Coolant Circulation pump error
Thread Starter
MBWorld Fanatic!
Joined: Aug 2007
Posts: 1,197
Likes: 5
From: Miami, FL
06 CLS55 Renntech stage 5, 04 CL600 ( will miss ),02e55 , 11 R350
Coolant Circulation pump error
Help please , I just had this problem today:
AC stopped working and the EC button stays lit.. which to me means that either Blower , regulator , or low on refrigerant ..OK so I ran the diagnostic through the Climate control.
- Blower is working fine , speeds changing properly ( I am assuming that means the Blower is OK , am I right ?
- EC light stays on , to me most likely , the regulator .
After running the Diagnostic , I see few errors:
- In Car Temp Sensor
- Heater Core temp
- HEater Core Temp
- Evaporator Temp Sensor
- Refrigerant Pressure sensor
- Refrigerant Temp sensor
- Sun Sensor
- COOLANT CIRCULATION PUMP
Does that mean my water pump is not working? My temp on the cluster hardly goes over 85 , and I just flushed the coolant with the proper Zerex G05 .. knowing that I have AC issues to deal with , but till I get the regulator replaced ...should I worry about driving the car with what LOOKS like a non working circulation pump ? I noticed today that my AUX fan is not coming on , I am assuming thats because the AC is not engaging ...Or am I missing something , your help is greatly appreciated. Cheers.
AC stopped working and the EC button stays lit.. which to me means that either Blower , regulator , or low on refrigerant ..OK so I ran the diagnostic through the Climate control.
- Blower is working fine , speeds changing properly ( I am assuming that means the Blower is OK , am I right ?
- EC light stays on , to me most likely , the regulator .
After running the Diagnostic , I see few errors:
- In Car Temp Sensor
- Heater Core temp
- HEater Core Temp
- Evaporator Temp Sensor
- Refrigerant Pressure sensor
- Refrigerant Temp sensor
- Sun Sensor
- COOLANT CIRCULATION PUMP
Does that mean my water pump is not working? My temp on the cluster hardly goes over 85 , and I just flushed the coolant with the proper Zerex G05 .. knowing that I have AC issues to deal with , but till I get the regulator replaced ...should I worry about driving the car with what LOOKS like a non working circulation pump ? I noticed today that my AUX fan is not coming on , I am assuming thats because the AC is not engaging ...Or am I missing something , your help is greatly appreciated. Cheers.
Last edited by maxwerks; Oct 3, 2011 at 08:39 PM. Reason: title
Junior Member
Joined: Dec 2005
Posts: 43
Likes: 0
From: michigan,windsor ON
14 e63s,03 e55, 69 280s, 92 500e, 95 e320, 08 lancer
try clearing faults and find out what comes back.
evap temp sensor or low on freon is what i would suspect.
coolant circulating pump is not the water pump
evap temp sensor or low on freon is what i would suspect.
coolant circulating pump is not the water pump
MBWorld Fanatic!
Joined: Oct 2007
Posts: 1,564
Likes: 19
From: SoCal
98 Brilliant Silver E320 Wagon
First, error messages tend to cascade. That is one error triggers another, etc.
I would first check the refrigerant pressure/temperature sensor.
Most (all?) W210's have two coolant pumps. The water pump on the front of the engine and a secondary electric recirculating pump on the wheel housing sheet metal just under/below the coolant expansion tank. May be a different location on your car. This pump supplies heated water to the duo-valve and then to the heater case.
Hope that helps some.
I would first check the refrigerant pressure/temperature sensor.
Most (all?) W210's have two coolant pumps. The water pump on the front of the engine and a secondary electric recirculating pump on the wheel housing sheet metal just under/below the coolant expansion tank. May be a different location on your car. This pump supplies heated water to the duo-valve and then to the heater case.
Hope that helps some.
Thread Starter
MBWorld Fanatic!
Joined: Aug 2007
Posts: 1,197
Likes: 5
From: Miami, FL
06 CLS55 Renntech stage 5, 04 CL600 ( will miss ),02e55 , 11 R350
Thank you so very much karwerk, thats strange .. I did in fact clear all the faults/ errors... then I ran the test again, all I got was FF , ran it again , also FF ...I am not sure if I am supposed to wait for a certain amount of time ..but not even the sun sensor error is coming up .. ALSO , I am able to turn off the EC button.. all day today I wasnt able to ..isnt that strange ? Also , I thought the coolant circulation pump was in fact the water pump ..is there another pump I am not aware of? I am going to drive the car tomorrow and see if I am able to engage the AC , and run the diagnostic again I am surprised that all errors were cleared and none showed up at all . I thank you again for your courtesy.
Thread Starter
MBWorld Fanatic!
Joined: Aug 2007
Posts: 1,197
Likes: 5
From: Miami, FL
06 CLS55 Renntech stage 5, 04 CL600 ( will miss ),02e55 , 11 R350
First, error messages tend to cascade. That is one error triggers another, etc.
I would first check the refrigerant pressure/temperature sensor.
Most (all?) W210's have two coolant pumps. The water pump on the front of the engine and a secondary electric recirculating pump on the wheel housing sheet metal just under/below the coolant expansion tank. May be a different location on your car. This pump supplies heated water to the duo-valve and then to the heater case.
Hope that helps some.
I would first check the refrigerant pressure/temperature sensor.
Most (all?) W210's have two coolant pumps. The water pump on the front of the engine and a secondary electric recirculating pump on the wheel housing sheet metal just under/below the coolant expansion tank. May be a different location on your car. This pump supplies heated water to the duo-valve and then to the heater case.
Hope that helps some.
Thread Starter
MBWorld Fanatic!
Joined: Aug 2007
Posts: 1,197
Likes: 5
From: Miami, FL
06 CLS55 Renntech stage 5, 04 CL600 ( will miss ),02e55 , 11 R350
AC DIAGNOSTICS
Well as an update , Last night I cleared all the errors , ran it again, no errors at all , the EC button was off and the AC kicked in ..but somehow I felt thats not it . This morning I drove the car , AC on EC button not lit ..all is well , few miles , EC button came back on, no AC ...parked , ran the diagnostic..now the only error showing is Eb1241 which is Low refrigerant ...would the refrigerant being low cause all of that on its own ...shouldnt I be checking the regulator , and evaporator pressure sensor ? I Know that I have to track the leak and see where it is coming from , but I also want to take care of anything else while I am at it . Thanks to all .
Last edited by maxwerks; Oct 5, 2011 at 10:42 AM. Reason: title
