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  #1  
Old 10-11-2003, 11:01 PM
mike690003's Avatar
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Join Date: Apr 2003
Location: Miami,FL
Posts: 807
Coolant Temp sensor broken on 300E???

Hello Board'

My aux fan kicks in when I turn on my A/C, but if I have the A/C off and have my car idle for a few minutes, the temp will hit 120 C !!! I noticed that the aux fan does not engage. When I unplug the 2 prongs on the coolant temp sensor and touch them together, the fan will go on at full blast. Could the coolant temp sensor be at fault???
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1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
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  #2  
Old 10-11-2003, 11:21 PM
JetForeman
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sounds like you found the problem and answered your own question. SENSOR!!
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  #3  
Old 10-11-2003, 11:28 PM
JetForeman
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Mike, I know this question has been covered somewhere on this board but I noticed on your signature that you have debadged your 300E. Did you use the dental floss and 3M adhesive remover for this operation? Reason I'm asking is because I've been wanting to do it to both of my cars but can't remember what type of adhesive remover was mentioned, 3M is the only thing that comes to mind.
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  #4  
Old 10-11-2003, 11:35 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,745
The ACC sensor is separate from the temp gauge sensor. The temp gauge sensor is on the head between the #4 and #5 cylinders. It's a single post sensor. Pull off the wire and the gauge pointer will go limp. [On a W126] the ACC (105C/115C) sensor has a 2-pin connector and a single pin connector. The 2-pin connector has a constant ground wire and a wire to the Klima relay. The single wire goes to the electric aux fan circuit. When you hit 105C, the electric aux fans kick in full tilt. When you hit 115C, the compressor cuts off.

A bad 105C/115C switch is not uncommon but I think you have deeper problems if your car overheats in a few minutes while idling with the AC off. I can idle my 300SE a long long time with the AC off and the electric fans won't kick in.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD
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  #5  
Old 10-11-2003, 11:48 PM
mike690003's Avatar
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Join Date: Apr 2003
Location: Miami,FL
Posts: 807
JetForeman, Well my car is de-badged because it has a new paintjob and the body shop took off the emblems. I have debadged cars using dental floss and WD-40 and wiping the residue off. It removes even the toughest emblem adhesives.


sixto- well, when I say a few minutes, it actually is about 15 minutes. The temp will hit about 115, but will not get above that. I guess my coolant temp sensor is at fault.
__________________
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
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  #6  
Old 10-12-2003, 09:58 AM
J.HIDALGO's Avatar
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Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785
Check you thermostat and the coolant cap!

They are cheap and cause a lot of temperature related problems!
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J.H.
'86 300E
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  #7  
Old 10-30-2003, 01:29 AM
mike690003's Avatar
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Join Date: Apr 2003
Location: Miami,FL
Posts: 807
Found the culprit!

Hello Board,

The problem turned out to be the temp sensor that controls the aux fan. It was a $15 part that could have cost me another engine.

Thanks for all the help guys!
__________________
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
Reply With Quote
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