Hi everyone!

just got in my car and drove for one block when the a/c stopped blowing air alltogether. So basically the blower motor quit. Where do I start diagnosing the problem? Would be great if you could explain it to me in layman terms what to do and where to find it.
I have a multimeter just not quite sure how to use it to diagnose what is broken.
From your experience, what is usually the culprit and how much will that cost me?

Thanks as usual for all your help! I'm sure it will be a relatively easy fix!

Nick

 

The "Fan resistor" (I hate that, it's a regulator, not resistor) is most often the culprit of any blower motor problems. If the fuse is good, then I'd order a 'resistor', very easy to change.

As to using your meter, if you take things apart so as to get to the 'resistor', you can measure to make sure it is getting the two things it needs:
1) 12 volt power
2) The enable signal from the controller, this is a 1.4 to 8 or 9 volt signal, the higher the voltage, the faster the blower will turn.

The other thing you can measure is the output to the motor - if you turn the fan **** to full speed, the output of the module should be very close to the input voltage (around 12 to 14 volts).

 

I had to add R134 twice (with leak-stop) twice 3 years ago. Worked great since.

 

Ok, never mind....

 

You can find directions on the "blower resistor replacement" in 100/80's post of complied technical advice:
https://www.crossfireforum.org/forum...s-repairs.html

 

The HVAC control box can be temperamental (?)
Have you tried gently "tapping" the fan speed **** ? that can sometimes wake it up again.
just a thought.

 

Maybe better still the Heating and Air Conditioning section explains a test of the module. CLICK
Also there is a PDF that states that the dial on the dash fails because of poor contacts behind the control. CLICK