How to replace A/C blower motor

Tiny
LJPTKEYS
  • MEMBER
  • 1 POST
  • 1995 JEEP CHEROKEE
  • 150,000 MILES
Hi there, 1995 jeep cherokee sport 4.0lt. 6cyl. Hvac problem the short of the story is that the blower motor is not functioning, not even on high. I know that if it was functioning on high, then it could be a bm resistor issue, but that doesn't appear to be the case. Given that I went ahead and replaced the blower motor, as that's what most likely seemed to be the issue. What I didn't, but should have done was test for power at the connector, because I installed the new motor and it will not work either. I replaced the ac relay in the pdc, no luck. I've looked at the fuse schematic in the owners manual, and that's the only fuse/relay that seems to be connected to the system. So at this point i'm not sure what I should be looking for. I can't really figure out where the blower motor is supposed to draw power from, and subsequently why it's not getting said power. Any ideas?
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Monday, April 22nd, 2019 AT 6:14 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Have checked fuse #7 blower motor is hot all the time switch provides ground
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Monday, April 22nd, 2019 AT 6:14 PM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 33,749 POSTS
To get you started, look at the ignition switch. They can develop burned contacts, especially if you use the heater fan on the highest speeds a lot. Also look for two blackened terminals in the connector and signs of melting on the plastic connector body.

If everything looks good at the connector, use a test light to find the two or three 12 volt feed wires, then turn the switch to "run" and look for the additional wires that get 12 volts. I don't have a service manual for that year, but you'll be looking for a pretty fat wire that doesn't get 12 volts or the test light just lights up dimly. If you find one like that you can use a stretched out cotter pin to jump 12 volts to it to see if the fan runs. If that works, suspect the switch.
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Monday, April 22nd, 2019 AT 6:14 PM (Merged)
Tiny
HHWHITE22
  • MEMBER
  • 6 POSTS
I checked all fuses under hood. #7 gets no power, but fuse still good.
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Monday, April 22nd, 2019 AT 6:14 PM (Merged)
Tiny
DOCFIXIT
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Checking in power distribution chenter? Using a meter? Do not check across fuse ground to body then test. Fues is direct feed from battery
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Monday, April 22nd, 2019 AT 6:14 PM (Merged)
Tiny
HHWHITE22
  • MEMBER
  • 6 POSTS
Gotcha. I have everything hanging out, and am getting frustrated. Lol It is only 106 in my garage. Im giving up for the day. Thank you for your assistance. I will probably be back tomorrow.
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Monday, April 22nd, 2019 AT 6:14 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
O.K. Heat and frustration don't mix
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Monday, April 22nd, 2019 AT 6:14 PM (Merged)
Tiny
JWHITE
  • MEMBER
  • 2 POSTS
  • 1998 JEEP CHEROKEE
My jeep has 135,000, 6 cyl. Engin. The heater blower motor stopped working in all positions. I changed resistor, checked all fuses problem still exists.
Any suggestions would be greatly appreciated.
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Monday, April 22nd, 2019 AT 6:14 PM (Merged)
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Most likley the blower motor. Can you test for power or where it drops off? Switch is a possiblity, but long shot.
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Monday, April 22nd, 2019 AT 6:14 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
What happened?
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Monday, April 22nd, 2019 AT 6:14 PM (Merged)
Tiny
JWHITE
  • MEMBER
  • 2 POSTS
Thanks for the reply, I did test the blower motor directly to battery and it came on. Any ideas?
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Monday, April 22nd, 2019 AT 6:14 PM (Merged)
Tiny
HHWHITE22
  • MEMBER
  • 6 POSTS
Hey, sorry had a bad week. Got my finger caqught in my shop vac motor fan. Needless to say im stiched up. Lol
Okay, I checked those fuses, and they get power, I took my switches off my dash and messed up the "zone" switch so I ordered a new one which I got today. Once I figure out how to install new switch- what if blower motor still doesnt get power? You mentioned resistor. Where is that? My manual doesnt exactly give me a location.
Thnx 4 help!
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Monday, April 22nd, 2019 AT 6:14 PM (Merged)
Tiny
SERVICE WRITER
  • MECHANIC
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Yer welcome. Did you check the blower motor relay or fuse?
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Monday, April 22nd, 2019 AT 6:14 PM (Merged)
Tiny
SERVICE WRITER
  • MECHANIC
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Relay is located in wiring harness connector that is secured to heater housing, behind glove box.

Fuse 25 in the junction block.

Check yer email.
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Monday, April 22nd, 2019 AT 6:14 PM (Merged)

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