1992 300e The cooling system isn't working. I have tried taking out the thermostat, replacing the thermostat. The pump isn't leaking or making any noise. I have now removed the radiator to see if its clogged, it seems to be fine. I 've taken the serpentine belt off and the water pump feels okay. Also when the pump is spun by hand the coolant in the thermostat housing appears to move through the engine. I've also checked the fan, it spins about 1/3 of a revolution. I really don't think that the pump is shot, but I don't see what else it could be. What else should I check before I start ripping into a tough job.

Thanks in advance
Dan

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1986 300sdl
1984 300sd
1988 300se
1973 vw thing