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Old 02-16-2014, 09:57 AM
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BooDie1821's Avatar
Join Date: Feb 2014
Location: Jersey Shore
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Another Heater Issue

Hey guys-

sorry for making yet another heater thread... i couldnt find an answer in the others.

i have a 2000 4.0 w/out AC. Heater is not working at all, no air coming from vents on any speed. Blower is not blowing.

i assumed the blower motor was the issue and replaced it, still nothing. i checked the fuses and they seem to be fine.

what should i do next? do you think its the resistor? maybe the switch itself?

im lost here!

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Old 02-16-2014, 11:32 AM   #2
Mostly old school..!

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Location: Now searching for rocks in Sumner, TX
Posts: 12,149
Get a test lead with a couple of alligator clips, (or alligator clip and probe..a nail works) and first clip one end to a known good ground. Clip or probe the other end to the black wire in the two wire connector on the back of the switch, turn on the ignition and the heater and see if it works. If it does, you have a bad ground. If that doesn't do it, leave the clip on the known ground and probe the other end on the dark green wire in the 5 wire connector on the back of the switch and try again. If it works the problem is the mode switch. If it doesn't work probe the brown/tan wire in the same connector (with your grounded lead) and try again. If that works, it's your speed switch. Also check your connections first.

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Old 02-21-2014, 06:38 PM
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so apparently i had multiple heat issues. after replacing the blower motor and fuse it still didn't work, so i tested the switches. mode switch was bad so i replaced the entire cluster just to be sure.

now i have heat!! but only on the highest fan speed

this has to be the resistor correct? i feel like its abnormal that my jeep had 3 issues with the heat system... maybe there was an electrical surge at some point.
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