1987 - 1996 F150 & Larger F-Series Trucks1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks
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PS if you get the cheap one at the part store spray the coils with some clear aerosol sealant.... That will keep the rust and water off the coils for a few extra years. You don't need to do it heavy... just a light dusting to keep moisture off them.
Spray??? If a new resistor unit only lasted a month I'll bet your motor is getting old and the bearings are dry causing the motor to pull too many amps...
You can try to oil the bearings if you want but it won't last long....
__________________ No matter how carefully you choose your words, they'll always end up being twisted by others! 1993 Thunderbird LX 3.8L AOD.
1997 Explorer XLT 4X2 4.0L SOHC 5R55E
1997 F-250 HD Extended cab, long bed, 5.8L, E4OD.
The only reason I spray mine with a light layer of clear coat (or wild dog 40 depending on what i have at hand). It helps keep the salty wet conditions off the coils that go inside the heater housing. I have had a couple fail within 3-4 years on me, so I coat the coils to prevent the coils from rusting so quick (it could be b/c I am buying the cheapest resistors too ).
That being said the clear coating only helps to keep the resistor coils from rusting... You shouldn't be having a resistor fail within a month! How do you know it's the resistor failing???
How do I know its failing... When the fan only works on high, I replace that part and it works at all sopeeds. Lol. The truck hasnt been used much since the part was replaced. But I did notice some noise from the fan motor the last time I drove it. i will have to take a look.
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