Engine Size: 4.0
Refrigerant Type: r134
Country of Origin: United States
2001 Jeep Cherokee 4x4
Noticed that the other day my blower motor (running on setting 4 (high)) would quickly turn off and turn on and then keep running until later do the same thing. Then the motor would not turn on on either settings 1-4. Then as quickly as it stopped it turned back on and stayed on for a good while. Noticed that there was blue smoke coming out of the air vents and smelled wires burning for a brief 5 seconds or two. Looked at the relay behind the glove box, noticed charing on the terminals and very hot. Replaced relay but blower motor continues to briefly go in and out but stay on most of the time. I am now keeping the blower on setting 2 and have kept it running there for about a week and it seems to be doing fine with no burning smells or anything.
This all seemed to happen about the time the weather has been at 90 degrees or hotter outside and the car temp is extremely hot inside. Go Figure the air to act funny when you need it. (Had the blower motor replaced about 2 years ago due to the motor making a clicking noise and it stopping altogether for about a week and then just had it replaced). I do not know if the blower motor needs to be replaced again or some other relay or air control panel or resistors need to be replaced.
Any ideas would be greatly appreciated.
I would check the blower motor resistor. It should be in with the blower motor assembly under/behind the glove box. That would be the first place to start. Try taking that out and applying 12v to the blower motor and see if it runs continuously without falling off.
Thank you for that suggestion. What would I run it with 12 volts? Like some kind of tool or something?
A Power Probe is going to be your best tool. There is another way which would involve a small gauge wire, probably around 16ga. and just going from the battery to the positive terminal on the blower motor to power it up.
Also check the connection where the relay plugs in, as it could also be burned if the relay was.. Could be causing the bad contact between the harness and the relay.
Freedoms just another word for nothing left to lose
I had a blower motor do that once. The connection at the motor got loose and the resulting arcing ruined the motor and melted the wire. If any terminals have been that hot, they may never make a good connection again and therefore cause the problem to recur.
Does anyone know if the connection to that motor is on the outside of the firewall at the engine or inside for this model?
It is at the blower motor which is in the right rear of the engine compartment. I'll see if I can locate a picture.
I will look when I get home. thanks for the tips.
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You're a good man Adam. Thank you.
Ok, I changed the blower motor resistor which was corroded and had gigantic dust globs attached to it. It was also rusted around the cage which I assume was caused by the leaking evaporator that was replaced 2 years ago. All wires looked great under there and I also checked the knobs where you turn the fan on and the wires look good back there.
The blower did not blow at all this time. Got under the hood and checked out the blower motor and I can tell it looks like the wire that connects to the blower motor has either gotten too hot and melted or its just a bad connection. Looks chafed. It is hard to tell cause everything is black and can't tell if there is charing. I did notice the wire that plugs into the blower motor is coming from inside the truck under the glove compartment where I changed the blower motor resistor. Is this something that I can change myself. I can't seem to understand the connection to the blower motor. Is it a clip on connector cause it looks like it is covered with a plastic waterproof sheeth. Not really sure if I can even get my hand down there to pull it out. Is there some kind of picture of this and or a tool to help change this out without having to remove the dryer and pulling the motor out?
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