I'm replacing the two - one is for the central locking system behind the cluster, and the other is for the center vent.

Does anyone have a picture as to which way they should go? Mine have been messed with before, giving them a 50% chance of being right :-)

I understand what they do as a device, but I don't understand their placement in either system, could someone shed some light on it? (Especially in the ACC system)

Thanks!
dd

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car

I have answered part #1 of my question - found pictures of the check valves in dmorrisons wiki article on Evaporator replacement.

http://www.peachparts.com/Wikka/W123Evaporator

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car

He says "This is not a terribly difficult job . . " The step by step pictures were great, but I'd never try that. It looked like brain surgery to me.

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" We have nothing to fear but the main stream media itself . . . ."- Adapted from Franklin D Roosevelt for the 21st century

OBK #55

1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 90,000 miles
2002 C320 Wagon 122,000 miles
2016 AMG GTS 12,000 miles

nah, i'm doing the dash off thing now. it aint that bad. it just is time consuming because of all the 'while im in there' stuff.

going all the way down to the evaporator look more difficult, but just time consuming and not hard per se. dmorrisons instructions are spot on as always, and it makes the whole ordeal much easier.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car