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Old 08-23-2012, 12:22 AM   #1
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Heater switch issues. HELP!!

Ok, so I saw a blog talking about switches and relays causing heat/ac issues. My problem is along these lines. My Jeep is a 2002 Wrangler 5 speed, 4.0 liter. My heat and AC worked until about a month ago but the air only came through the defrost vents and not any others. The switch turned (vent changer), but no change. Now my switch (far right selector switch) doesnt move, its locked in place. No air blows at all now and nothing works. I can turn the temp switch to hot and can feel some warmth out of the defrost vents but with no air pressure. Does this sound like a relay? switch? whole switch assembly? cracked hose??? Any suggestions would really be appreciated. Thanks in advance.

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Old 08-23-2012, 12:31 AM   #2
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My only other issue with my 2002 wrangler (4.0) is a noise after my Jeep warms up on the road for around 25 minutes. Its a very high pitch wine. Now heres the kicker. If I am stopped at a light, the sound is loud, but then as soon as I accelerate, the noise disappears until I shift/or go neutral in any form. I thought it may be the belt, but that had no effect. Could it be an idler bearing? The noise is so annoying/loud that there is no way to determine the origination/location of the sound. Any suggestions? Anybody ever heard of this problem before? Im tempted on videotaping the Jeep after the noise starts so I can post on youtube for help.

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Old 08-23-2012, 09:33 AM   #3
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Just bumping this up so when the guys get on today they won't miss it :-) good luck. Hope someone has some ideas for you.
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Old 08-23-2012, 11:18 AM   #4
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Look at this vaccum line coming from your firewall right next to the ac and heater lines. Look for breaks in the line, this is what controles where the air gets sent to in your jeep. If there is a break in the line it automaticly switches to defrost. My vaccum line has a blue plug on it that's where my hose was broken, yours will have a line on that side going to the ac compressor.
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Old 08-24-2012, 11:16 AM   #5
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x2 on vacuum leak for your heater control issue. You could validate by spraying carb cleaner around your vacuum lines, if your RPMs change - then you have a leak
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Old 08-24-2012, 11:23 AM   #6
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Pop the knob off and check if it's cracked where it mounts. It may be just spinning on the switch shaft. I replaced all of mine with metal ones.
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Old 08-24-2012, 08:32 PM   #7
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Help!!

Thanks for the Help Jeepsters. Although I have to work until Monday, I'll take a close look and see what I can find per your suggestions. Regarding the broken knob, I was hoping it would be that easy, but thats not it. I'll keep you posted as to if I find anything. Thanks again.
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Old 08-27-2012, 05:43 PM   #8
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Damn!!

Ok My Jeep freinds, I did as suggested. I dont have a broken switch so the switches turn fine. I tried the carb cleaner trick to see if I could find a vac leak. The only success I had was the box under the battery. I can see it, but when I felt around I found the hose was NOT connected and the end of the hose has a split. I cut off an inch of hose and reconnected with a good fit to stop the air leak. After that my hopes were high, but then...............nothing. I checked the fuses even though that wasnt a suggestion, all were fine. I took out the glovebox and saw nothing unhooked or out of the ordinary. And the wiring to the far right switch looked fine. Any other suggestions besides going to a mechanic??? I would rather pay a Jeeper to look at it and pay a few cases of beer than to pay a mechanic. I look forward to any other help.
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Old 08-29-2012, 06:35 AM   #9
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It could possibly be the whole switch assemble. Amazon has one for $90. It looks easy to change out. My fan switch is hot to the touch on my 02. I think the contacts may be arcing and getting ready to fail.
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Old 09-05-2012, 11:08 PM   #10
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Thanks!!!

I think my next step is going to be to replace the switch. As I mentioned before, I found an unconnected hose in the "box" behind my right front wheel. Before I fixed this, warm air would come from the defrost vents but of course without any fan pressure. But the heater was obviously creating some kind of heat. After I fixed and reconnected that hose to the "box", now I have NO warmth whatsoever. What is that box for? and when the hose is reconnedted, why no more warmth from the defrost vent????? Any ideas?
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Old 09-06-2012, 02:12 PM   #11
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I think that's a vacuum holding tank. Is the check valve working correctly ?
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Old 09-06-2012, 10:34 PM   #12
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The what?????

Unfortunetely I've not had a lot of mechanic experience. So I have no idea what/where the check valve is. If you tell me what its for I can typically figure it out, but at the moment I have to claim ignorance. So if this is a vacuum holding tank, then when connected what is happening regarding the no heat thing?
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Old 09-07-2012, 12:13 AM   #13
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It's actually called vacuume Reservoir
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Old 09-07-2012, 12:14 AM   #14
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Unfortunetely I've not had a lot of mechanic experience. So I have no idea what/where the check valve is. If you tell me what its for I can typically figure it out, but at the moment I have to claim ignorance. So if this is a vacuum holding tank, then when connected what is happening regarding the no heat thing?
try replacing the switch, or barrow one out of a buddies jeep to test it, if the switch/know if frozen in place and wont turn thats a problem, you should address first, second their is 2 solenoid plungers on the right side of the center console under the dash, above the gas pedal those control the blend door and mode door, those operate on vacuum they should move when you turn the far right selector through the modes and the other with the turn of the temp knob, third would be the blower motor, since it blows something the relay and fuse are good, it uses a blower motor resistor behind the glove box bolted into the blower box with 2 small bolts. hope this helps
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Old 09-07-2012, 12:17 AM   #15
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It holds a constant vaccume The vaccune
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Old 09-08-2012, 12:30 AM   #16
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Thanks Guys!!!! Ill have another go at it this weekend after I get off work. And Scooby, I see you live in Wilsonville, Im in Oregon City. Maybe I could meet you for lunch on me and you could show me what Im looking for.
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Old 09-08-2012, 09:01 AM   #17
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I think Scooby is off camping this weekend. He posted something on facebook about sleeping on the ground in sleeping bags LOL
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Old 09-08-2012, 09:23 PM   #18
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I think Scooby is off camping this weekend. He posted something on facebook about sleeping on the ground in sleeping bags LOL
Thanks for the info "SW". I dont blame him, the weather has been perfect.
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Old 09-09-2012, 01:32 PM   #19
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hEY sCOOB, WHEN YOU GET BACK, LET ME KNOW. aS YOU HAD MENTIONED, THE FAR RIGHT SELECTOR SWITCH IS STUCK AND DOESNT MOVE, IS THIS TELLING ME THERES A BIGGER PROBLEM THAN JUST THE SWITCH?
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Old 09-09-2012, 07:47 PM   #20
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hEY sCOOB, WHEN YOU GET BACK, LET ME KNOW. aS YOU HAD MENTIONED, THE FAR RIGHT SELECTOR SWITCH IS STUCK AND DOESNT MOVE, IS THIS TELLING ME THERES A BIGGER PROBLEM THAN JUST THE SWITCH?
more than likely your control unit if stuck, and you can't turn it you need to replace the head unit.. this may fix all of the problems, or it may be just one of them it is the best place to start but they aren't cheap
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Old 09-10-2012, 01:18 PM   #21
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Fixed!!!!

Well, thanks to you all, my Heater/AC is fixed. Besides the disconnected hose from the vacuum box behind the passenger wheel, I realized the knob (although it doesnt appear it) for the seletor switch is broken. I thought the switch was frozen in place until I used pliers to turn it and SURPRISE, it works. Thanks again everyone for the info. I wouldnt have gotten it fixed without you guys.
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Old 09-10-2012, 05:40 PM   #22
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Good to know it wasn't an expensive fix.
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Old 09-10-2012, 09:05 PM   #23
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that happen to mine so i bought plastic replacements and the same thing happen again, so i bought the polished metal ones
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Old 09-10-2012, 09:41 PM   #24
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X2 on the metal ones! Shop around before you buy, I found them cheaper on eBay a month after purchasing from Quadratec.
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Old 09-10-2012, 10:42 PM   #25
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X2 on the metal ones! Shop around before you buy, I found them cheaper on eBay a month after purchasing from Quadratec.
Good to know, Ill look there first, but I do plan to buy the metal ones.
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Old 10-29-2012, 12:15 PM   #26
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Heater control issues

2007 Jeep Wrangler Unlimited, only heat through dash vents, able to select everything else except defrost. Is it a vacuum or a switch issue? Also how to get switch out.

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