Abstract: '95 C280 32K miles. Runs at
normal 80-85 C , but swings up to 95C-98C. All new coolant and fan fuses (both levels) are good. Content: This is a new behavior since coolant change (30K mile service). It would get hot to 98C after about 15-20 minutes of driving. This was not ambient temp. dependent. Maybe speed dependant. I finally removed coolant from upper tank twice and refilled with straight water to dilute coolant mix. Also ran engine a while with cap off to burp possible air pockets. Seems to have coincidentally changed behavior. Now it runs longer time at 80-85C but as a coincidence, when I go up the (not severe) hills to my home it climbs to 95-98C. Ambient cool 55-65F.Albeit slower speed of 6MPH. Freeway it stays at 78-80C. Ionman posted a similar problem in late OCT. My passenger side fender also gets VERY hot, probably because the exhaust manifold is on that side and the hot air escapes up to that side. This may sound like normal operating temp. because it is not 'overheating' but it is a new behavior and not satisfactory to ignore. I plan a hydrocarbon 'sniffer' test for coolant later and maybe more antifreeze dilution. Coolant does not have bubbles or oil while idling with cap off, i.e. no apparent head gasket leak, so far. Questions: How long do you have to run engine with cap off to really 'BURP' it? Any opinions on possible causes or similar experiences? Very well maintained C280, never overheated or abused. Thanks. ------------------ 1979 300D 133K miles 1989 300SE 1995 C280 [This message has been edited by unkl300d (edited 11-12-2000).] |
Hi, just a thought but is it possible tht the air duct that routs air to the engine mount may have debris and not allow full air flow. Maybe that would explain the hot fender well? Have not encountered that on my 94 C280 but have been looking under the body at all the air ducts to see how they are holding up, replacing missing hardware. Hope you get a good technical answer soon! best regards, Leon H.
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Thanks Leon, I checked that out today
and it seems o.k. but you may be right about this being a source of bad ventilation. ------------------ 1979 300D 133K miles 1989 300SE 1995 C280 |
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