02 clk320 cooling fan not running... need help - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 03-30-2006, 11:15 AM Thread Starter
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02 clk320 cooling fan not running... need help

got a 2000 clk 320 and the cooling fan doesn't run, even when the engine overheated till the coolant boiled and steamed (that's actually how i realized the fan never worked since i bought the car couple months ago). the clk's onboard computer doesn't indicate any malfunction, all fuses are checked and good, nothing showed up even on a diagnostic computer in the auto shop. the shop owner told me i need to replace the thermostat but i don't think that's the source of the problem.

i've heard there's actually a fuse on a relay that controlls the fan on some mercedes models but haven't check this yet on my clk.

any other suggestions from any of you guys here??
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post #2 of 6 (permalink) Old 03-30-2006, 01:11 PM
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RE: 02 clk320 cooling fan not running... need help

Hey, ooisper, welcome to the forum.

The very first thing I would try is to disconnect the fan and jumper it's connector to 12V to see if it comes on. It may simply be a dead fan, which is probably the easiest thing to take care of.

Good luck and enjoy the ride,
Greg
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post #3 of 6 (permalink) Old 07-21-2008, 02:43 AM
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Hi,
How do you jumper the connector to 12v?

Quote:
Originally Posted by gregs210 View Post
Hey, ooisper, welcome to the forum.

The very first thing I would try is to disconnect the fan and jumper it's connector to 12V to see if it comes on. It may simply be a dead fan, which is probably the easiest thing to take care of.

Good luck and enjoy the ride,
Greg
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post #4 of 6 (permalink) Old 07-24-2008, 07:45 PM
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My thermostat seems fine. I think that I have narrowed down my problem. My two smaller fans are intermittently not coming on when the A/C is turned on or when the temp rises above 110 oC.

This is the latest:

- I drove approx. approx. 45 mins. with the A/C on and the small fan on the passenger side was on on as the A/C was running. I didn't check to see if the fan would stay on if I turned the A/C off.

- Then the Temp Gauge started to rise slowly from the 90 oC mark to over 110 oC and then just under the red danger zone. I pulled over and checked to see if the small fans were on and to my surprise, both of them were not on. The larger fan (not the small 2 ones) was turning but kind of slowly.

Does anyone know what controls the two small fans? Is there a fan relay of some sort? It seems that when the engine gets too hot the fan(s) don't want to stay on. Would a rely stop working intermittently due to heat?

I have a test car to swap parts with as I have a 2002 CLK 430, which is the same year as my CLK 55. Any ideas on what to swap out to see what the problem is before buy the actual parts?

S.O.S.
HELP.
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post #5 of 6 (permalink) Old 05-11-2009, 01:56 PM
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Hi did you ever get to the bottom of this problem? I have the same issue with my 2000 CLK320. The temperature goes up to 110, but the main auxillary fan does not cut in.

Liz
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post #6 of 6 (permalink) Old 05-28-2010, 10:31 PM
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Hi, I had a bad fan switch relay.

Did you get your problem fixed? What was it?

Quote:
Originally Posted by Barry Kerr View Post
Hi did you ever get to the bottom of this problem? I have the same issue with my 2000 CLK320. The temperature goes up to 110, but the main auxillary fan does not cut in.

Liz
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