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Old 02-01-2013, 08:06 PM   #1
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Heater won't work

I have a 98 Wrangler, 2.5, 5 speed, and recently the heat has not been working right.

It works sometimes, but other times it won't turn on at all (blower doesn't run). When it does work, it only works on high.

Replaced the resistor, and still no luck. Fuses are good. Where should I look next?

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Old 02-01-2013, 08:27 PM   #2
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I am by no means an expert in this but a lot of issues have to do with the vacuum line. Unsure if it only blows on high because it forces enough air through or if it even blowing rules that out.

Again by no means any mechanic or anything, just offering the advice of checking the lines.

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Old 02-01-2013, 08:33 PM   #3
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Im pretty sure that when it does blow it only blows on high was the work of the bad resistor (which is now replaced). So, when it does decide to turn on I assume it will work on all 4 settings, but the question is why will it not work all the time...
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Old 02-01-2013, 08:39 PM   #4
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blower motor?
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Old 02-01-2013, 08:40 PM   #5
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I don't think the motor is bad because it does blow sometimes...
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Old 02-01-2013, 08:49 PM   #6
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Quote:
Originally Posted by uglyassredjeep View Post
I don't think the motor is bad because it does blow sometimes...
Unfortunately then I am thinking possible electrical gremlin, HVAC Control unit in the dash is possibly going bad, or as the other guy says, the vacuum lines, I will see if I can find the diagram that shows which vacuum hose is famous for coming loose
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Old 02-01-2013, 08:52 PM   #7
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You replaced the resistor pack or the relay? The resistor pack is what controls the speed. When on high, a high speed relay is energized and the resistors are bypassed. Usually when a blower only works on high it is a bad resistor pack.
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Old 02-01-2013, 08:57 PM   #8
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Vac lines do not affect the motor. They control the doors for the vents.
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Old 02-01-2013, 09:11 PM   #9
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You replaced the resistor pack or the relay? The resistor pack is what controls the speed. When on high, a high speed relay is energized and the resistors are bypassed. Usually when a blower only works on high it is a bad resistor pack.
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Vac lines do not affect the motor. They control the doors for the vents.
His resistor is brand new (could be possible dud but doubt it) and i realize the vac lines don't affect the blower motor, however, I've learned, anything can happen haha!
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Old 02-01-2013, 09:33 PM   #10
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I realized he said he replaced the resistor, and asked if he replaced the relay thinking that was the resistor pack. Resistor packs have one resistor for each speed under high. If it does have a new resistor pack then it is probably the control head.
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Old 02-01-2013, 09:39 PM   #11
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FWIW I had to replace motor in my '04 TJ about 2 years ago.....heater motor would come on and work fine randomly...when it didn't come on a kick to the motor housing would usually get it started.

After motor replacement now I have no more issues with that...when motor starts going bad it draws more current and that overloads the electrical and burns up, resistor packs and burns switches IMO........Good Luck!!
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Old 02-03-2013, 04:13 PM   #12
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Where is the rely?
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Old 02-03-2013, 04:41 PM   #13
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Where is the rely?
Not 100% sure but behind the glove box down lower then the fuse box there's a relay atleast in my moms 01 not bositive if it goes to heater but its in that area so I'm assuming it would

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