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Old 07-03-2003, 10:20 AM
mr. Goodwrench mr. Goodwrench is offline
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Join Date: May 2003
Location: Long Island, NY
Posts: 82
I have just finished replaceing the evaporator on my '93 300SD. I did the job myself and saved about $3500.00 . When I removed the cover from the Fan assembly under the hood I noticed a small plastic snap-in pin lying on top of the fresh air filter. They use 2 vacuum actuators to move the recirc door. The second pin was deteriorated and was ready to fall out also! Maybe your recirc flap is inoperable. It's easy to check out. Just remove about 6-7 large phillips screws and lift off the cover. You might want to replace the filter while you are in there $$$.
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