Quote:
Originally Posted by ctaylor738
Have you checked the change in the resistance values when you move the temp wheel from cold to hot? What do you get?
Also, for $5, George Murphy at Performance Analysis will sell you a very good troubleshooting guide with a lot of additional information about the system. He is also good on the phone, 865-482-9175.
Doesn't a diode act like a one way gate in current flow? If it goes bad, no signal to the servo to move to heat.
I feel your pain, I had the same thing in my miserable '81. It took a servo, amp, pushbutton unit, and a flush of the heater core to get it going.
BTW - your fuses are good, aren't they? Sorry, I had to ask.
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The wheel & the other sensors all have resistance well within the ranges spec'd by the mbz cd info. I think I'll give George a call later today; thanks for that tip. I'm very curious to see what he has to say about the diode & if these symptoms can be caused by it. It acts like a wiring problem almost, since even with the pushbutton switch in off when you turn the key the servo immediately drive to the extreme (which I assume is full cool) & won't budge regardless of thumbwheel adjustment OR temps @ other sensors.
And yea, the fuses are okay. You can't assume anything.