AC blower motor problems.

**beans20** · 06-13-2016

Here lately my truck, when I turn on the AC the blower motor doesn't kick on. When I first bought the truck it happened 1 time and I thought it was a fluke, but now it's a reoccurring thing with it starting to get hot and humid I need to get this fixed. I've thought about the blower motor being a problem but then I got to thinking that it only does it when it's in AC mode. It didn't do it at all during the winter months. It doesn't just come back on after turning the truck off then back in either it may be 24hrs before it kicks back on. I've replaced the blower motor module as well as the blower motor relay. I have no clue what the problem is. I just purchased a new blower motor hoping that will help but I guess we'll see. But if anyone can offer any insight It would be appreciated. Also my truck don't have a blower motor resistor either. I know where it's supposed to be normally but it isn't there, and there is no place for it to go or any wires for a resistor. I've looked at diagrams of the AC parts and some trucks were made with the resistor and some weren't. It's a 2013 2500.

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**theaaronbush** · 06-13-2016

Hope you figure this out! Can't be having no ac!

2012 Ram 2500, 4x4, 3.73, 3" level, 35" tires, 4" FloPro TBE, EGR valve/cooler/throttle delete, S&B CAI, GDP heater delete, GDP S2, RaceME Ultra Warp Tuning

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**turboguy327** · 06-13-2016

Use a volt meter. Is the blower motor getting good power? Good ground?

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**beans20** · 06-13-2016

Originally Posted by turboguy327

Use a volt meter. Is the blower motor getting good power? Good ground?

Do you know what the voltage should be? If I figure out its not get the proper voltage what should I do to fix it?

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**turboguy327** · 06-13-2016

Originally Posted by beans20

Do you know what the voltage should be? If I figure out its not get the proper voltage what should I do to fix it?

The voltage will vary depending on the speed commanded. Full blower would be battery voltage and as you command a slower fan speed the voltage will drop. So if one doesn't match the other it's not the blower motor. If they do correlate, replace the blower.

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**Polaraco** · 06-13-2016

Originally Posted by beans20

Here lately my truck, when I turn on the AC the blower motor doesn't kick on. When I first bought the truck it happened 1 time and I thought it was a fluke, but now it's a reoccurring thing with it starting to get hot and humid I need to get this fixed. I've thought about the blower motor being a problem but then I got to thinking that it only does it when it's in AC mode. It didn't do it at all during the winter months. It doesn't just come back on after turning the truck off then back in either it may be 24hrs before it kicks back on. I've replaced the blower motor module as well as the blower motor relay. I have no clue what the problem is. I just purchased a new blower motor hoping that will help but I guess we'll see. But if anyone can offer any insight It would be appreciated. Also my truck don't have a blower motor resistor either. I know where it's supposed to be normally but it isn't there, and there is no place for it to go or any wires for a resistor. I've looked at diagrams of the AC parts and some trucks were made with the resistor and some weren't. It's a 2013 2500.

Do you have a wiring diagram?

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