bleeding air from cooling system - 1963 220s - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 06-17-2016, 08:29 PM Thread Starter
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Vehicle: 1967 250 SL, 1963 220Sb
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bleeding air from cooling system - 1963 220s

New radiator, new thermostat, new water pump. I filled everything with water and everything worked correctly - the thermostat opened at the right time and kept the engine at the right temperature.

So today I drained the water from the petcock on the radiator bottom and on the side of the block and filled it back up with 60/40 Zerex G-05/water. Started the car and it went to normal operating temperature, I turned around for a couple of minutes and the needle was on the other side of the gauge.

Turned car off (duh) and felt upper and lower radiator hoses. Upper is really hot and lower is really cold. So the thermostat isn't opening. Why? I'm guessing that there is an air pocket in the lower thermostat housing. There is no bleed screw.

Ideas? Help?


Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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post #2 of 2 (permalink) Old 06-22-2016, 04:24 AM
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I know on the v8 107 model cars the guys say to "burp" the system by lowering the rear as low as you can and raising the front as high as you can, and then letting the car run up to operating temperature for a bit. Also, continue to top off the system with coolant.

Honestly, I'm not sure how this works other than hopefully getting the air out of the engine block. I would think an air pocket in the water pump would be the worst possible thing.


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