CL600 radiator fan control module/relay separate or on fan?
08-20-2015, 07:45 PM
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CL600 radiator fan control module/relay separate or on fan?
Hi there
2003 CL600 (5.5L v12 facelift not the 5.8L) with 50,000 miles
"COOLANT visit workshop" warning.
* Radiator fan stopped working reliably (intermittent)
-> Pulled out temperature sensor cable connected to thermostat & shorted it
-> fan started for a little while full speed.
-> Plugged cable back in to thermostat but fan stopped and wouldn't start again.
-> Ran air conditioner on hot, fan still wouldn't start.
* Also noticed coolant leak at upper hose connection to radiator (fancy metal clip)
Do we replace only the fan or is there a separate control module/relay to replace too? (I've heard it's built in)
Do we replace the upper hose or is it the O Ring / washer likely?
Do we replace the thermostat as well?
2003 CL600 (5.5L v12 facelift not the 5.8L) with 50,000 miles
"COOLANT visit workshop" warning.
* Radiator fan stopped working reliably (intermittent)
-> Pulled out temperature sensor cable connected to thermostat & shorted it
-> fan started for a little while full speed.
-> Plugged cable back in to thermostat but fan stopped and wouldn't start again.
-> Ran air conditioner on hot, fan still wouldn't start.
* Also noticed coolant leak at upper hose connection to radiator (fancy metal clip)
Do we replace only the fan or is there a separate control module/relay to replace too? (I've heard it's built in)
Do we replace the upper hose or is it the O Ring / washer likely?
Do we replace the thermostat as well?
Last edited by fatjoe; 08-20-2015 at 08:14 PM.
08-23-2015, 09:05 AM
#2
MBWorld Fanatic!
The fan comes with the controller on the shroud, I didn't see them listed separately when I looked for them.
The hose is probably an o-ring, you can remove it and see if the o-ring is flattened out and replace it. But if the hose is a couple years old it's not in the best condition either probably better off to just replace the entire hose with the ends.
Thermostat, I would leave alone if it's not giving you issues. It's unrelated at this point, since you know the fan is causing the overheating.
The hose is probably an o-ring, you can remove it and see if the o-ring is flattened out and replace it. But if the hose is a couple years old it's not in the best condition either probably better off to just replace the entire hose with the ends.
Thermostat, I would leave alone if it's not giving you issues. It's unrelated at this point, since you know the fan is causing the overheating.
