You may have one or more problems. You could have a blown fuse, you could have an auxillary water pump that has failed or a faulty mono valve assy. (You can't get just the insert for this model.)

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM