APU inside A/C fan not blowing

yes....change it out...

a resistor should not cost too much money, again, take it to an auto zone store, since a/c parts are (at times) universal. and if not, well off to the dealership OR truck parts place you go...

 

Ill bet you that is a true statement. Resistors dont just fail because, there really isnt anything in them to wear out. Check for excessive voltage, or a bad wire with a soft spot in it. Could just even be the ground not making good contact, thats actually my guess.

After you make sure you have decent voltage try to bypass the resistor and see what you get.

 

Make sure the air filter if there is one for the unit is clean and not blocked, or that the blower section of the fan doesn't have crud, dead mice, etc. in it, causing an overload.

 

resistors can "just fail" given the hours that we use the heater and a/c systems over the times we use those items in our 4 wheelers.

given vibration a truck goes through out the day as well. its only a rolled coil in many instances.

take into consideration the age of Gears truck, and miles....i'd say he's lucky he went as far as he did. i do also believe he bought it used..?? so no telling how many MORE hours that system was working...

 

Yeh,resistor sounds bad,Wire may have a bare spot and grounding out.Make sure ur fan turns free.U gonna make a mechanic yet.

 

I was told my blower fan motor could have been the culprit causing my problems. It was possibly dragging and drawing more current just because it was old. It worked after we replaced the resistor and AC thermostat but I decided to replace it a week later anyways to keep from having any more troubleble. Sure is nice to have a freezing cold AC that works right. This was on my cab AC the resistor was behind the console under the dash...

 

looks like a thermal sensor....probably there to be mounted in the a/c plenum to keep the resistor cool, after all they do generate a heck of a lotta heat, reducing voltages to work the selector switch for the fan speeds.

do not forget, trucks are driving many, many hours, compared to the 4 wheelers and then they get to work or where ever, and shut them off....so that resistor is going to be MUCH hotter than the ordinary 4 wheeler would ever...

yep, looking at all the pics if you were to look at the expansion valve (under the hood) you would see the very same "sensor" type that this resistor has....

 

that "wire" is called a "capillary tube"