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Car Forum / BMW Cars / April 2009Smoke from air vents when I turn on the A/C
I just acquired a 1995 525i. I turned on the A/C, but didn't feel any cool air. After about 5 minutes, smoke suddenly started spewing from the vents. So I shut down the A/C and fan. I didn't see anything else wrong, so I continued driving home. I could still smell the smoke on me later. I don't see any fluid (athough I do have a oil leak from the valve cover gasket and have been smelling that as it's evidently dripping on something hot). Thoughts? >I just acquired a 1995 525i. I turned on the A/C, but didn't feel any >cool air. After about 5 minutes, smoke suddenly started spewing from [quoted text clipped - 6 lines] >cover gasket and have been smelling that as it's evidently dripping on >something hot). Odds are it's your blower motor burning up. A combination of moisture in the windings over the years causing the insulation to break down, and the motor being dragged down by bearings that haven't been lubricated will cause the motor to overheat and smoke. Once it's done this it's too late to clean and lube the bearings, it's usually time to replace the motor. Sometimes it'll make squealing noises for a while before it goes, sometimes it just goes. I don't know how hard it is do to on your vehicle... on some models of that era it's very easy to get to the AC fan and on others it is a nightmare involving removing the dash. The other possibility is the resistor pack.... but that usually produces only a little puff when it goes, and afterward the fan will work only on high speed, or it cannot be turned off, or something like that which is clearly related to the speed control. --scott  Signature"C'est un Nagra. C'est suisse, et tres, tres precis." it could also be from an accumulation of dust and debris in the housing . a blower motor usually gives out sounds before it quits . have you tried leaving it on at max speed for 15 - 30 minutes and see if it stops smoking ? at this point , you have nothing to lose by trying this . it's one of the last things in your car you want to replace . it cost SERIOUS $$$$$ . HTH , D. >I just acquired a 1995 525i. I turned on the A/C, but didn't feel any > cool air. After about 5 minutes, smoke suddenly started spewing from [quoted text clipped - 8 lines] > > Thoughts? > it could also be from an accumulation of > dust and debris in the housing . [quoted text clipped - 24 lines] > > - Show quoted text - ouch. I think it's burnt. I still get the burnt smell even though I've kept it off. >ouch. I think it's burnt. I still get the burnt smell even though >I've kept it off. Get a replacement from the dealer for around $50, and then get the Haynes manual and see about changing it. As I said earlier, on some models it's very easy to do, and on some models it's very difficult, and you won't know which until you try it. --scott Signature"C'est un Nagra. C'est suisse, et tres, tres precis." in article a62b26a3-2141-4dc1-bc2d-fff44de96c33@v15g2000yqn.googlegroups.com, cowznofsky at jhcorey@yahoo.com wrote on 4/13/09 4:10 AM: > ouch. I think it's burnt. I still get the burnt smell even though > I've kept it off. the smell is in the heater/condensor core ... the outside air passes through it with the heat or the A/C on ... and the back fire tainted the heat exchanger ... put burnt oil film on it. There is condensor cleaner for the A/C to take smells out of it .. some actually clean .. others just put a better smelling oil on it. If you take it in for service for the A/C if you do that ... they might be of help. sumbuddie wear blind sea > in article > a62b26a3-2141-4dc1-bc2d-fff44de96...@v15g2000yqn.googlegroups.com, [quoted text clipped - 14 lines] > > sumbuddie wear blind sea Hmm. Maybe so. It's in the shop right now for the oil leaks, and they say that the blower motor is ok. >Hmm. Maybe so. It's in the shop right now for the oil leaks, and >they say that the blower motor is ok. AHA! You didn't mention that the car had an oil leak. IF the engine has an oil leak near the top, and it spills oil onto the exhaust manifold, it will make a lot of smoke in the engine compartment. Leaky valve cover gaskets are popular sources of this. If you have the heat or AC on and it's set to take in outside air, it will take in smoky air from the engine compartment. If this is the case, though... you'll also see smoke from the engine compartment... just little wisps. And the REAL thing is that the smell will be a burning oil smell, not a burning plastic kind of smell. Very different smell, and the mechanic should be able to sniff the residual odor and let you know. --scott Signature"C'est un Nagra. C'est suisse, et tres, tres precis." > A! You didn't mention that the car had an oil leak yeah ... if you are ever driving, and come to a stop ... AND you see some little wisp of blue gray smoke come up ... have then take a look for an oil leak. with these aluminum block engines that are machined so carefully ... any oil leak on the block will make them warp from uneven heat expansion. it trashes the engine over time ... to save a few pennies. of course do not EVER buy a used BMW with an oil stained engine. Same for helicopters and airplanes. Remember ... politicians like diapers must be changed often sumbuddie said dis L:? > in article gs27s6$jh...@panix2.panix.com, Scott Dorsey at klu...@panix.com > wrote on 4/14/09 7:50 AM: [quoted text clipped - 20 lines] > > L:? Well, that's terrible news. I had it in the shop, and they replaced the gasket, and it still leaks. So now I just now took it back, but this is scaring me. >Well, that's terrible news. I had it in the shop, and they replaced >the gasket, and it still leaks. So now I just now took it back, but >this is scaring me. What gasket did they replace and where does it leak? Are you going to tell us the whole story or it is just going to keep coming out in little drips and drops? --scott Signature"C'est un Nagra. C'est suisse, et tres, tres precis." > >Well, that's terrible news. I had it in the shop, and they replaced > >the gasket, and it still leaks. So now I just now took it back, but [quoted text clipped - 6 lines] > -- > "C'est un Nagra. C'est suisse, et tres, tres precis." Ok. Well, first of all, you'll note that I did indeed mention the oil leak in my original post. Moving on, I had the valve cover gasket replaced. The shop also replaced the grommets and also had to replace the plugs and the seals (or whatever they are) around the plugs, since the plugs were soaked in oil. I was very impressed with the guy at the shop and had a good feeling about the whole thing. So I drove the 5 minutes back to work, and saw it was still leaking. Left the car back at the shop this morning, and then saw the post about possible engine damage and my insides started churning. I called the shop and they said the leak was from an oversight, that a seal hadn't been fixed correctly. But I haven't yet picked up the car again. >Moving on, I had the valve cover gasket replaced. The shop also >replaced the grommets and also had to replace the plugs and the seals >(or whatever they are) around the plugs, since the plugs were soaked >in oil. Makes sense. If you have hydraulic lifters and don't have to pop the valve covers every once in a while and put a new gasket on in the process, eventually the gaskets and seals will go bad just from age. >I was very impressed with the guy at the shop and had a good feeling >about the whole thing. [quoted text clipped - 6 lines] > >But I haven't yet picked up the car again. Makes sense... it's very easy to not seat one of those rings properly. You should be fine. --scott Signature"C'est un Nagra. C'est suisse, et tres, tres precis." |
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