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Old 12-21-2001, 03:02 PM
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sixto sixto is offline
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 18,745
The monovalve is inboard of the battery on the firewall under the diagnostic port.

- remove 2 philips screws behind the transmission dipstick
- move the diagnostic port out of the way
- remove 4 flathead screws on top of the monovalve
-- it might help to disconnect the 1/2" OD hose above the monovalve
--- go easy because the fitting is plastic
- lift the monovalve cartridge and top plate out of the housing
- note the order of washers as you remove the cartridge
- installation is reverse from this point

The amount of coolant I lost didn't even register in the reservoir. Maybe there's a pocket of air in my block now.

The monovalve usually fails through tearing of the rubber seal on the valve or the rubber diaphragm.

[added on 03 Jan] I've added a monovalve album to for some visuals to go with these descriptions for future reference on monovalve cartridge repair and/or replacement. Corrections are always appreciated.

91 300SE
81 300SD

Last edited by sixto; 01-03-2002 at 05:58 AM.
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