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Old 02-05-2012, 07:23 PM   #1
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Smoke from the heater vents HELP!

I was teaching my girlfriend how to drive stick shift today and after we switched back, I drove home. We were at a stoplight and I saw smoke coming out of the two heater vents above the radio. I immediately shut off the engine and put on my flashers and checked my gauges. They were fine, no check engine, the temp was normal and oil pressure was fine. I am wondering what the hell the smoke came from and why??? While I was teaching her she had the parking brake on without me knowing for a couple runs going into first gear, but we switched and the incident occurred later on way after we had switched. Anyone know why it would be smoking??

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Old 02-05-2012, 07:30 PM   #2
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Does you heater fan still work on all speeds? It could be the resistor burnt up?

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Old 02-05-2012, 07:30 PM   #3
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Check your blower motor resistor. I haven't heard of these smoking but from what I saw of mine (it was already not working when I bought the jeep) I could imagine it could smoke
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Old 02-05-2012, 07:30 PM   #4
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Clutch?
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Old 02-05-2012, 07:38 PM   #5
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All speed settings work. Ever since I bought the jeep the leg vents seem to just default to defrost. But yes, all heater vents still work. Just freaked me out.
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Old 02-05-2012, 07:50 PM   #6
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how much and what kind

There should be only 2 ways that smoke can come from the heater vents. Either there is something inside the ducts causing the smoke (resistor or fan motor) or the smoke is entering the fresh air intake.

I would agree that it is probably the heater resistor. Shouldn't be the fan motor as that is outside the ducts.
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Old 02-05-2012, 08:06 PM   #7
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It wasn't a lot, but enough to freak me out, it reminded me of the smoke that would come from the side of a cigar/cigarette. streamy, and it had an odor.
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Old 02-05-2012, 08:10 PM   #8
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heatercore maybe?
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Old 02-05-2012, 08:13 PM   #9
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Is this jeep new to you? I had a friend that this happened to and he had a bunch of leaves and what looked like a squirrel nest in his vents that actually caught fire and smoked him out of the truck.
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Old 02-05-2012, 08:23 PM   #10
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I've had the jeep for about 2 months now. How do I check the heatercore?
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Old 02-05-2012, 08:28 PM   #11
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Does your Jeep have a/c? I had something like this happen once but it involved the a/c compressor.
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Old 02-05-2012, 08:30 PM   #12
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Yes, it has A/c, but I haven't ran it yet.
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Old 02-05-2012, 08:55 PM   #13
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The reason I asked about the a/c is this, I was driving my '01 last summer, no top or doors with the a/c switch in the off position and the blower not running. My passenger noticed white(ish) whispy(like cigarette) smoke coming from the vents(upper). The problem was that the a/c compressor clutch was engaged even though the switch was off. The evaporator was freezing up without the blower running, and high Texas humidity. I haven't noticed it ever happening since then but now I always leave the blower running no matter what.
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Old 02-05-2012, 09:17 PM   #14
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I'm not sure if your Jeep has the same issue as mine did, but it was very unusual. What did the smoke smell like? If it's the heater core it will smell like antifreeze. The smoke coming from mine didn't have a noticeable smell.
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Old 02-05-2012, 09:23 PM   #15
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That sounds similar. My heater was not blowing and totally in the off position. I make it a habit to always turn it to off before turning off the vehicle.
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Old 02-05-2012, 09:38 PM   #16
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Did the smoke smell like bruning leaves, fuel or oil products, or sweet smelling? The smell with much better narrow it down. Also it is a good idea to run the A/C or defrost once a month if you have a compresser just to move the lubricant inside it a bit.
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Old 02-05-2012, 09:42 PM   #17
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Was it smoke or steam?
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Old 02-05-2012, 10:50 PM   #18
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If i had to put a label on the smell it would be slightly sweet
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Old 02-05-2012, 11:36 PM   #19
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Sounds like an old fashioned Heater core gone bad if it's sweet smelling.

Easiest one I ever replaced was in the 65 comet.
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Old 02-05-2012, 11:43 PM   #20
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Quote:
Originally Posted by Fawbio72 View Post
If i had to put a label on the smell it would be slightly sweet
I know some antifreeze tastes sweet, but to me it just smells like antifreeze. Anyway, if you think the problem is the heater core, keep an eye on your coolant reservoir under the hood, if you are losing coolant you should notice the level dropping.
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Old 02-06-2012, 01:28 AM   #21
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Let us know if you tackle the heater core, what kind of nightmare it is to do...
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Old 02-06-2012, 01:59 AM   #22
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If it's the Core, (sounds like it to me) you may not notice a drop in coolant level in the overflow or Radiator. A slight seepage in the Core will give the symptoms your describing. Just enough to dampen the exterior of your Core is enough to cause the symptoms. Keep a close EYE on the Passenger Floor, under Glove Box, upper edge of Carpeting, for ANY Dampness. If it is the Core, it's a NIGHTMARE to replace. The Entire Dash has to be removed. Not a Job for the Squeamish or low end Novice.
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Old 02-06-2012, 06:43 AM   #23
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Heater core
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Old 02-06-2012, 07:12 PM   #24
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I don't notice any dampness yet. Is it safe to drive? What does the heater core do exactly? And, what will happen if I keep driving on it.
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Old 02-06-2012, 07:15 PM   #25
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Quote:
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I don't notice any dampness yet. Is it safe to drive? What does the heater core do exactly? And, what will happen if I keep driving on it.
its safe to drive, keep an eye on coolant level, wont drop that fast... the heater core is whats used to produce heat in the cab
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Old 02-06-2012, 07:17 PM   #26
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Clutch?
x2 learing to drive a stick? easily possible
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Old 02-06-2012, 07:23 PM   #27
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Your heater core has engine antifreeze run through it, and is what transfers heat into the vehicle via the HVAC system. It is enclosed in a plastic housing near the fan that blows air through it (heating it) and then it blows out the vents.

If you keep driving it, the worst case scenario would be that it starts leaking more and more, letting coolant into the vehicle. I've never heard any stories of REALLY bad heater cores, but eventually it could start leaking/running all over the place i suppose.

A temporary "hack job" fix would be to disconnect the lines running into and out of the heater core under the hood and bypassing the heater core all together. If this was done you would no longer have any interior heat, and it would probably be easier to fix once you wanted to fix it right. However, It would cost about 5 bucks and take maybe 20 minutes as opposed to many hundreds of dollars and many MANY hours.
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Old 02-06-2012, 07:24 PM   #28
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Quote:
Originally Posted by Fawbio72
I don't notice any dampness yet. Is it safe to drive? What does the heater core do exactly? And, what will happen if I keep driving on it.
It is all right to drive assuming it's the heater core but keep an eye on the floor and make sure u don't get a big puddle of coolant and check the coolant level
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Old 02-07-2012, 07:16 PM   #29
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Coolant level is consistant, Just under full when not running or hot, at full when hot.
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Old 02-07-2012, 07:30 PM   #30
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Here is what happened to me
Years of leaves and crap were stick in the intake tube from the cowl.
It caused a small fire and there was smoke through the vents.
Hope this helps



Dammage from the fire


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