Well Troy was right, the themostat was stuck in the closed position. I boiled it out of interest.

I put in a new thermostat and everything is working -
the engine runs at about 80C. I'm going to replace all the radiator hoses as a preventative measure.

I think that having the car sit for a while when I replaced the evaporator caused some of these gremlins.

Thanks

englishman

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1995 Mercedes E320