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Old 07-04-2013, 12:33 AM
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Join Date: Sep 2004
Location: Seattle
Posts: 1,971
Fixed my Duovalve

I had the classic "left vent hot" symptom. That side of the duovalve was sticking open. I saw a pretty good DIY at benzworld I think. But it did not really have an explanation for the problem or solution. But following that general procedure, here is what I did:

Pulled off the electrical connector
Removed the 5 T10 torx screws
Carefully lifted off the cover which contains the electrical coils
1 at a time carefully removed a plunger and spring making sure not to lose the spring!
Cleaned a dark coating off of the plunger with my finger nail and a paper towel, being careful not to scratch anything.
Lubed the thin part of the plunger with a little silicon faucet grease and reinstalled along with the spring of course
Repeated for second plunger
Carefully reinstalled cover
Reconnected connector

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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Old 07-08-2013, 11:24 AM
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Join Date: Sep 2002
Location: Los Angeles
Posts: 963
Thanks! This happened to my son's 2000 C230K and didn't learn until later that I probably could have fixed it myself. Indie has no time for this and just put in a new one.

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