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#1
07-22-2002, 11:06 AM
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My 93 500SEL is overheating
I have replaced the radiator, thermostat, hoses, radiator cap, water pump, fan relays and my 93 500 SEL still overheats. For about 15 miles the temp holds at about 85 degrees C. Then it starts to climb and will vary between 100 and 110C, sometimes dropping back to 85, sometimes not. Driving or parked does not matter. Air temp does not matter. At some point the temp will raise to 120 and I hear boiling - but do not lose fluid. No foaming in oil. No water in oil. No oil in radiator. HELP!!
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#2
07-22-2002, 04:33 PM
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Are you sure the fans are engaging at the proper times? 100 degrees is normal, even 110 is considered normal, but anything above that and I'd get a little skeptical.
Good luck.
__________________
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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#3
07-22-2002, 09:43 PM
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Agree with David. . .
check your fans: let it idle in the driveway with hood down, a/c OFF, etc. When the temp gauge shows around 100C, the fans should come on.
With the A/C on, the fans should start almost immediately if the car is 'warm' (80C or higher). The pressure switch should cause the fans to turn on. Do a search for related articles on the subject.
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#5
07-22-2002, 10:44 PM
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Lots of overheating this year! Check other threads ... several other folks are having same kind of issues.
My understanding is that fans are not the issue if the car is overheating during normal driving ... i.e. there is air flow over the radiator. Usually, can only be: radiator, pressure, thermostat ... Chances of a bad radiator are limited ... and costly. Chances of a bad tstat are better and pretty easy to replace at less than $20. You hit all the normal stuff already ... have it pressure checked, maybe (grasping at straws here)? Broken neck on overflow tank? Too high ratio of coolant to water (although this would more likely be on the margin, I guess). Keep this thread going, please. Let us know what happens and how it gets fixed.
__________________
George Stephenson 1991 350 SDL (200K and she ain't bent, yet) former 2002 E320 4Matic Wagon - good car former 1985 300 CD - great car former 1981 300 TD - good car former 1972 280 SEL - not so good car a couple of those diesel Rabbits ...40-45 mpg
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#6
07-23-2002, 08:08 AM
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Possible thermostat you installed was bad? Can happen.
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#7
07-23-2002, 11:36 AM
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Just look at my post... just about identical with my 560 SEL (but I'm betting that its the radiator). I bought a new Nissens radiator a little over a year ago and it LOOKS fine but when I reverse flushed it, I got little white particles coming out of it and although it doesn't run hot as quickly as it did, it still does because I probably didn't get enough of the crap out of the clogged radiator and it is still restricted enough to warrant the higher temps...
Did you feel your radiator for cool spots after you stopped your engine? I'd feel around the radiator (in the direction the fan blows) and would find that it would be cool on one side and while running my hand along the radiator, would get hot as hell itself to where I'd damn near burn myself. Check it and see if the same happens with yours. I've got a new Behr on the way now because my old radiator worked just fine (the neck's just shot so I don't want to chance it like the PO did). Before that I also changed the thermostat,coolant tank, cap, etc but just because the radiator's "new" doesn't mean it can't fail--just like thermostats. Good luck Alan
__________________
1997 E320 1986 560SEL 1983 300SD 1972 220D 1970 250C SOLD 1971 250C SOLD
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#8
07-23-2002, 11:49 AM
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Just look at my post... just about identical with my 560 SEL (but I'm betting that its the radiator). I bought a new Nissens radiator a little over a year ago and it LOOKS fine but when I reverse flushed it, I got little white particles coming out of it and although it doesn't run hot as quickly as it did, it still does because I probably didn't get enough of the crap out of the clogged radiator and it is still restricted enough to warrant the higher temps...
Did you feel your radiator for cool spots after you stopped your engine? I'd feel around the radiator (in the direction the fan blows) and would find that it would be cool on one side and while running my hand along the radiator, would get hot as hell itself to where I'd damn near burn myself. Check it and see if the same happens with yours. I've got a new Behr on the way now because my old radiator worked just fine (the neck's just shot so I don't want to chance it like the PO did). Before that I also changed the thermostat,coolant tank, cap, etc but just because the radiator's "new" doesn't mean it can't fail--just like thermostats. Good luck Alan
__________________
1997 E320 1986 560SEL 1983 300SD 1972 220D 1970 250C SOLD 1971 250C SOLD
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