NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA Unibody Jeep Technical Forums > Jeep Cherokee XJ (1984 - 2001) > OEM Tech Discussion
HOME Member FAQ Sponsor Info Rules Bylaws E-Mail

OEM Tech Discussion Forum for OEM (Original Equipment) or stock XJs and MJs.

Reply
 
Thread Tools Display Modes
  #1  
Old December 6th, 2017, 14:09
kyle_inreallife kyle_inreallife is offline
NAXJA Forum User
 
Join Date: Dec 2017
Location: California
Posts: 31
Not blowing air

87 xj Wagoneer limited

I want to do what I can before taking off the dash. The levers on the hvac controls feel like they're mechanically actuating the switches so I don't think it's disconnected. Blower for vents/heat and ac compressor both don't turn on. I was thinking blower motor or connection but i don't think that explains no AC sooooooo.....where do I start?


Sent from my iPhone using Tapatalk
Reply With Quote
  #2  
Old December 6th, 2017, 14:29
ehall's Avatar
ehall ehall is offline
NAXJA Member
 
Join Date: Dec 2007
Location: Southern Maryland
Posts: 9,008
Re: Not blowing air

One of the more common failures is the speed dial on the HVAC control unit, the dial is known to melt and short the contacts. Not a hard repair but before you do that you should verify the fuses and motor. There is a blower motor fuse either under the hood or under the dash, I can't recall. You can also use some wire to run direct battery power to the blower motor and verify that its not seized.
__________________
.
my '91 beater rebuild
Reply With Quote
  #3  
Old December 6th, 2017, 17:02
Ecomike's Avatar
Ecomike Ecomike is offline
NAXJA# 2091
 
Join Date: Dec 2006
Location: MilkyWay Galaxy
Posts: 15,035
Re: Not blowing air

It could be one or more of the following.

The blower fuse under the dash drivers side..
The wire to the Ignition switch that powers the Blower and radio and WS Wipers.
The ignition switch (contacts that power the blower etc)
The AC blower speed switch.
The speed resistor pack that blower selector switch powers to drop the blower speed it is under the dash on the passenger side
And the blower motor itself.
10 years ago I had to replace them all on an 85 and many of them on the 87, with in about three years as one going bad stresses them all into overheating.

The Wagoneer is super rare and very valuable now!!!

If yours is a manual transmission check the fuse and fuse holder as the master cylinder likes to leak brake fluid from the Transmission MS onto it and it ruins the fuse contacts in the fuse block.

On my 87 Wagoneer, I replaced the wires from the battery to the fuse to the ignitions witch, with 10 gauge wire (stock is 14 gauge BS) and a 30 amp dash toggle switch and 30 am breaker (fuse). It also runs the electric seats and windows, and radio and windshield wiper and turn signals on one piss ant 14 gauge wire.
__________________
Quote=8Mud: "Go ahead and put up the best fence you can build, I'll bet on some Mexican with a few dollars of nails and a pile of scrap lumber."
34 MPG , '85 2WD Cherokee Pioneer with custom installed, 64 hp, 2.2 L Nissan SD22 Diesel 5 spd Manual; & 4 Renix XJs, '87 Wagoneer 4.0, 4WD, 89-Cherokee, 4WD, '87 Cherokee 2WD, & '89 Cherokee Pioneer 2WD, all 4dr. #2091

Last edited by Ecomike; December 6th, 2017 at 17:07.
Reply With Quote
  #4  
Old December 6th, 2017, 19:32
kyle_inreallife kyle_inreallife is offline
NAXJA Forum User
 
Join Date: Dec 2017
Location: California
Posts: 31
Not blowing air

Quote:
Originally Posted by Ecomike View Post
It could be one or more of the following.

The blower fuse under the dash drivers side..
The wire to the Ignition switch that powers the Blower and radio and WS Wipers.
The ignition switch (contacts that power the blower etc)
The AC blower speed switch.
The speed resistor pack that blower selector switch powers to drop the blower speed it is under the dash on the passenger side
And the blower motor itself.
10 years ago I had to replace them all on an 85 and many of them on the 87, with in about three years as one going bad stresses them all into overheating.

The Wagoneer is super rare and very valuable now!!!

If yours is a manual transmission check the fuse and fuse holder as the master cylinder likes to leak brake fluid from the Transmission MS onto it and it ruins the fuse contacts in the fuse block.

On my 87 Wagoneer, I replaced the wires from the battery to the fuse to the ignitions witch, with 10 gauge wire (stock is 14 gauge BS) and a 30 amp dash toggle switch and 30 am breaker (fuse). It also runs the electric seats and windows, and radio and windshield wiper and turn signals on one piss ant 14 gauge wire.


Extremely helpful! Would you mind if I pm'd you as I get into it?


Sent from my iPhone using Tapatalk
Reply With Quote
  #5  
Old December 7th, 2017, 04:13
Ecomike's Avatar
Ecomike Ecomike is offline
NAXJA# 2091
 
Join Date: Dec 2006
Location: MilkyWay Galaxy
Posts: 15,035
Re: Not blowing air

PM is fine, no problem, but sharing the repair path publicly serves others with the same problem in the future.
__________________
Quote=8Mud: "Go ahead and put up the best fence you can build, I'll bet on some Mexican with a few dollars of nails and a pile of scrap lumber."
34 MPG , '85 2WD Cherokee Pioneer with custom installed, 64 hp, 2.2 L Nissan SD22 Diesel 5 spd Manual; & 4 Renix XJs, '87 Wagoneer 4.0, 4WD, 89-Cherokee, 4WD, '87 Cherokee 2WD, & '89 Cherokee Pioneer 2WD, all 4dr. #2091
Reply With Quote
  #6  
Old December 7th, 2017, 06:58
kyle_inreallife kyle_inreallife is offline
NAXJA Forum User
 
Join Date: Dec 2017
Location: California
Posts: 31
Not blowing air

Fair enough! Will follow up this weekend when I get into it.


Sent from my iPhone using Tapatalk
Reply With Quote
  #7  
Old December 8th, 2017, 04:33
old_man's Avatar
old_man old_man is offline
NAXJA Member
 
Join Date: May 2003
Location: Loveland, Colorado
Posts: 15,362
Re: Not blowing air

If you can hear the motor run in the high mode only then it is probably the resistor pack. If you can hear the motor in all speeds, check to make sure it isn't coming out the defrosters all the time. If so you have a vacuum leak. If it simply does not run at all, check the fuse, then measure voltage on the motor directly. If you have voltage there, replace the fan.

Happy Hunting.
__________________
Tom Houston - Former Colorado Chapter President & Terminal Adrenaline Junkie
Loveland, Colorado
You're just jealous because the voices don't talk to you.
Reply With Quote
  #8  
Old December 9th, 2017, 04:53
cruiser54's Avatar
cruiser54 cruiser54 is offline
NAXJA Forum User
 
Join Date: Nov 2009
Location: Prescott, Az
Posts: 6,373
Re: Not blowing air

Here's something you should do as a preventative measure while you're working on it.

http://cruiser54.com/?p=211
Reply With Quote
  #9  
Old April 18th, 2018, 18:55
BattlebornXJ BattlebornXJ is offline
NAXJA Forum User
 
Join Date: Aug 2017
Location: NEVADA
Posts: 2
Re: Not blowing air

Had the same problem. Have a 2000 XJ. Suddenly fan not blowing air from vents. Passenger kick panel fuse #25 good. 40A fuse under hood in Power distribution box good. Switch has continuity. A/C clutch engages when A/C is selected. Connected fan motor directly to 12V, fan motor good. Fan motor connector getting 12V only when fan switch is in position 1, and selector switch is in OFF position. Resistor pack has continuity from all spades. WTF?
Well, Chrysler in its infinite wisdom put the relay for the blower motor under the dash directly behind the glove compartment. Tested the relay and guess what? Yep, that was the problem. $9.00 at Autozone. Remove the three screws from the hinge at the bottom of the glove compartmrent door, release the latch and it pops right off. Spent hours diagnosing, and the fix took 5 minutes. WHY didn't Chrysler just put the relay in the under hood box with the others?
Reply With Quote
  #10  
Old April 21st, 2018, 11:36
Ecomike's Avatar
Ecomike Ecomike is offline
NAXJA# 2091
 
Join Date: Dec 2006
Location: MilkyWay Galaxy
Posts: 15,035
Re: Not blowing air

Earlier Jeeps had no relay, and would burn up the speed switch, Ignition switch, resistor pack, and fuse and contacts under driver side dash. The put the relay in to solve all those problems, and put it close the Blower and Resistor pack where large gauge wires need to be, to save on wire cost. That blower pulls a large amp load all the time. Car companies are not interested in make vehicles easy to service. Never have been

Quote:
Originally Posted by BattlebornXJ View Post
Had the same problem. Have a 2000 XJ. Suddenly fan not blowing air from vents. Passenger kick panel fuse #25 good. 40A fuse under hood in Power distribution box good. Switch has continuity. A/C clutch engages when A/C is selected. Connected fan motor directly to 12V, fan motor good. Fan motor connector getting 12V only when fan switch is in position 1, and selector switch is in OFF position. Resistor pack has continuity from all spades. WTF?
Well, Chrysler in its infinite wisdom put the relay for the blower motor under the dash directly behind the glove compartment. Tested the relay and guess what? Yep, that was the problem. $9.00 at Autozone. Remove the three screws from the hinge at the bottom of the glove compartmrent door, release the latch and it pops right off. Spent hours diagnosing, and the fix took 5 minutes. WHY didn't Chrysler just put the relay in the under hood box with the others?
__________________
Quote=8Mud: "Go ahead and put up the best fence you can build, I'll bet on some Mexican with a few dollars of nails and a pile of scrap lumber."
34 MPG , '85 2WD Cherokee Pioneer with custom installed, 64 hp, 2.2 L Nissan SD22 Diesel 5 spd Manual; & 4 Renix XJs, '87 Wagoneer 4.0, 4WD, 89-Cherokee, 4WD, '87 Cherokee 2WD, & '89 Cherokee Pioneer 2WD, all 4dr. #2091
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Blower's blowing, but's not blowing....huh? mhopton OEM Tech Discussion 15 July 18th, 2010 21:56
88 XJ Blowing Oil F1504x2 OEM Tech Discussion 4 June 22nd, 2009 06:43
A/C blowing hot only when it is hot and humid MattS OEM Tech Discussion 12 July 29th, 2008 11:52
blowing fuses JIMBOJAMES OEM Tech Discussion 0 May 6th, 2007 13:42
A/C blowing at 60F blackbat21 OEM Tech Discussion 13 December 3rd, 2006 14:19


All times are GMT -7. The time now is 00:39.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014