Question about 2002 Jeep Grand Cherokee

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My jeep blower motor would come on and off.The blower motor now, will not come on. I checked motor with 12v it works.All fuses checked with ohm meter,ok.I checked for loose connections,none. I disassembled dash heater control to see if anything looks obvious,nothing.I did not test it,I just did a visual.Any ideas would be helpful. thanks My jeep is a 2002 grand cherokee overland 4.7HO the jeep has auto temp control

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I had the same issue. It turned out that one of the wires had burned out and therefore the connection would not hold. The dealership had to replace the wire and the connection point. They said that it is a manufacturer problem, however, generally it takes about four years to fail...so they don't have to replace it.

Posted on Nov 09, 2010

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2002 jeep grand cherokee heater fan wont turn on when you turn the dial.


Do you know how to test automotive electrical circuit's , looking at a wiring diagram so you know what all is involved in the blower motor circuit . Using a DVOM - digital volt ohm meter to test the circuit . Free wiring diagram's here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size . Under system click HVAC ,then under subsystem click on HVAC controls . Click the search button then the blue link .The thing's that could be wrong , blower motor it's self , the blower motor controller for automatic climate control , a blown fuse -but fuse's don't just blow for no reason - short to ground maybe ! 40 amp fuse #1 in the under hood fuse box . Blower motor resistor block if your vehicle has manual climate control .
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How do i fix a heater in a 91 jeep cherokee laredo?


fails on high, need this first.....@!!!!

if it fails on high then you hot wire the blower,

does the blower work with 12vdc applied to it, unpugged?

very old car.

use alldata.com to get the FSM data. and schematics.

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the switch bypasses the resistor block on high, so high is first

use a 10 buck DMM volt meter at walfart.

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bad fuse,
it can only be 3 things, a voltmeter finds this easy and every time.
bad fuse, bad switch bad, motor.
as we all know that includes all wires and connections, fore ever.
so you can check the blower , 12vdc on high.
if 12v there, and motor is silent the motor is bad or lost its ground.
to check that 100% apply 12vdc to the motor, bingo it works?
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so now i have 12v to the switch and no 12v out. must be a bad switch
easy huh?
ill now look yours up to see if there are other oddities.
alldata.com
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electrics is my game
i go to page 3 for HVAC, allh the heater, omg 2 relays 1 fan
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ok 1/2 done.
next relay is Power side blower relay.
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all that , in 5min flat , alldata.com
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ask questions.

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1 Answer

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http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

page 47
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1 Answer

My 2005 Jeep Grand Cherokee heater only blows air on the high setting, I ohm tested the HVAC fuse under the hood and only get response on 1 leg.


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