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Unread 02-02-2010, 07:16 AM   #1
vfrpilot
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Heater? Blower? Fuses?

Okay boys - this's prob been visited many times, but I aint really got the luxury of time to sit, search & browse threads...

This morning I have NO BLOWER and no real heat I could feel except in the DEFROST position - I'm headin back out now after making a cold 5 mile drive - (this time with jeans instead of pajamas) to check fuses..

if this isnt it..any quick suggestions / experiences?

I wont have time to really explore the forum until tonight (14 hrs) but need heat before that..

Thanks for any help... back in a few
UPDATE:
Did a little searching as time permits - i'm up against it man
Ok, checked fuse behind glove box - its good.
I have NO fan speeds - and have read that if the resistor was bad I'd still have HIGH - am I correct in this so far?
I looked under hood - in that box (the far upper left fuse I assume) - I dunno how to tell if its bad or not??
Plus it seems to be a bear to get out - gotta try needlenoses? - I dont have another of those anyway - could it be that one??
================================================== ==============
UPDATE CONT.
Ok, just went for my morning 3 mile daily drive and while apologizing for lack of heat / explaining the prob; I twisted the fan switch and WAAA-LAAA! It worked! On all speeds?!?!?!

So, opinions suggestions and suspicions are requested guys!!!

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Last edited by vfrpilot; 02-03-2010 at 08:25 AM.. Reason: update 2
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Unread 02-03-2010, 07:12 AM   #2
vfrpilot
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You ARE kidding me right?!?!?!

No one here has any suggestions?

My search produced many mostly resistor issues... but I have NO fan... (High runs directly from batt).

I feel slight radiating heat at the defrost...but thats pretty much it
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Last edited by vfrpilot; 02-03-2010 at 07:12 AM.. Reason: stress
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Unread 02-03-2010, 07:24 AM   #3
IOUnlimited
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For a quick check, I'd pull the blower motor out (on my 05 it was a clip and a quarter turn, I think it may be different on yours, dont' know) and get a some wire. jump from the battery to the lead on the blower for a moment just to see if the motor turns (watch your fingers). If it doesn't you know its the blower, if it does you know its an issue getting power to the blower, this will help you diagnose further. There isnt' a quick way to do any of this that I know of. You're on the right track.

Items to check
Fuses - I know you've already taken that route
Blower
Switch - my switch had melted due to excessive current draw (dirty nasty fan). I could visibly see that it had melted, it didnt' take a rocket scientist to diagnose.
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Unread 02-03-2010, 07:27 AM   #4
Tonellin
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Sounds like the resistor. I've had the same problem twice, no fan power at any of the three speeds except the highest (defroster) like you said

I remember reading that you only have power on the defroster because it bypasses the resistor and is connected directly to the battery

Not sure if that is exactly correct, but it sounds like you have a bad resistor which jeeps are notorious for blowing
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Unread 02-03-2010, 07:29 AM   #5
vfrpilot
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Quote:
Originally Posted by IOUnlimited View Post
For a quick check, I'd pull the blower motor out (on my 05 it was a clip and a quarter turn, I think it may be different on yours, dont' know) and get a some wire. jump from the battery to the lead on the blower for a moment just to see if the motor turns (watch your fingers). If it doesn't you know its the blower, if it does you know its an issue getting power to the blower, this will help you diagnose further. There isnt' a quick way to do any of this that I know of. You're on the right track.

Items to check
Fuses - I know you've already taken that route
Blower
Switch - my switch had melted due to excessive current draw (dirty nasty fan). I could visibly see that it had melted, it didnt' take a rocket scientist to diagnose.
Ok, Thanks IOU !!
>>>it was a clip and a quarter turn<<<

Where's it located??
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Unread 02-03-2010, 07:37 AM   #6
vfrpilot
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No bro - I have NO fan at any speed!!!!

Quote:
Originally Posted by Tonellin View Post
Sounds like the resistor. I've had the same problem twice, no fan power at any of the three speeds except the highest (defroster) like you said

I remember reading that you only have power on the defroster because it bypasses the resistor and is connected directly to the battery

Not sure if that is exactly correct, but it sounds like you have a bad resistor which jeeps are notorious for blowing
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Unread 02-03-2010, 08:22 AM   #7
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UPDATE CONT.
Ok, just went for my morning 3 mile daily drive and while apologizing for lack of heat / explaining the prob; I twisted the fan switch and WAAA-LAAA! It worked! On all speeds?!?!?!

So, opinions suggestions and suspicions are requested guys!!!
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Unread 02-03-2010, 09:11 AM   #8
Cuder
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Fan switch is around $23 at stealership.
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Unread 02-03-2010, 09:49 AM   #9
f100ranger
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im interested too my fan wont work either but its not my switch because we bypassed it and still nothing and we pulled my blower motor out and tested it on the batterie and it worked fine, so we checked the voltage going to the plug for the blower and it was 12 volts. and im not sure what to due, not trying to hijack but i think we have the same problem
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Unread 02-03-2010, 10:21 AM   #10
vfrpilot
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Quote:
Originally Posted by f100ranger View Post
im interested too my fan wont work either but its not my switch because we bypassed it and still nothing and we pulled my blower motor out and tested it on the batterie and it worked fine, so we checked the voltage going to the plug for the blower and it was 12 volts. and im not sure what to due, not trying to hijack but i think we have the same problem
Dammm, I haven't went that far yet...
As now, my problem is intermittent
I'm still waitin to see IF the fuse in my PDS under the hood has anything to do with the blower.
And, how to test these fuses..as Ive never worked with them.
I'm mobile at the moment but I believe I have the entire rig schematic on my desktop - where I can locate & backward trace I guess?

Hang in there man, feedback is usually faster here..I dont know whats up.
The vets'll chime in sooner than later I hope.
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Unread 02-03-2010, 11:06 AM   #11
442Wrangler
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does anything else not work on the jeep? i mean electrically.

did you check the fuse under the hood? it might be jarring loose.

also is the resistor tight? are the connections to the switch burnt at all?
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Unread 02-03-2010, 11:28 AM   #12
wtroger
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Either a Bad connection in the blower switch or I have seen the blower moter get moisture in them and freeze and not turn until the engine heat defrosts them.
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Unread 02-03-2010, 11:41 AM   #13
vfrpilot
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No, not that I notice 442,
I did go to check the underhood fuse, but the tops of [fuses] faded to where I can't see into them - and the one I think is important is really in there tight - are they supposed to be? And how do you / what do you look for - check them??
I'll have to get under the passenger foot area to check the resistor..
I gotta move on this as we're expecting a storm here in 48 hours

So, now that its come back on, whats the likelihood of it being:

a loose resistor connection?

a burnt resistor connection?

a fuse under the hood?

Again, based on it now being intermittent with full (all speeds) operation????
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Unread 02-03-2010, 11:58 AM   #14
k2beach
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IMO, r2 the blower motor resistor, had same problem last month, went to 'south jersey auto supply' ($42) and got it there.

Blower Resistor Replacement
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Unread 02-03-2010, 02:18 PM   #15
Jonny Jeep
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The fact it's intermittent suggests problems with either supply or ground. Positive supply to the motor is from fuse 1 in the PDC via the blower motor relay. The coil side of the relay is grounded just below the driver side dash speaker.

The motor for all speeds is grounded, first through the resister pack for slower speeds, via the speed control switch to a ground point just below the passenger side dash speaker. Check the ground screws are secure, and see how you go.
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