w210 fans

[alfabm]

e300 td 1997


the two fans in front of the rad are running all the time is this correct ?

two in front of the rad and one (visc) in the engine bay

 

[troiscentmille]

No doesnt sound right , In nearly four years ive never known my radiator fans come on!

 

[BlackC55]

Is your AC on?

 

[Olivier]

Mine only run once in awhile, and only when the AC is on, like Olly asked. But certainly not all the time.

 

[alfabm]

ill try it without the air con on

 

[johnsco]

The two fans in front of the rad start up when you switch the air con on.

Johnsco

 

[lynall]

Mine dont, think they only come when, 1 ac is on and ,2 when ambient air temp is high enough to require the extra cooling.



Lynall

 

[johnsco]

You're almost certainly correct, Lynall.
The E300TD never gets hot enough for the electric fans to cut in for that reason.
Although, I suspect that is how it will probably work in a hot climate.

On my old Type 126, the electric fan came on exactly as you say ...
1. When air con switched on
2. If you left the engine idling on a hot day, the temp gauge would rise and then the electric fan would start to correct this.

Cheers.
Johnsco

 

[johnsco]

To refer to the original question from ALPHABM ...
If the fans are running all the time when the AC is not on, then the temperature sensor is most likely defective.

Johnsco

 

[poisas]

Hi, my w210, also i drive for 1.5years, fans where never come up, doesnot matter if aircon is on or not, i have changed thermostat from 80deg to 85deg opening, mostly i have 82C of temp max never goes more, no matter how hot is can be 35C outside, fanse sit quet ... i beleave they need to start with AC on...