mbenz1
MB Enthusiast
- Joined
- Jul 27, 2010
- Messages
- 1,009
- Car
- '08 C320 CDI Sport w/ Advcd. Agility Package
Hi All,
Hope you are well.
Need some help on a strange thing recently with my dad's 2008 S320 CDI.
After turning the engine on (from cold start), a yellow coolant symbol displays with no text (picture below) and the radiator fan turns on at full whack for about 1 or 2 minutes, then goes off, then comes on for like 10 seconds then goes off then comes on again randomly again. This will continue happening even after the engine is warmed up. Engine warms up to 90 degrees C as normal and does not overheat, however the temperature goes down slightly when fan turns on then goes to 90 degrees C when fan goes off... it never over heats or runs cold.
Took the car to our local MB specialist and his STAR showed no error codes!
I have been reading that this could be caused by a couple of things:
1) Coolant expansion tank AND/OR Washer fluid tank sensor: apparently these are wired in series (can anyone confirm this for this model?) and if one goes faulty, it could trigger the engine fan and put on that yellow coolant light.
2) MB specialist said it could be the fan clutch/module going faulty - is this built-in with the fan unit? If so, then it would mean a new fan unit?
3) Rear consumer battery? Its showing 11.8V with car off and 14V with car on. I asked the specialist and he said 11.8 is not very low? I thought 11.8V is like 10/20% charge and 12.8V is a fully charged battery??? Ca a low consumer battery trigger this yellow symbol and cause the fan to turn on or is this a unlikely?
Any ideas on this strange problem? Fan never comes on when the car is off.
Hope you are well.
Need some help on a strange thing recently with my dad's 2008 S320 CDI.
After turning the engine on (from cold start), a yellow coolant symbol displays with no text (picture below) and the radiator fan turns on at full whack for about 1 or 2 minutes, then goes off, then comes on for like 10 seconds then goes off then comes on again randomly again. This will continue happening even after the engine is warmed up. Engine warms up to 90 degrees C as normal and does not overheat, however the temperature goes down slightly when fan turns on then goes to 90 degrees C when fan goes off... it never over heats or runs cold.
Took the car to our local MB specialist and his STAR showed no error codes!
I have been reading that this could be caused by a couple of things:
1) Coolant expansion tank AND/OR Washer fluid tank sensor: apparently these are wired in series (can anyone confirm this for this model?) and if one goes faulty, it could trigger the engine fan and put on that yellow coolant light.
2) MB specialist said it could be the fan clutch/module going faulty - is this built-in with the fan unit? If so, then it would mean a new fan unit?
3) Rear consumer battery? Its showing 11.8V with car off and 14V with car on. I asked the specialist and he said 11.8 is not very low? I thought 11.8V is like 10/20% charge and 12.8V is a fully charged battery??? Ca a low consumer battery trigger this yellow symbol and cause the fan to turn on or is this a unlikely?
Any ideas on this strange problem? Fan never comes on when the car is off.