kevin__jeep

I've researched this and can't figure out an answer, any help is appreciated

What I've looked at/repaired:
- Dash/Panel switch OK
- New Resistor
- Under hood connector was failing, replaced.

The problem:
- Blower motor stops working, all switch positions. Rapping firmly on the bottom of the Evap housing below the glove box will bring the fan back to life, but it spins up VERY slowly.

Initially I replaced the blower motor resistor, thinking that because of proximity to where I was hitting under the glove box, it could be the issue. For ~$15 it was worth a try. I really am at a loss for what the issue could be.

The solution (?)
My guess now is that the blower motor is drawing a ton of current, and that initially fried my under-hood connector. Now the motor is just seized up at the brushes, and maybe hitting the evap housing kinda jolts it free to get it spinning again.

- Should I test resistance on the blower motor using a multimeter? Would that tell me if it's bad?

I appreciate any help, thanks!

kevin__jeep

One extra note: I noticed the other day that while running the A/C, a LOT of moisture/frost began to accumulate in the cubby just below my glove box. I don't know if it's related, but since it's the same area of the vehicle I thought it worth a mention.

1991cherokee

Coming from a electricians point of view. Your motor is more than likely bad. Checking to insure proper power and over current protection is in place would be a good idea prior to replacing the motor. Carbon build up on the brushes most likely is why your getting a slow start and why it will not turn over on its own without a couple kicks. Hope it helps

moparado

If you want to troubleshoot the motor, turn the blower on high then check to see if its getting approx. 12 volts at its two terminals.

First try this.
Wiggle the motor connector and tap the motor itself.

I can just about guarantee, if all that wiggling/tapping starts or stops the blower, its a bad motor or its connector pins are spread or corroded. Hard area to get to.

kevin__jeep

I checked the terminals and was getting 12v at the underhood connector. I went ahead and picked up a new blwoer motor at Autozone and the part has correct mounting tabs, but the cooling vent hole in the motor housing is 180* from the stock part, so while it mounts up I can't reattach the rubber hose.

I'm returning that part and have already ordered a new motor online, I'll post back if it it all works out.

Thanks for the help/advice!

moparado

Cooling vent? Rubber hose?
What kind of vehicle and year do you have?
My 2k XJ's blower motor has no rubber hoses, just the electrical connector.

Make sure the electrical connector doesn't have spread or corroded pins.

kevin__jeep

1996, as pictured with new motor test fit. You can see the hose underneath, and the relief in the housing on top.

cruiser54

Kevin, be sure and check to see if this drain hose is clear.