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#1
06-16-2009, 08:59 AM
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Confirm my diagnosis
'92 300SE.
Losing coolant slowly. (1/2" per day from reservior) New headgasket 9,000 miles/1 year ago. No coolant loss from May of last year to May of this year. All new hoses. No signs of drips anywhere. However, start the car and you can smell coolant. Cut the car off, even when hot (100C on the gauge after sitting briefly after exiting freeway in 100+F temps - runs at 85C when in motion, regardless of outside temp). Let the car sit for 5 minutes - no drips, and no smell. Start the car again, and you can smell coolant. I'm thinking (and have ordered) a new radiator. I believe there's probably a small leak in the core that's slow enough that the airflow scatters the water before it can drip, and that's also why you smell coolant so quickly when you start the car, but not at all once the car has sit for 5 or so minutes. Hope I'm right - the radiator is $480. 
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#2
06-16-2009, 09:20 AM
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FWIW, I just recently fixed a problem of a pronounced coolant smell in my good wife's Maxima, but no real obvious drips or even loss from the reservoir. Yet after driving, there was clearly coolant smell. I puzzled over this for a couple of weeks and stared into the engine bay again and again. Because I keep her engine bay spotlessly clean, it should have been apparent, but wasn't. I Checked to be sure there was no coolant in the oil. Everything looked OK, but still the smell. Finally, I started the motor and stared into the bay, and quickly spotted a secondary coolant line, not the main radiator hoses, that had a tiny split next to the tightening clamp. Not much more than a subtle bubbling of air was coming out, and then only under the pressure of a running motor, but certainly enough to smell. Took off about an inch of hose with an old razor blade and re-tightened the clamp. Problem solved.
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1988 California version 260E (W124) Anthracite Grey/Palomino Owned since new and still going strong and smooth MBCA member Past Mercedes-Benz: 1986 190E Baby Benz 1967 230 Inherited from mom when she downsized 1959 220S Introduced me to the joys of keepin' 'em goin' There are only 10 kinds of people in the world--those who understand binary and those who don't
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#4
06-16-2009, 10:45 AM
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Pressuize the system and take the lower panel off and look..I use cardboard cuz it shows a/f mix instantly.
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A Dalton
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