Question about 1995 Mercedes-Benz C-Class
When I start the car the aux fans automatically on even when the engine is cold.
Posted by Anonymous on
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Posted on Jan 02, 2017
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
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
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
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
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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