Hi I have a 1985 245ti with a overheating problem that is getting worse by the minute. The expansion tank is empty every three week, and I fill it up every time it gets low. It doesn't leak the coolant and one of the cylinders is not compressing. I was thinking that it's the head gasket, but I don't want to embark on this quest for nothing. I want to make sure it's the right thing. Today I was driving up a small hill for about a mile with the heater on full blast and the car got up to 3/4 of the way on the temp guage. I was wondering if it could be a stuck thermostat or bad radiator. I don't think it's the thermostat becasue it stays closed until the engine warms up. Should I mess with having the old junky radiator cleaned out or should I get a new tripple row heavy duty radiator for $119 shipped from eeuroparts.com? I live in the desert so is it worth it to just go ahead and get the tripple row anyways? What should I do with the head gasket and the radiator? HELP!!!!!:(

Charles 1985 245ti 134K :(