Heater/fan problem
10-17-2011, 01:39 AM
#1
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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.
10-18-2011, 09:06 PM
#4
TECH Senior Member
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.
10-19-2011, 08:55 AM
#6
TECH Senior Member
Yes, you are correct... the resistor module is bypassed and a relay switches the blower motor on.
Last edited by joecar; 10-19-2011 at 09:43 AM.
10-24-2011, 01:55 PM
#7
TECH Regular
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.