Hello, folks. I have a '66 122 with an M41, which I'm just about ready to put back on the road after three years of restoration. Here's my problem: when I start the engine and let it idle, the needle on the temperature gauge heads over to the far right in no time at all. When I've driven the car (three jaunts around town so far, about 10 minutes on the road at most) the needle never moves to the left of "H".

The car has a new thermostat, new radiator hoses and heater hoses, and I had the radiator boiled out. The radiator is from a later model 122 with the expansion tank.

I haven't noticed the engine missing or any steam coming out, but when I park the car and pop the hood, I see that coolant is coming out of the overflow tank's cap, and I hear what sounds like -- well, like boiling water.

Having eliminated what I would think are the most obvious causes -- silted-up radiator and bad thermostat -- what should I look at next?

Thanks,
Dave LaChance