Heater issues
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New User
Joined: Aug 2011
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Heater issues
Hi. Havving a issue with my 1991 f350. It will produce heat but will NOT blow it out. We have replaced the heater blower motor, the heater blower resistor, the fan switch. Still not blowing out the heat. The blower motor is gettting power. Is there something we are missing? going nuts 
trying to figure out what is wrong. Its a typical Montana witner and Im missing not having heat blowinng out of the vents. Help please.
trying to figure out what is wrong. Its a typical Montana witner and Im missing not having heat blowinng out of the vents. Help please.
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Joined: May 2007
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On these trucks the resistor is on the ground side of the motor circuit- the power comes from the function switch(the one marked A/C, Vent, Off, Heat, Mix, Defrost, etc.) to the motor, out of the motor through the resistor, on to the fan switch and finally to ground. So you need to make sure that the fan switch has a good ground.Or you could unplug the connector from the resistor, find the wire coming from the motor, and connect it to ground to see if the motor runs. Make sure the function switch is not in the Off position.
Last edited by Bansheesandrider; Dec 22, 2012 at 09:15 AM. Reason: more info
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