heater switch

tynall44 · Post by **tynall44** » Mon Dec 05, 2011 6:13 pm

my heater switch wont blow on high : i replaced the switch so i know its the thing on the heter box i dont know what its called but how do you get to em to change them....

basketcase0302 · Post by **basketcase0302** » Mon Dec 05, 2011 7:21 pm

The "resistor" is on the backside of the assembly-held in by two 5/16" head screws, you can see it in this picture:

I'm not sure if you can pull it out without unbolting the housing or not?

Anybody else been able to pull it out without unbolting the housing?

knightfire83 · Post by **knightfire83** » Fri Dec 09, 2011 11:27 am

The resistor doesn't do anything on high, it controls low and medium.

When on high, the heater switch supplies power directly to the motor, bypassing the resistor coils.

#270 would be high
#268 & 269 would be the other two speeds.

I would start by checking the wiring for #270 that runs to the resistor assembly. Check for corrosion or a broken wire. Also check to make shure the blower motor has a strong good ground, because high draws allot of amps.

If that's all ok, then suspect the new switch.

tynall44 · Post by **tynall44** » Sun Dec 11, 2011 1:29 am

it blows on everything but high and both switches did it thats why i thought it was the resistor,,,,

70 ranger · Post by **70 ranger** » Sun Dec 11, 2011 2:14 am

What about running a power wire to the motor itself and by passing the switch. There is a connector about 6 inches from the motor on the power wire.

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