a small fee you can copy pages of the manual. That old of a car the library would probably still have a printed manual. Many newer model cars you can only access the repair manual by computer through a automotive data base they subscribe to.
 
The heat control damper really needs to close completely to work. Shutting off the hot water will be a big help, but it will still be blending warm air with the cool.

You might not have to take the whole thing out to fix it. Could be a kinked cable, loose housing, or something fell down the defrost and is jamming the door. Often removing the glove box liner will give better access.
 
Do you have a shut off valve or a modulator.
I had to replace the modulator on my 2007 GMC.
I'm guessing a 92 would have a shot valve.

You could install a ball valve, turn off water when it's hot. Turn on when you are cold manually. Redneck repair.
 

I dunno what broke your belt but it was not the heater interfering with the AC...

If you block off the heater hoses pay attention to the temperature of the engine. Some engines depend on circulation thru the heater core as a bypass function... Most don't I have see engines overheat by blocking a heater hose its is rare tho...

Infor for 80/90's is becoming hard to come by.
 
Ford, GMC, and Chrysler all made heater hose bypass valves. Some are cable controlled and some are vacuum controlled. I put a vacuum controlled one on my F 150 last summer. The heater door on it is vacuum controlled so I put a T in to operate the bypass. It used 5/8 hoses. Check your hose size and look on eBay for the valve. It makes a huge difference.
 
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