Heater/fan problem
Thread Starter
Teching In
Joined: Sep 2006
Posts: 19
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Heater/fan problem 97 Formula. Has no a/c unit at all. The heater will blow nice and hot, but the fan will not turn on high. It works on the other speeds. Any thoughts on what I need to replace? The search garnered no results, but I could have missed it.
TECH Senior Member
Joined: Apr 2002
Posts: 6,080
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From: So.Cal.
There is a resistor module which consists of a resistor coil with taps for each of the fan speeds...
remove it and look to see if the high-speed end of the resistor coil has come loose or is burnt out.
remove it and look to see if the high-speed end of the resistor coil has come loose or is burnt out.
TECH Senior Member
Joined: Apr 2002
Posts: 6,080
Likes: 17
From: So.Cal.
Yes, you are correct... the resistor module is bypassed and a relay switches the blower motor on.
Last edited by joecar; Oct 19, 2011 at 09:43 AM.
TECH Regular
Joined: Oct 2011
Posts: 407
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From: Keller Tx
So you can look and see the voltage ar the fan motor. High should be 12V. It is amazing this technology has not changed over the years.
I had the exact same problem on my 79T/A with the resistor pack. I finally bypassed it and put it to a switch on the dash. On high or off. I didn't care at least it worked.
I had the exact same problem on my 79T/A with the resistor pack. I finally bypassed it and put it to a switch on the dash. On high or off. I didn't care at least it worked.
