124 fan comes on start up

When the car has been sitting sometimes on start up, the cooling fan comes on other times not. It seems to be working at high temperature. Any help?

[stevebfl]

Need to know model and year. The auxilary fan circuit changes almost every year.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician

[Benzmac]

After knowing the year, we can help. Many times one will see a coolant sensor cause this.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

The model year is 1991 early in the production year. Sorry for the late reply was out of town.