2001 ML55 Overheating
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Newbie
Joined: Jan 2012
Posts: 6
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ML55
2001 ML55 Overheating
I have a 2001 ML55. It started overheating when I was stuck in line to get into Disneyland.
When I turn my A/C on the fan does come on and my temp goes down to operating temperature.
What could be causing my ML55 to over heat?
Why doesn't the fan come on when the temperature rises to high?
Thank you.
When I turn my A/C on the fan does come on and my temp goes down to operating temperature.
What could be causing my ML55 to over heat?
Why doesn't the fan come on when the temperature rises to high?
Thank you.
Member
Joined: Nov 2005
Posts: 144
Likes: 6
From: Palm Beach County, Fl.
W163 ML500 w/Kleeman headers (gone but not forgotten); R63
I have a 2001 ML55. It started overheating when I was stuck in line to get into Disneyland.
When I turn my A/C on the fan does come on and my temp goes down to operating temperature.
What could be causing my ML55 to over heat?
Why doesn't the fan come on when the temperature rises to high?
Thank you.
When I turn my A/C on the fan does come on and my temp goes down to operating temperature.
What could be causing my ML55 to over heat?
Why doesn't the fan come on when the temperature rises to high?
Thank you.
Either search, or perhaps someone here knows which switch/relay is most the likely culprit. Most often the replacement is DIY.
Regards,
Jerry
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
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From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
The first thing you have to do is check the 100 amp fuse near the battery. With a test light or DVOM check for B+ voltage at both sides of the fuse.
If the fuse is OK, then you must conduct tests at the ECU for the Coolant Temp. Sensor. Do you have a DVOM?
If the fuse is OK, then you must conduct tests at the ECU for the Coolant Temp. Sensor. Do you have a DVOM?
Newbie
Joined: Oct 2013
Posts: 6
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2001 ML55 AMG
I am a new owner and having the same issue ... I looked for the 100amp fuse near the battery and could not find it ... Also was trying to locate the relay/switch and I am unsure if it's the one attached to the fan or elsewhere. Hope I can get some help with this thanks.
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Did you look at the photo above?
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2001 ML55 AMG
Thread Starter
Newbie
Joined: Jan 2012
Posts: 6
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ML55
Temp switch
I was able to finally find the temp switch for the fan. If your looking at the engine, on the front left side of the engine is where the switch is located. I believe there is a small clip that holds it in place. I also remembered that the o-ring did not originally come out when I pulled the switch out. Make sure you get the old o-ring out before you put the new switch in, and that the new switch has a new o-ring.
I will try to get pics, but may not be able to until this weekend.
I will try to get pics, but may not be able to until this weekend.
