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Old 02-09-2014, 04:10 PM   #1
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Blower not wirking in high

He blower on my 98 wrangler will not work on high. I have checked all the fuses and they are good. I do have the lower 3 speeds so I know it's not the resistor. Any ideas?

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Old 02-09-2014, 04:13 PM   #2
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Go to daveys jeep and look on parts specials. It's a 20 dollar fix.
Jeep Wrangler Heater Problems?? If your fan only works on low or maybe high this is probably the cause. Heater Blower Resistor. Fits 2002-2006 Wranglers. New OEM part. $20 SALE

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Old 02-09-2014, 04:14 PM   #3
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Sorry didn't see you had a 98
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Old 02-09-2014, 04:17 PM   #4
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First check the connector on the back of the switches for melting and/or a bad connection. If that's okay it's most likely the speed switch.
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Old 02-09-2014, 04:27 PM   #5
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Yeah I was thinking the speed switch itself too. Thanks for your help
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Old 02-10-2014, 12:52 AM   #6
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On 98s the relay is closed for high speed & gets power from fuse 11 (40a) in the PDC. Meter check or swap fuses to be sure it is good. Then remove the 5 wire connector on the back of the speed switch & with the key on jump between the dark green & the brown/tan wires. That should close the relay & give you high speed if yes then the speed switch is bad.
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Old 02-10-2014, 08:41 AM   #7
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Originally Posted by RUBI 4 MY MRS View Post
On 98s the relay is closed for high speed & gets power from fuse 11 (40a) in the PDC. Meter check or swap fuses to be sure it is good. Then remove the 5 wire connector on the back of the speed switch & with the key on jump between the dark green & the brown/tan wires. That should close the relay & give you high speed if yes then the speed switch is bad.
Good info, I wasn't aware there was a change between 98 and my 99...thanks.
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Old 02-10-2014, 02:41 PM   #8
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Yes, the '97 & '98s have completely different circuits from the later ones. They control the blower speed from the + side of the circuit & only use the relay to bypass the resistor for high speed.
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Old 02-15-2014, 02:32 PM   #9
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Fuse is good. Jumped the wires and still no high, but did find the relay (it was clicking when jumped). Thought it might be the relay but that relay controls all the speeds. Could it be the resistor even though I have the lower speeds?
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Old 02-15-2014, 02:48 PM   #10
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The relay only controls the high speed. If you have a probe type test light, ground the clip, then check for power on the red/light blue wire at the relay (with ignition on and speed control set to high). If you have power there, check the dark green wire for power at the relay. If you have power on the red/light blue, but no power on the dark green, check for power on the brown/tan wire at the relay. If you have power there, and you are sure that the black wire has a good ground, replace the relay.

If you don't have power on the Brown/tan wire, then either the switch is defective or there is a connection issue at the switch.
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Old 02-15-2014, 03:06 PM   #11
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Thanks. I will check it out and let you know
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Old 02-15-2014, 03:36 PM   #12
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If you read my 2 posts above you will see that for '98 the relay does not really control all the blower speeds, at least not in the normal way. It switches the NC & NO contacts from NC to the NO contact when on high which then bypasses the resistor & also gets its power from fuse 11 (40a) in the PDC. When on the lower 3 speeds the power comes from fuse 8 (20a) in the fuse block & through the NC contact. So it is possible that the relay is bad (or fuse 11). It should click when going from high to any lower speed (if the speed switch is good). When you hear it click it may be closing to the NO contact but that contact could be bad & no power would get through for high speed if that happens.

Go to the link below to see the FSM & in the heat & a/c section of the wiring chapter on page 4 you can see how it works.

See online read only FSMs here:
Jeep Information Center, Jeep Parts Catalog, Jeep Repair Manual & More
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.
Pick your model & year then on the drop down menu pick the chapter you need.

In that diagram look at the blower motor relay. The #3 terminal is the NC one for speeds 1-3 & the #4 terminal in the NO for high speed (which closes under power from terminal #5). From there you can try jumping from terminal 1 (probably labeled 30) to terminal 4 (probably labeled 87) to see if that gives you high speed. If yes then the relay is bad.

Edit: Typing while WD was posting.
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Old 02-15-2014, 03:38 PM   #13
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Power at the red/blue
No power at green/yellow
Power at the brown/tan

So it's the relay then. I checked auto parts stores and they have them for 20. But found a few online that say they have them pulled from new wiring harnesses for 5.
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Old 02-15-2014, 03:41 PM   #14
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Jumping 30 to 87 does engage the blower. I was thinking you could jump it but didn't want to blow up anything either. Thanks for your help in finding the problem

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