Monovalve Repair Kit Installation courtesy of Ben Harris Repair I did was a monovalve insert replacement, not the whole unit. I bought the kit from BuyMBParts.com (part# R3023-15174). Took all of 10 minutes to install: Disconnect electrical connnector and remove screws from top plate, remove/replace insert (note placement of parts on removal and replace exactly), replace top plate. Do it with motor off or coolant will spill out. Piece of cake. My heater works great now!

Pic 1	shows location on passenger firewall in engine compartment.
Pic 2	closeup showing the electrical connector to disconnect and 4 screws to remove.

Additional pictures by P. Waleke

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