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Old 01-17-2013, 03:43 PM   #1
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Question HVAC blower switch lost detents?!

Why can't this happen in May?! I can no longer turn on the blower for the heat. It seems to have lost the detents; switch just whirls from low fan to high position without locking in. And none of the positions activate the blower, not even the high. Brrrr!

I checked the simple stuff: 10a Fuse behind glovebox checks out fine. Relays under the hood seem ok. I pulled off the switch and its not broken or spinning on the axis - its moving the axis its coupled to.

Has anyone experienced this?

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Wish I went wheelin' but no. Mostly take my toddler around on highways and tow the Jeep behind my RV (toad).
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Old 01-17-2013, 05:49 PM   #2
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UPDATE: I have the high speed blower back, and the position detents, but not the lower blower speeds, 1, 2, or 3.

I took the instrument panel front off and unplugged the wire harness from the back of the blower switch. It looked clean but I wiggled it back and forth after I plugged it back in. Even without power I could feel the detent switch positions had returned. Weird. When I put it back together and turned on the ign switch, I got it to blow on high speed! <golf clap>

At least now it seems to resemble some of the symptoms of other posts. And now I can make the long commute to work tomorrow without shivering to death!

Any input would be appreciated though. Taking it to the shop is such a pain...

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2004 TJ Sport, 2.5L manual
31x10.5 BFG T/As on 15x8 Ultra Drifters (ordered, not on yet )


Wish I went wheelin' but no. Mostly take my toddler around on highways and tow the Jeep behind my RV (toad).
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Old 01-17-2013, 06:47 PM   #3
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Sounds like what happened to me. The switch melts on the inside and the metal tab connectors move out just enough to not make a connection. Unfortunately you will need to buy a new switch. I recommend rockauto.com.
KnoxOffroad - View topic - Blower Speed Switch Melted? Fix IT!
The above is a link to a writeup I did to add relays for all four positions. There is a writeup on wranglerforum somewhere to add a relay to one speed. The linked writeup is my first so forgive me if I made any mistakes but it fixed my problem.
Also, you can always run the blower without the relays until you have time to do a relay setup but you run a risk of melting the new switch as well.
Hope this helps!
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Old 01-17-2013, 06:50 PM   #4
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Yep .. The fan motor wears and draws current the system can't handle. Eventually wires/switch burn up. Very common.
Actually the very first google search that led me to this forum

FYI- speeds 1/2/3 are through the resister.
4 is direct to the battery.
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