Smell only when defrost is on

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Smell only when defrost is on - 11/27/2007 4:26:27 AM    m00nwater Posts: 3269 Joined: 3/10/2005 From: Redbridge, but I now live in the 'shwa Status: offline OK, OK, so I don't own my Blazer anymore, but I trust the opinions of my guys in here still, so that's why I am asking this here. So as many of you know, I have a 1997 Dodge Grand Caravan now. I have an issue that is puzzling me that hopefully you guys can help me out on. When I turn the defrost on, a very strange smell occurs. I would describe it as, not a burning smell, but also, not a wet smell. It sort of smells like something was wet, but at the same time, it smells like something burning. I know, it's an odd smell to describe so that's the best I can do on a description. This only occurs when the defrost is on, and NEVER when the regular heat is turned on. If I turn it to combo the defrost and heat on the floor, the smell occurs, and when it is defrost on it's own. Any ideas? I'm stumped. < Message edited by m00nwater -- 11/27/2007 4:28:56 AM > _____________________________ :::::::::::::::::::::::::: little girl in a big truck::::::::::::::::::::::::::: Post #: 1

RE: Smell only when defrost is on - 11/27/2007 8:59:11 PM    jamesbalzer   Posts: 8 Joined: 11/24/2007 Status: offline Needs new A/C Filter Drier/Accumulator.  Whatever they're called nowdays.  The defroster setting uses the AC system to dry the air.  Sounds Moldy. (in reply to m00nwater) Post #: 2

RE: Smell only when defrost is on - 11/27/2007 11:38:00 PM    Chevy Lover General Tech Moderator Posts: 3411 Joined: 6/11/2006 From: Vancouver. B.C. Canada Status: offline It does sound like it's in the evaporator core area, because it's recycled air in defrost mode. You'll probably smell it if you use the A/C as well. (Although I'm sure that you won't need the A/C for a few months yet) There are some products that you can buy that you spray into the intake duct (near the right side of the firewall), while the heater fan is running. There are deodorizers and products to kill the mould also. I haven't used them for years, you could check with your local parts store or and auto A/C shop. That might work. If it doesn't, then you'll have to access and possibly have to remove the evaporator core to clean or replace it. The accumulator is a closed system that contains refrigerant, refrigerant oil and a dessicant (to remove internal moisture), and will not cause any smell in the vehicle. _____________________________ Give a man a fish and he will eat for a day, teach a man to fish, and he will sit on a boat drinking beer for a life time (in reply to jamesbalzer) Post #: 3

RE: Smell only when defrost is on - 11/28/2007 4:44:05 AM    m00nwater Posts: 3269 Joined: 3/10/2005 From: Redbridge, but I now live in the 'shwa Status: offline Thanks guys! _____________________________ :::::::::::::::::::::::::: little girl in a big truck::::::::::::::::::::::::::: (in reply to Chevy Lover) Post #: 4

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