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Old 11-29-2013, 03:47 PM   #1
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Vent selector works, blower turns off when defrost selected

I have an 05 TJ sport that has what appears to be an odd issue:

My vent selector/vacuum lines work and air blows out of the selected position (So no stuck in defrost problems here!). The fan speed switch works as well, except when defrost and defrost/floor are selected. The vacuum lines can be heard and air trickles out the defroster while moving, but the blower, no matter what speed is selected, stops functioning/cuts off when defrost of any kind is selected.

It's cold and snowing here, so this is bad news for visibility!

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Old 11-29-2013, 04:43 PM   #2
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That Is weird. Is the blower actually shutting off on defrost?

If it isn't id venture to guess the baffle isn't cycling all the way/to far.

Try disconecting the vacuum line under the hood and see if you get air when it's in the default.

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Old 11-30-2013, 02:35 PM   #3
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Disconnected the vacuum line. The baffle reset to defrost and blower blows until you select any defrost setting where it turns off regardless of blower speed. I wear contacts, so defrost must be turned off as soon as it's done its job. Fuses are good, so I think I'll have to pull the AC console assembly and check for corrosion.
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Old 11-30-2013, 05:55 PM   #4
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It sounds like a bad mode switch (one on the right in the panel). Easy to test if you have a meter. Pull the 3 wire connector from the back of the switch. Check for continuity between the middle & bottom terminals of the switch. It should have no continuity in the off position & continuity in every other position. If you lose it on the 2 defrost positions, the switch is bad. If that is the problem & you need a temporary fix ‘til you get a switch you can leave the connector off & put a jumper between those 2 terminals in the connector. That will allow you to still have the 4 fan speeds with the speed control knob. However the a/c compressor won’t come on which it normally does for defrost. If you also jump from bottom to top the compressor will be on but constantly until you turn the key off of pull the jumper. The fan will also still turn off when the key is off so that should get you by ‘til you can get a switch which is available from parts stores or online.
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Old 12-09-2013, 12:31 PM   #5
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Now that final's are done!

I pulled the A/C controls out and saw visible damage to the vacuum selector switch at the 3 wire connector. The plastic had melted around the prongs and deformed the switch! The warped side kept the clamps on the side of the switch from being fully seated. I disassembled the switch, cleaned off and aligned the contacts and JB Welded/clamped everything flush until I feel like getting a new switch. Baffle cycles through all positions and the blower works in defrost! THANK YOU FOR THE HELP!

But now it blows when the vacuum switch is set to off. So long as that isn't a sign of something terrible, I can let it slide for now!
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Old 12-09-2013, 12:54 PM   #6
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That shouldn’t be a problem. The switch is probably bad & the a/c compressor may or may not be staying on as well but everything should go off when the key is off so probably OK for now. Those switches for ‘05s may not be available from the dealer now & I haven’t seen any for ‘05s in the aftermarket. They say the ’04 & earlier are different so you may have some searching to do.
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Old 12-09-2013, 02:46 PM   #7
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The AC compressor toggles when I put it in defrost now too. I can notice the added load on the engine when idling. Time to hunt down the replacement!

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