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Date registered: Oct 2002
Vehicle: 1967 250 SL, 1963 220Sb
Location: Los Angeles / Altadena
Mentioned: 3 Post(s)
Quoted: 102 Post(s)
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.
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, ...