Question about 1985 Mercedes-Benz 300

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Auxilary fan 1985 300D

Auxilary fan doesn't work....causes car to run hotter than normal & overheat when using A/C...any ideas on how I can repair this?

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Hi,maybe the motor,if not check the following;

  • ax.fan connection
  • fuse
  • 2 relay in wheel house for function

Posted on Feb 22, 2009

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UNPLUG MOTOR & RUN 12 VOLTS DIRECT FROM BATTERY TO SEE IF FAN MOTOR IS GOOD NORMALLY MOTOR IS BURNT UP IN MY EXPERIENCE

Posted on Feb 19, 2009

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Engine overheating


Overheating can be extremely bad for a car. Back in the days of carburetors, when engines were made of steel, overheating was much more common, and less damaging. But the modern engine has far less tolerance, with its aluminum blocks and, often, aluminum heads.

Many head gaskets have been blown out by overheat issues. Many heads have been cracked. These are not cheap repairs. Therefore, be vigilant and watch that heat gauge (thermometer). If your car starts to overheat, pull to the side of the road, and let it idle (do not give it a fast idle - that only worked in the days before electric fans) and, if that does not seem to be working, shut it off.

Bohdan Bodnar wrote: "The 2.2/2.5 liter cooling systems *MUST* be purged of air before operation; otherwise, coolant flow blockage will result (i.e., hot, possibly REALLY hot, engine). Partial purging will cause the engine to run hotter than normal; the temperature will gradually drop to normal as the system purges itself over several days/weeks."

Oct 21, 2012 | 2003 Mitsubishi Outlander

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Dual radiator fans not working


Whats happening? Does it over heat? Does the heat work? If not over heating, does the engine run hotter than it did before you noticed the problem?

Mar 12, 2012 | 1998 Lexus Gs 300

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Car only overheats when a/c is turned on.? is there a coolant temp sensor or not?


Yes there is a sensor. It tells the PCM the engines temp and from there a number of things are going on.

Have the car running and turn the a/c on and look under the hood at the cooling fan(s). If the fan is not on immediatly wait for a minute as they may come on when the a/c pressure rises and not right when the a/c is turned on.

The a/c condensor gets very hot. That would make the air being drawn in hotter than normal. The engine temp may rise higher than normal as well. Is it really over heatting or just running a bit hotter.

Aug 31, 2011 | 2001 Lincoln LS

1 Answer

Auxilary fan not coming on, what does it do & what would cause this?


This fan comes on when the A/C is turned on or if the car is running excessively hot. If the A/C doesn't work anyway and the car is not overheating then there is little concern.

Aug 30, 2011 | 1992 Honda Accord

1 Answer

97 Honda Prelude, when using the A/C the car overheats when in stop and go traffic or stopped. If I go 50 mph or more the car is fine with the A/C on. What part do you think needs to be replaced


is the cooling fan working with and without the a/c on.this could be the problem and is it spinning fast enough.if its starting to seize up it won`t be turning at a fast speed like it should.with the a/c on it puts a load on the motor that causes it to work harder thus run hotter.another thing to check is the rad flow as if its not flowing enough coolant it can cause this as well.have you changed the thermostat as if its not working properly it could be not opening as it should again causing the motor to run hotter.

Jul 17, 2011 | 1997 Honda Prelude

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Kia spectra 2000, what causes over heating?


Hi and welcome to FixYa!

Few things why the car overheats, here are the following:

- Weak radiator blower motor
- Clogged radiator
- Cracked head or head gasket
- Faulty water pump (coolant will not circulate if it's faulty)
- Worn out radiator hoses
- Coolant reservoir overfill (coolant overflows)

You will need to have them replaced to resolve the problem. Hope this helps and thank you for using FixYa! Have a good one!

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Just replaced ect sensor in 04 pontiac montana with 3.4 motor after the engine would run hotter than normal, but not overheat. temp goes down while driving but climbs slowly at idle until fans kick on to...


You should replace the thermostat anyway, as they get older they do not function properly and it may be the reason your temperature swings are so erratic. It is not a big repair to replace it, you can do it yourself if you are handy for less than $25.

Jan 03, 2011 | Chevrolet Venture Cars & Trucks

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Running hotter than normal looks like it started leaking bad under motor now


There is well-established procedure for trouble shouting the over heating.
Does the car overheat in driving mode?
Yes.
Are you losing coolant?
No. Check water pump (including belt) and thermostat.
If yes make a radiator compression test. You might have a bad cylinder head gasket.
The car doesn’t overheat in driving mode, but overheat in idle.
Does the fan runs?
No.
Check the fan assembly for a bad motor, loose fan blades, or bad connector.
Check the codes for a bad temperature sensor.
Check cooling fan relay and fuse.
If this isn’t enough to solve problem, then send the car at dealer for a “check and advice”.

Aug 24, 2010 | 2002 Chevrolet Malibu

2 Answers

The car is running hot..we went to change the thermostat, but discovered it didn't have one in the line. What could be causing it to run hot??


check electric fans to see if they are coming on. and also make sure there is enough anti freeze in system. if fans do not work proper, check the fan relay if relay is ok. then the problem is either a bad wire or the fans itself are bad. to check fans-- take wire connector off of fans, then run a wire from positive on battery to positive on fan, ground other wire if need be. if fans do not run then thats your problem.

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