Question about 1995 Mercedes-Benz C-Class

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I have a 95 c280 fans do not turn off

When I start the car the aux fans automatically on even when the engine is cold.

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

lastech
  • 408 Answers

SOURCE: RESTARTING MY 1995 MERCEDES C280

hi,seem fuel pump relay is mulfunction,better to your fuel pressure,or maybe the excess voltage protection relay is mulfunction,fuel filter should check also,ty

Posted on Mar 27, 2009

MNfisherman
  • 11896 Answers

SOURCE: 1994 c280 2 a/c fans stay on when a/c is off

The fans don't run until car hits certain temps when warm. They are timed. Shouldn't be running constantly, only when car idles for very long time should they come on.

If it barely ever comes on when idleing, the relays or temp sensor could be shot.

Posted on Jul 05, 2009

  • 784 Answers

SOURCE: 1994 c280

The 2 AC fsnd turns on when the Engine temperarure hot. It receives the signal from ECU throught the Engin temperature sensor ( Coolant). Your case happens since the Engine Temp sensor went bad. At beginning the temp sensor can not produce any resistance just like open then ECU thinking engine hot turns on the Fan. When your engine ia about 85, it is a normal temp then the sensor could produce some resistance matching the look up tabel for the ECU, then the ECU turn off the Fan. Some pepople has it run all the way since the wire contact to the sensor was off. Replace the Engin Temp sensor to take care of the problem.
You have 2 temp sensors on top engine, one for your temp read out, one for the fan purpose. If you don't know which one, wait for your temp at 85 and the fan is stopping, then unplug one, imediately the fan goes on, that the one. Good luck.

Posted on Jul 06, 2009

  • 6 Answers

SOURCE: have a 95 merzades 6cyl c280 backing firing turn

try cleaning the Air Flow Meter (AFM) also inside throttle body where the buttlefly valve is
also the Oxygen Sensor and spark plugs

of course do common maintenance such as change oil/oil filter and air filter if it hasn't been done for a long time

Posted on Sep 25, 2009

  • 462 Answers

SOURCE: hi i've a 95 c280 benz.the car dont start.

you said fuel rail has pressure , why do you want keep checking fuel system?
check ignition , and if no spark present check reference sensor(crank position sensor) , if it's bad you won't get spark or fuel.

Posted on Apr 29, 2010

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Engine diagram2.3 4cylinder


here, look through the google link and see if you can find what your chasing. Good luck.

https://www.google.com/search?hl=en&site=imghp&tbm=isch&source=hp&biw=1260&bih=674&q=mercedes+benz+c280+automatic+1997+oil+cooler&oq=mercedes+benz+c280+automatic+1997+oil+cooler&gs_l=img.3...3942.9113.0.9374.12.1.0.11.0.0.94.94.1.1.0....0...1ac.1.29.img..12.0.0.Z5xVVvJKJ-0#hl=en&q=1994+Pontiac+Grand+Am+Engine+diagram+2.3&tbm=isch

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I've turned ignition off yet can hear fan running at front of engine for a minute or two after


Hello Stephen,

So long as it is just a minute, or two that is fine, no problem whatsoever. I have had problems with some Fords which utilise the Bosch smart fan via CAN bus systems, but this normally causes the fan to start at 3 4ths speed indelicately on switching the ignition on, even when stone cold. The fan isn't running from cold in the morning is it.. As in, before you even start the engine..

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Why does engine fan stay on when engine's cold? 95 jimmy


alot of GM motors have the fan set on a clutch and run all the time..i Know I had a 305 = 5.0 v8 350 = 5.7l 4300 4.3L these are all the same and the fans run all the time.

Feb 22, 2013 | 1995 GMC Jimmy

1 Answer

Hi i've a 95 c280 benz.the car dont start.


you said fuel rail has pressure , why do you want keep checking fuel system?
check ignition , and if no spark present check reference sensor(crank position sensor) , if it's bad you won't get spark or fuel.

Apr 29, 2010 | 1995 Mercedes-Benz C-Class

1 Answer

The radiator cooling fan is always on ?


Is your AC on (AC compressor activated)? Try switching that off and see if it still runs.

Feb 24, 2010 | 1995 Toyota Camry

1 Answer

A/C blows hot air intermittently


this is clear that your aux fan cooling your condensor is not working ,your a/c system is overheating and with speed you are forcing air through your condensor doing the job of the fan.

Jul 21, 2009 | 2003 Chevrolet Silverado 1500

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