Hi all I have a 1989 190E it is overheating bad. I have flushed the radiator twice now, replace the thermostat and still overheats, any ideas would be very very helpful, trying to bleed the system of air but does not seem to do anygood can someone explain how to do this properly? help would be very very appriciated thanks, no oil in radiator fluid or water in oil, I am running out of ideas, ohhh and the water pump was recently replaced too.

okay so searching the forums and found out the there may be air in the system but am confused as to how to get it out. I get the car up to operating temp and then hold the upper radiator hose? and then open the bleeder on top of the thermostat housing? is this right?

Several times I have changed my coolant, replaced head gasket once, replaced water pump once, and replaced radiator,and I have never had problem with air in the system. I top off the radiator, start the engine with heat on high, and add coolant to the system as the coolant drops in the reservoir tank.

The only time I had an overheat situation was when the aux. fans or the main fan wasn't turning on due to defective temp. sensors.

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

check your temperature sensors. Check your water pump, it may be defective and you may have a clogged cooling system.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

Pressure test the system...may be a popped head gasket.

190's typically aren't that difficult to 'burp'... It also helps to have the front end of the car up...

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta

This never happened on my Mercedes but when I had that problem on my old van it was a clogged up radiator. I am not sure how to test for that. A radiator shop could probably test it for you I imagine.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

x2

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)