I have a 1978 300 SD W116..
Had A/C work done ... Car is ice cold..
My problem, Water is leaking into the car..
I had a new exp. valve put in..
I looked up postings on Exp. Valves.. posting read that the drain holes were cloged up.... And that the holes are located
on both sides of the transmission.... Help !!! I can't locate the drain plugs.....

Bill, I checked under the driver side dash .. ran the a/c for 20 min.. no sweating
noticed.... I think the drain plug is clogged,, I can't figure out where the plugs are located under the car......

The drains are located behind the tunnel carpeting. They are about 3/4" in diameter and a few inches long...They connect the box to the bottom of the tunnel. If the material has broken away, the box will leak inside the car.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

I had a Honda once long ago, did the same thing. Turned out the drain tube became dislodged from the condenser box, and the water ran all over the passenger side floorboard. I would suspect a similar situation, either the drain hose was knocked off, of not reattached after the A/C work.

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Mike Tangas
73 280 SEL 4.5