I have a 1985 300D that I believe needs to have the mono valve replace. Where is is located? Any pics would be helpful.
Thank you,

There is more information in the DIY forum

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15 VW Passat TDI
00 E420
98 E300 DT
97 E420 Donor Car - NEED PARTS? PM ME!
97 S500
97 E300D
86 Holden Jackaroo Turbo D
86 300SDL
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The monovalve is located in the engine compartment against the firewall, and a little off of the battery toward the center of the car. It should have a couple of wires hooked to the top of it thru a small connector. Will also have water hoses connected on side and bottom, I believe.

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1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150

Are you sure you need to replace the whole monovalve unit? Maybe all you need to replace is the insert which may have a torn diaphragm.

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

When these fail, unless they are leaking, usually the valve body itself is OK and you'll only need to remove/replace the insert (available from Phil). This subject is well covered in the archives. It's a pretty simple job.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold