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  #1  
Old 08-06-2001, 09:08 PM
G-Benz's Avatar
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Location: Dallas/Fort-Worth
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Thumbs up 300E overheating problem SOLVED! Duhhhh...

It's been a tense few weeks since I lasted posted the thread about my W124 overheating. Since then I had replaced the thermostat, radiator cap, and just recently, the A/C aux fan switch.

That would pretty much cover every major component in the cooling system (water pump, temp sensor, radiator, and expansion tank were replaced within the last 6 months).

SO WHAT gives?????!!!!!!

Well, I suddenly remembered that even though temps remained nominal, even while 104 outside, the coolant would still boil over...the radiator cap would rattle while coolant spilled over...

WAIT A MINUTE...THE RADIATOR CAP RATTLES???

I had taken that cap off dozens of times to refill the tank with water and coolant, but NEVER TURNED THE CAP ALL THE WAY CLOSED!!!!

So this afternoon, I turned it fully clockwise until it seated firmly, and guess what???

NO OVERHEATING...AND NO SPILLED COOLANT!!! By the way it's 101 today, and the A/C was chugging at full tilt!

I told my wife about it excitedly, who just glared at me like I was some idiot...okay, I was some idiot!

Anyway, I dodged the blown head gasket paranoia for at least a little while...maybe I'd better save up for the inevitable, for when it DOES happen down the road...

Thanks to all who helped. I now know more about the cooling system than I ever cared to!

Maybe I can stop starting threads on the tech forum for awhile and go play in the what-cool-parts-I-can-add-to-the-car forum...
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  #2  
Old 08-06-2001, 09:23 PM
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I can feel your delight from where we are ...
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  #3  
Old 08-06-2001, 09:52 PM
David C Klasse's Avatar
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Location: Mission Hills in the City of San Diego
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Re: 300E overheating problem SOLVED! Duhhhh...

Quote:
Originally posted by G-Benz


I had taken that cap off dozens of times to refill the tank with water and coolant, but NEVER TURNED THE CAP ALL THE WAY CLOSED!!!!
at full tilt!

YOU MORON!! LOL!!!

Haha, just playing. Glad it was an easy fix!!
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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
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  #4  
Old 08-07-2001, 02:20 AM
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Posts: 750
but wait, 101 is still a bit high!! the aux. fan
should engage at 90 to bring the temp. down
to normal (80).
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  #5  
Old 08-07-2001, 02:26 AM
David C Klasse's Avatar
CheFrac is Back!
 
Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
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No, 100 they should kick on.....
?
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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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  #6  
Old 08-07-2001, 02:29 AM
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Join Date: Jun 2001
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Joel:
In Texas in the summertime, 101 is the AIR temp. (Fahren.)!
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  #7  
Old 08-07-2001, 11:16 AM
G-Benz's Avatar
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Sorry for the confusion...101 F was the outside temperature.

The engine temps hover at around 85-87C. When it's really hot outside, it climbs to 90-95C, and then the aux fans kick in, (seems like at around 97C), and the temperature goes back down to around 85-87C.

80C seems a bit cool for normal engine operation...
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