C63s coolant problem!
Thread Starter
Junior Member
Joined: Dec 2020
Posts: 21
Likes: 1
C63samg w205 edition 1
C63s coolant problem!
Hi their I’ve got a c63s supposedly the car has a coolant pump fault on the diagnostic fault codes
u02a900 communication with coolant pump 1 of the charge air cooler has a malfunction
u02a987 communication with coolant pump 1 of the charge cooler has a malfunction. The message is missing
the transmission temperature rising to 115 which I’ve read up to be not normal
I’ve tried ringing Mercedes to see if they know which pump it is if it’s a faulty pump? They’re unsure which one is it
had the car up on a ramp all three pumps seem to be working making noise whilst running and water obviously going through them I’ve had the driver pump changed around 2 months ago that hasn’t seemed to solve the issue
Im aware theirs another pump on the passenger side and another heater water pump behind the drivers side one can anyone help with these fault codes?
a Mercedes mechanic decided to tell me that when plugged into xentry all the pumps seem to be working so may be a wiring fault but the cars never been altered wiring I’ve checked looks all
factory wiring with no cuts or broken wires
u02a900 communication with coolant pump 1 of the charge air cooler has a malfunction
u02a987 communication with coolant pump 1 of the charge cooler has a malfunction. The message is missing
the transmission temperature rising to 115 which I’ve read up to be not normal
I’ve tried ringing Mercedes to see if they know which pump it is if it’s a faulty pump? They’re unsure which one is it
had the car up on a ramp all three pumps seem to be working making noise whilst running and water obviously going through them I’ve had the driver pump changed around 2 months ago that hasn’t seemed to solve the issue
Im aware theirs another pump on the passenger side and another heater water pump behind the drivers side one can anyone help with these fault codes?
a Mercedes mechanic decided to tell me that when plugged into xentry all the pumps seem to be working so may be a wiring fault but the cars never been altered wiring I’ve checked looks all
factory wiring with no cuts or broken wires
