Cain1970

My HVAC blower motor completely stopped working on my 2008 JK X. This begin a couple of weeks ago out of the blue. I've been trying to repair this for the past week. With help from this forum I've replaced the blower motor, resistor, and relay, but the motor still does not operate.

Below is a list of things I've tried:

- I've ran 12V directly to the blower motor and the motor runs.

- I've confirmed with a voltmeter that the blower motor receives 12V from the plug when the fan switch is on. When the fan switch is off the plug yields zero volts. (Puzzling tho that the voltage does not change at the plug whether the switch setting is on low or high.)

- I have reset the system by disconnecting the battery for ten minutes.

- I have wiggled every wire I can think of with the system on at the time.

- At one point I had replaced the blower motor but not the relay or resistor. I went to the auto parts store. They handed me a new relay. I plugged it in and turned the key. The blower worked in all settings. I thought it was repaired so I went back in the store and paid for the relay. I went back out to the car and the blower has not worked since. That's when I ordered a new resistor and replaced it.

Any ideas? How do I check the blower switch?

Thanks in advance.

ronjenx

Where in the vehicle did you find the HVAC blower motor relay? (I seem to be drawing a blank on it.)

Cain1970

I believe it's relay K9 in the relay/fuse box under the hood.

ronjenx

That's the relay for a rear blower, if your JK has one. It has no effect on the front blower.

As far as I can tell, there is no relay for the front blower. It's controlled electronically through the TIPM and the A/C control panel's circuit board.

Cain1970

OK - I appreciate the input. My Jeep does not have a rear blower. I'm wondering now: Does relay K9 control anything else besides a rear blower?

ronjenx

Not that I can see in the TIPM.
K9's socket has two pins that connect directly to the battery bus. It has one pin that would send power to fuse J15 for the rear blower. There is no pin in the socket that would control the relay coil. Therefore, it's safe to say relay K9 controls nothing else. It's a sleeping dog, of sorts.

Cain1970

OK - it's good to know that I replaced a relay that does nothing in my jeep.

I've read additional threads regarding similar issues with the blower motor. They point to problems with the climate control array.

Any hints on how I can determine if the climate control array in my jeep is bad before I order a replacement?

ronjenx

The dealer's scan tool can track requests over the CAN bus, and the resultant actions. Unfortunately, they charge quite a lot to look at such things.

rodney.neilson@gmail.com

Still have the same problem with my 2012 JK. It's not the blower motor, blower motor resistor, or climate control module...all have been tested and or replaced. One tech advises that it could be a pinched wire because when he was troubleshooting the control module he noticed some shady wiring and tapping back there. This is odd because I bought the vehicle new and he was the first guy to ever remove the dash. He showed it to me...it was pretty sketchy looking. They spent 3+ hours trying to solve the issue. They couldn't and didn't charge me a dime. I don't think I'm going to get the same from the dealer. But now my only option is to take it to the dealer and hope its not a TIPM replacement...that will cost a lot.

Spoonduke714

Hey guys I see I'm a couple years late on this but I had the same issue and determined it to be the fan speed switch.

If you take the center dash cover off, you can access the plug to the blower motor speed switch. It will have 4 wires running to it. 3 are blue with a color stripe. I believe those are the different speeds of the blower. The 4th wire is black and white. That is your power in. I know there is a way to test for congruence and current and blah blah blah. My multimeter was dead and this is Florida in the summer. Anyway I McGuyvered it with a paperclip and pliers. Any wire will do the trick. Just touch one end to the black and white connecter receptacle and the other end to any of the blue wires. The only thing you are bypassing by doing this is the switch. If the blower kicks on, the problem is the switch.

I pried the back off of my switch and found it pretty gooped yp inside on the contacts. Cleeaned it all realy good with a wire brush, put it back together and it kicked right on.

Hope this helps