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Old 10-23-2004, 12:33 PM
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Join Date: Oct 2004
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Unhappy 1982 300D Turbo Diesel A/C Smell

My 1982 300D A/C is not draining properly. It sometimes does and doesn't , depending on the position of the vacume servos. At least I think that is what is going on. It may also be a blocked drain. It is aggravated when I hit a large bump and jostle around a bit. When the blower is first powered up, very moist air comes out. I have removed the under-dash covers, the glove box and center console to try and locate the source. Luckily, no dead animal. Maybe it is just 22 years of molds, spores and mildews that have formed an unappealing stew.
I did get a long tube and pour some clorox down each dash-vent. Helped for a while, but ruined my radio. Yep, that was stupid. I have been spraying Lysol in the air-intake area by the front passengers feet. It helps a bit, but I still have the excessive water problem.
No mercedes mechanics worth a durn for 100 plus miles in either direction.
Any help would be greatly appreciated. Thanks!

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Old 10-23-2004, 01:54 PM
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Location: Santa Monica, CA
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Vacuum servos should have nothing to do with it. Sounds like plugged evaporator box drains. Locate rubber "nipples" under car on either side of trans tunnel and clear with a wire or such.

Some info. 126 evaporator cleaned (and minty fresh ;))
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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Old 10-23-2004, 03:09 PM
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Smile 1982 300D Turbo Diesel A/C smell

Thanks for your info. I once owned a 1980SD and remember seeing those rubber nipples clearly. They were easily located and able to clear. However, on the 82 300D, they are extremely difficult to locate. I looked up there around the transmission bell-housing area, saw some water drizzling out, but no nipples. I appreciate your help!
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Old 10-23-2004, 03:10 PM
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Location: Evansville, Indiana
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Actually, they do -- it's more noticable when it's blowing in your face!

Also, in AC mode you are making cold water in there and there is no heat, so you get less moisture and stick.

Febreeze will help get rid of the odor -- spray into the intake grille outside the car while the blower is on low AFTER you get the drains cleaned out.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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Old 10-23-2004, 03:23 PM
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82 300D A/C smell

Thanks for the help. If I could only find out where and how to clear the drains that would be great! Easily done on the 1980SD I once owned, but this one is tough.
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Old 10-23-2004, 04:10 PM
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The drain on a 123 is directly on the centerline of the car. Take off the passenger side knee panel and reach way up forward on the centerline. The drain nipple has a short piece of foam tube attached to it which drains out on top of the transmission. The foam is probably deteriorated. If it isn't, it will be when you touch it. Some people have replaced the foam tube with a funnel fabricated from a plastic bottle.

2004 C240 Wagon 203.261 Baby Benz
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Old 10-23-2004, 11:27 PM
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82 300D A/C smell

I found the area you are talking about. The foam tube was deteriorated. I replaced it with a piece of rubber tubing. I ran a wire up the drain area before replacing the hose, it came out clean but I believe it is still messed up in there. I don't guess there is anyway to get a dry-vac up in there somehow and remove the water and debris, is there? I think the problem is gunk up in the plastic casing where the drain is located. I would probably have to take the dash and everything else out to get to it. That is beyond my expertise and patience level! It does drain out the bottom of the car, but it is very intermittant.
Thank you for your help on this old car!

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