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Old 02-05-2013, 10:59 PM   #1
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Blower Motor problem '99

I did some searching through the forum, and found some similar problems, but nothing completely the same. Excuse as this is most likely a repeat.

I saw many references to the relay. I'm not sure which relay, and I'm not sure that the relay may be my problem and I don't have any service manuals and couldn't find anything in the owners manual about the relays..

I have no power to or from the blower fuse.
I have no power to any wires from all ?3? plugs to the panel with the blower switch.

I can put power to the fan and kick it in.

I have recently replaced the resistor block and the vacuum switch in the dash. (don't think this affects my current problem)

Any ideas where to look?

I'm pretty good with mechanics and electronics..

Thanks

Andrew

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Old 02-05-2013, 11:39 PM   #2
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You should be getting power to only 1 wire in the 3 connectors to the panel switches. That is the red/dark green wire in the blend door temp control switch (middle one). That power comes from the #8 fuse in the block behind the glove box when the key is on. That wire also powers the coil in the relay & the blend door motor. If there is no power there the relay can’t work so the relay is not the problem. Then the relay gets primary power from the #11 fuse in the PDC in front of the battery. The blower speed is controlled on the ground side of the circuit. If you jump power directly to the blower & it works & you can control the speed with the mode switch not off & turning the speed switch gives you all 4 speeds, the ground circuit is OK.



Here is a link to FSMs that may help.

See online read only FSMs here:
Jeep Knowledge Base
You may have to go to the bottom of the page & pick Jeep Resources & online manuals if it directs you to home page rather than the knowledge base.

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Old 02-07-2013, 12:58 PM   #3
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Ok, I swear I didn't have any power to the plugs or fuse yesterday, I guess I had the off or something. Anyway. I have power on the wire you mention, and to others when the fan is turned on. I now have power to the plug on the fan, but no ground on that plug. when I put + and - to the fan it spins. I have a ground problem? any ideas where to look?

Thanks

Andrew



Quote:
Originally Posted by RUBI 4 MY MRS View Post
You should be getting power to only 1 wire in the 3 connectors to the panel switches. That is the red/dark green wire in the blend door temp control switch (middle one). That power comes from the #8 fuse in the block behind the glove box when the key is on. That wire also powers the coil in the relay & the blend door motor. If there is no power there the relay canít work so the relay is not the problem. Then the relay gets primary power from the #11 fuse in the PDC in front of the battery. The blower speed is controlled on the ground side of the circuit. If you jump power directly to the blower & it works & you can control the speed with the mode switch not off & turning the speed switch gives you all 4 speeds, the ground circuit is OK.



Here is a link to FSMs that may help.

See online read only FSMs here:
Jeep Knowledge Base
You may have to go to the bottom of the page & pick Jeep Resources & online manuals if it directs you to home page rather than the knowledge base.
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Old 02-07-2013, 01:32 PM   #4
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aha..

ok, the brown/tan is the ground control wire. when I ground this out, I get one fan speed, multiple speeds when I ground out the other wires going into the resister block.

I have ground on the Green wire in the plug in the dash. used my trusty ohm meter on the switch from the green pole to all others through various speeds and I got nada. sounds like bad speed selector switch..

A
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Old 02-07-2013, 04:01 PM   #5
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If you are sure the green wire is grounded then you are right, the speed switch must be bad. Usually all speeds don't go out in the speed switch at the same time but it could happen. To be sure remove the (3 wire) connector at the mode switch & jump between the green & black wires. Now try the speed switch. If you now get all 4 speeds the mode switch is bad. Carefully check the wires at the connector for excessive heat &/or melting. More times that connector is bad than the switch being bad so check that carefully.
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Old 02-08-2013, 10:25 AM   #6
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It was a switch.

I was also able to duplicate my no power problem.
the plug on the right side with 3 wires (I guess) goes to the relay. when it is not plugged in I don't get power or ground.. While bending the thing all around to hit it with the test light and meter I guess the plug came a little loose. I was successfully able to jumper from green to the other wires and get different fan speeds.

I hear you on all speeds going out being very strange. even more strange, I took the switch apart and it didn't look that bad, cleaned it up, put it back together and still didn't work. I recently replaced the knob on that switch, I probably bent stuff up inside there pushing the knob on too hard.. I had a problem putting the new knob on in the dark. had to get a flashlight before I noticed the metal sleeve from the old knob was still on the shaft..

A

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