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2001 C240 W203
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3 Posts
Discussion Starter #1
Hi All

I'm having a problem with my 2001 C240 W203. The fan runs on high speed all the time--from the moment i turn on the ignition till i switch the car off.
I have already replaced the coolant temperature sensor with no luck. Have also replaced the fan thinking it may be the control module but still having the same issue.
When connected to STAR i am getting the following code

P2073-004 : Electric suction fan for engine or air conditioning : Open circuit (P1999)

There are no other error codes logged in the system.

Any assistance would be highly appreciated.
 

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2014 Mercedes-Benz C300, 2006 Lexus IS250 AWD, 2006 Land Rover LR3 SE, 2000 Ranger R83
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907 Posts
Sounds like a relay may be bad so the computer thinks that the car is always running hot.
 

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Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
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19,364 Posts
Check #5 in the pre-fuse box (in the plastic box under the positive jump-start terminal). If it were blown, the fan shouldn't run at all, but check it anyhow just in case - maybe it is loose or the connection is corroded.
 

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Registered
2001 C240 W203
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3 Posts
Discussion Starter #4
Checked the fuse and cleaned with some contact cleaner but problem still persists.

Is there a possibility of the refrigerant pressure and temperature switch being faulty but not throwing a code?
 

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Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
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19,364 Posts
Possible, but more likely it's a wiring issue. There is a test procedure for the suction fan controller, but it requires special equipment (not a part of the Chinese clone SDS system). I would check the wiring and look for shorts or corrosion on the connectors.
 

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Registered
2002 Mercedes Benz C320 Wagon
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73 Posts
Check the fuse box under the hood. Sometimes when it rains or after a car wash, water gets In there which makes all kinds of things Happen. Could have gotten wet and now there is corrosion. Moisture to the fuse box can make you change so many parts you otherwise wouldn’t.
 

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W163 Crash Test Driver
2008 ML350 (Me!), 2010 GLK350 (Wife), 2003 ML-350 (Deceased)
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