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Unread 07-01-2013, 07:03 AM   #1
mysavioreigns
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The ever-popular blower motor problem.

Hi all, new here. Had hoped to sign up under less stressful circumstances, but here I am.

I've got a 4-day road-trip planned (in 95* weather) and sure enough, the blower motor has stopped blowing. I've lurked here for a long time so I know about the resistor and connector, and all of that was checked/replaced with no issues. The relays and fuses are all okay as well. My guess is, the actual blower motor is kaput.

(edit: I should have mentioned, if anyone cares: the motor will not engage on any setting (1-4) but the a/c compressor is definitely engaging. The resistor and connector were spotless & had no melting, which kind of surprised me).

But, before I shell out $100 for a new one, I want to make absolute sure that this is the issue. Can someone tell me how to check the blower motor? If I recall, I run a lead from the + battery post to the motor, but I'm not sure where to attach, and what grounds need to be run, etc. etc.

Thanks for the help!

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Unread 07-01-2013, 07:06 AM   #2
Floreancig_XJ
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Should be easy, your right ive done it on a pathfinder just pull it out and look at the connections, should be easy to tell where the leads are going... Positive to positive, ground to ground. Run off a 12v power source.. If all is well itll kick in, if not voila
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Unread 07-01-2013, 08:06 AM   #3
gs69350
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Take the motor out and visually inspect it. Remove the windshield washer tank and the motor is behind it, 3 screws and its out. In my case, the motor shaft wore through the bushing. It was done for. $26.99 for a new VDO/Siemens brand fan @ autozone.
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Unread 07-01-2013, 08:15 AM   #4
tim111762
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I'd throw in a new relay just to be sure. Worth the $12. My blower went out and wouldn't run on any setting. Relay looked good other than a little brown around the prongs. Swapped it out a d was good to go.
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Unread 07-01-2013, 08:21 AM   #5
mysavioreigns
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Thanks for the replies everyone. I'll check that Floreancig.

So gs69350, you're saying the fan had become disconnected from the motor shaft? Interesting. I'll take it out and inspect it.

tim111762, I plan on it. The "fan control" relay (in the engine compartment fuse box) was a non-stock relay, so I'm thinking this may have been swapped before. It definitely wouldn't hurt.
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Unread 07-01-2013, 08:29 AM   #6
CCKen
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Here's a pic of the blower relay (behind glove box), and a pic of your blower circuit diagram:



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Unread 07-01-2013, 08:32 AM   #7
CCKen
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And a pic of the fuse locations in your PDC:

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Unread 07-01-2013, 08:41 AM   #8
mysavioreigns
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Thanks CCKen! I did not even think about that relay under the dash (I got it mixed up with the Radiator Fan Relay). Great pics, as well.
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Unread 07-01-2013, 08:53 AM   #9
gs69350
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Quote:
Originally Posted by mysavioreigns View Post
Thanks for the replies everyone. I'll check that Floreancig.

So gs69350, you're saying the fan had become disconnected from the motor shaft? Interesting. I'll take it out and inspect it.

tim111762, I plan on it. The "fan control" relay (in the engine compartment fuse box) was a non-stock relay, so I'm thinking this may have been swapped before. It definitely wouldn't hurt.
No, the steel shaft wore through the bronze bushing and then in the motor housing letting the armature of the motor hit the magnet, basically, it was completely wore out. I'll snap a pic and post it tonight if I can remember. Not the first time I've seen a blower motor do this. It is very obvious if this is the problem once the fan is out and the squirrel cage removed.
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1998 Jeep Cherokee Sport - 3.5" Skyjacker --GONE--
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Unread 07-01-2013, 12:26 PM   #10
mysavioreigns
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You guys rock, the issue is fixed!

Turns out the relay was burnt out under the dash, as CCKen showed above. $9 and 20 seconds later, it works. Thanks again everyone :-)
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Unread 07-01-2013, 02:32 PM   #11
CCKen
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Good work.

Thanks for the follow-up.

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Unread 07-01-2013, 07:55 PM   #12
pat_ton69
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CC Ken, thanks for posting the picture. I have had the same problem for several years and didn't know where to look. I checked thus afternoon and the spades in my relay appear to be burnt. Went to O'REILLYs and they told me I would have to get a new one from Jeep. Is that right?
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Unread 07-02-2013, 04:11 AM   #13
CCKen
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Quote:
Originally Posted by pat_ton69 View Post
CC Ken, thanks for posting the picture. I have had the same problem for several years and didn't know where to look. I checked thus afternoon and the spades in my relay appear to be burnt. Went to O'REILLYs and they told me I would have to get a new one from Jeep. Is that right?
What they say is incorrect. The relay is the same as the other relays like it in the PDC. Just tell them you need a Starter Motor Relay. Just make sure the relay you get is rated for 40 Amps.
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Unread 07-02-2013, 06:29 AM   #14
gs69350
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Quote:
Originally Posted by mysavioreigns View Post
You guys rock, the issue is fixed!

Turns out the relay was burnt out under the dash, as CCKen showed above. $9 and 20 seconds later, it works. Thanks again everyone :-)
Woot woot!
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1998 Jeep Cherokee Sport - 3.5" Skyjacker --GONE--
1996 Jeep Cherokee Government Edition - 3.5" BDS/Zone Lift --GONE--
1998 Jeep Grand Cherokee 5.9 Limited Platinum; 2" BB, 225/75/16 Wrangler MT/R --GONE--
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Unread 07-08-2013, 08:00 PM   #15
pat_ton69
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Relay didn't fix it even though a few of the terminals looked discolored. Changed the resistor pack and now it works on all speeds. Now on to the
A/C.
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