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A class Mercedes radiator fan on all the time

Fan runs contiguously

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S500


this is an indication that there is a problem in the cooling system. Check the radiator cap is operating correctly. Check for correct operation of cooling fans ( replace if you have a viscous fan hub on the fan). Have a flow test done on the radiator as there may be too many cores blocked for efficient cooling. Run the fault codes to check for air/fuel /timing issues that will affect the engine operating temperature.

May 14, 2014 | 1996 Mercedes-Benz Mercedes Benz S Class...

1 Answer

Where can I find the mercedes C240 radiator fan terminal


The fastest way to check a radiator fan is to turn on the a\c while idling , this should automatically turn on both fans at once, if they don't come on first check the fuses then the fan relay. If the motors are working when the a/c is on then your thermoswitch has gone bad (its located somewhere on the radiator, look for two wires coming out of it)

Nov 18, 2013 | 2002 Mercedes-Benz C-Class

1 Answer

Why does my 1997 mecedes benz e420 run hot when I turn on the air conditioner


Couple of reasons. You may need to have the Radiator backflushed to remove sediment. You also have an Electric cooling fan which may be malfunctioning. They (fans) often have more than 1 speed and high speed may be broken so it can not keep up with extreme heat.

Some fans use more than 1 relay to switch the fans and the second stage relay may be bad.

Overall, the A/C coil is placed in front of the Radiator and depends on airflow to function. This makes the air available to the Radiator much hotter so the Radiator is having a hard time cooling the engine. The Electric radiator fans kick up the airflow to help both systems out.

A dirty radiator, old antifreeze, etc. can affect performance.

I hope my solution is helpful. Radiator shops can service most Brands.

Jun 30, 2012 | 1997 Mercedes-Benz Mercedes Benz Sl Class

1 Answer

How can i troubleshoot engine over heating


If the Fan is not working, check the radiator fan belt, (in some cars like Benz s500 yr 2000, it has it's own belt for sure), it might have been broken , check the fuse also, take your time to look on the connecting wires to make sure none is cut, that must solve the problem, your radiator must fan must be working.

Jan 10, 2012 | 2000 Mercedes-Benz S-Class

1 Answer

I have a 1991 MBZ 2.6 Liter. The front has two fans that are in front of the radiator...All of a sudden the fans are running, when the motor is running; Please tell me what the fans are for ,and why they...


The fans are radiator cooling fans. They are temperature controled so when you first start your engine in the morning they should not run - UNLESS you start it with your AC on. If you turn your AC on one of them should start operating and the other one will kick on when your engine starts getting hot.

Aug 29, 2011 | 1991 Mercedes-Benz E-Class

1 Answer

I have a c200 1996 classic, auto. The front radiator's fan (NOT THE DOUBLE ac FANS) is not spinning fast enough to cool the engine. what is causing the weakness of the radiator's fan spin? I appriciate....


The front fan is a slow spinning ac fan, the rear rad fans are for cooling and also ac at times, if the car is overheating then you may need to check the coolant fan sensor,or the thermostant,

Dec 08, 2010 | 1996 Mercedes-Benz C-Class

1 Answer

I got c180k 2004 when I am in heavy traffic the temperature gose up and show 'coolant see showroom' when the traffic easy up and start to flow the temperature goes down.I try to run the engine for a long...


possibly faulty electronic fan control module which is inside the radiator fan, must get your car in to the Mercedes workshop and read fault code and also they can activate and check is the fan is working or not by there diagnostic CPU, if the activation dos not work, then replace the radiator fan , is this information helped you?

Oct 13, 2010 | 2004 Mercedes-Benz C-Class

1 Answer

Heater motor not working/radiator fan problem


Easier to buy a new motor. Especially if your gonna go threw all the trouble to take the old one out to repair it.
Fan runs all the time because either the coolant temperature sensor is defective or the relay or circuit is shorted/ defective.

Mar 30, 2010 | 1998 Mercedes-Benz C-Class

2 Answers

Coolant fan on 2000 S430 Does not work ,but fan motor is good,


they don't run all the time only when the temp sensor tells them. is the car overheating?

Aug 17, 2009 | 2000 Mercedes-Benz S-Class

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