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Discussion Starter #1
Hi all!

My heater isn't working right. No matter where I slide the temperature, the heat stays on full heat (exept when it is to far left where there is no heat).

Has anyone else had this problem, or know what I could look at to try and fix it?

You guys are great, any response will be appreciated (even wise-cracks!)


-Hugh
 

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You described exactly what is going on with my system. My aircon does work and so does my heat but it is either all or non. Anyone know how to fix this..
 

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Mine is the same. I believe the reason is temp sensor, if you have one. Mine has been disconnected because it is loud, so, of course it can't measure interior temp and adjust.
 

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Oh great. I'm working on my friends car, but he has the opposite problem, no heat. So I am replacing the heater **** valve and vacuum solenoid. It corroded and broke from seepage on brass. However, we also disconneted his temp sensor a while back due to that "noise" and now I guess when I get his heat working he'll be sweating. I wonder if it is possoble to replace the temp sensor with another type, like a bimetal strip in a home thermostat? simlple solder job at the disconnected wires under the glove box maybe? I'll try something like that if I need to.
 

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Discussion Starter #6
I think it is the under the circular vent in the dashboard just to the left of the glove box.

Mine started making a screech, i took it out and cleaned the blower motor's axle (it was gummed up with hair and crap) and it it stopped screeching.

I think it must have a temperature sensor that sends a signal to the heater valve Zbartsky was talking about.
 

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Some of the time, what you are describing can be attributed to the power servo (vacuum actuator behind the glove box) not working.

Try manually actuating this to see if the air stops blowing hot.

The power servo is no longer available so you will have to find one in a junkyard.

I just recently (2 days ago) went completely through replacing and connecting all the vacuum hoses in the engine compartment and under the dash per the manual because the A/C would not blow out through the dash vents - only the floor vents. The a/c shop I had taken it to had totally bollixed up the works. I now have cold air where it is supposed to be and warm air where IT is supposed to be.
 
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