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Old 08-05-2010, 09:07 PM   #1
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Not the usual A/C question...

A few weeks back, the blower fan on my 2000 TJ would intermittently quit working on all speeds. It started out only doing it for a few seconds, and progressively got worse to the point where I could begin to locate the problem by wiggling wiring & connectors. Finally found it for sure when it failed the smoke test. The mode switch and the 3-wire connector that goes into it are fried. Upon studying the wiring diagrams, I've figured out that the blower motor ground goes through this switch, as does the A/C request signal. The purpose of the switch is to provide ground for the A/C request signal, and the blower ground goes through it so that the blower is disabled when you turn the mode switch to the "OFF" position. The mode switch, apparently, is only sold as part of the control head. The bigger problem, however, is that the local dealer (not the most reliable dealer I've run across) says the connector I need is discontinued. Being that the control head will do me no good without the connector, I've been trying to locate the connector first. I've had no luck at the local pick-n-pull yards, and also no luck with the local parts stores. For the time being (and quite possibly permanently), I've jumpered the two large wires together to bypass the heavy current that goes through the switch, leaving the one that goes to ground connected to the switch so the A/C request signal still gets through. This works fine, except that the blower motor runs all of the time whenever the ignition switch is on... in other words, it all works normally except that there is no way to turn the blower completely off as long as the ignition switch is on. I can live with this, but I'd rather have it working the way it was designed.

So, after all of that, my question is...

Does anybody have a part number or a reliable source of where I can find this elusive 3-wire connector that goes into the mode switch?
Doug Coleman

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1999 Z-28 - "The GLUMAKR" - Not Stock

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Old 08-05-2010, 09:18 PM   #2
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Sorry...I'm in a hurry and can't search it for you, but there's a how-to posted around here somewhere with photos of that exact problem and a fix for it.

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Old 08-05-2010, 09:44 PM   #3
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Old 08-05-2010, 10:08 PM   #4
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If you can't find it, which I couldn't, I cut the three wire connector off, broke it open and brought one of the female spades to Carquest. They had an exact match (about 3 bucks for a box). I made a pigtail with them, some short wire lengths and solder. ( make sure you use the right gauge, 12 for the fan and ground and I think 18 or 20 for the light green a/c wire). Make sure they slide onto the mode switch tabs nice and tight. then wrap each with electrical tape because theres no more plastic between them. So far so good, its been about 4 months.
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Old 08-05-2010, 10:25 PM   #5
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