ahh, ic.

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2004 F150 4.6L -My Daily
2007 Volvo XC70 -Wife's Daily
1998 Ford F150 -Rear ended
1989 J-spec 420SEL -passed onto its new keeper
1982 BMW 733i -fixed and traded for the 420SEL
2003 Volvo V70 5 Speed -scrapped
1997 E290 Turbo Diesel Wagon -traded for above
1992 BMW 525i -traded in
1990 Silver 300TE -hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold

Wow. The one for sale on pelican for the w201 looks identical.

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Please excuse my ignorance then. And my misinformation. It does appear that part is original equipment for W123 with ACCII.

However, it must be '79 and up.

My '78 and two other '78s I have seen in my time did not have that. See picture. Looks like that epc is showing that valve or part 278. Mine definitely has 278 and for Sure no kind of vacuum control for such a valve.

Also, I can say with absolute certainty that, when I got my car and the servo was inop it was definitely defaulted to defrost only mode. Defrost on full blast hot or off only.

Must be another case of one of those design evolution kind of things. Interesting to me to try to decipher what and why the change in design from one year to the next.

What do y'all think?

Attached Thumbnails

 

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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped

former members
1984 300D "Blues Mobile"

1978 300CD "El Toro"

As has been pointed out, the large diameter version is the same as the 201 heater valve. And here's a surprise for you...it's the same as a Porsche 928/944 heater valve. Apparently, a third party component that's found it's way into various German cars.

Pelican Parts - Product Information: 928-574-573-03-M53

Thanks for the responses everyone....sorry that I didn't follow up until now (busy weekend). Mystery solved: the part that I received was in fact the correct part for a '79 300D. However, what is actually in my '79 300D is a modification that a mechanic made under the prior owner when they installed a new engine. The heating system is a hybrid from about a '76 450SL....supposedly the modification is desirable for reliability reasons (said my mechanic).

Anyway, the correct part is on order.....

I did discover that I can by-pass the vacuum valve temporarily while I wait for the part. The only consequence appears to be heat always-on. Not a big deal.

Thanks -harv