Heater Always On. Climate control knob controls blow speed?

Feti916 said:

I have a 1990 legend LS and i am trying to get it as manageable as possible.

I have swapped out the control unit to no prevail, and am assuming it is a relay. I could be wrong, and i would like some input on what this issue may be.

The Control knob that controls temperature when u mess with it it actually only speeds up or slows down the blow speed which is either, very light, or OMG ITS HOT lol.

The control unit lights flash though all the different buttons like a star trek space ship and i am only able to use AUTO and OFF.

Any ideas?

Click to expand...

you have two knobs one for blower and speed and the temperature.
make sure you connected it correct.
the lights it may be the bulb as well

bro mine looks nothing like that. mine is wood grain



above the stereo, which has been removed... is the one i am talking about

On your auto climate, press and hold down the AUTO and OFF at the same time. If a light turns on in the manual control area, you have a bad item that needs to be replaced:



And for your speedo, there's a nut that splits in in the middle. Follow it from the firewall and you'll see this nut. The end of it goes to the transmission VSS. Loosen the nut and once you have it split, re-grease it in side of it. Hopefully that'll loosen it up for ya.

Yea, it must not be the control unit. This one looks tough. It's got to be a short, grounded wire, relay, or some other failed component causing a short circuit situation. I have never seen or heard about a problem like this in the Legend.

here is one thing I read that was relevant in the manual, (22-6)

NOTE: If you have one of the above symptoms, but no self-diagnosis indicator light, one df the basic heaterlair conditioner
components controlled by the system could be the cause, i.e., blower motor,A/C compressor clutch, recirculation
control motor, etc. Refer to the standard Heater and Air Conditioner section for troubleshooting and testing.

The manual also has a diagram(22-8) of the basic system components. Everything before the control unit flows through a "triple pressure switch" which appears to have its own ground. Check that out.

Tough because even the PCM is a possible cause. Follow the flow charts and tests. Don't throw parts at the problem. Start with the easiest tests like physical connections and grounds. Good luck my friend.