Z's HOT

[Mike98Z3]

I have a 1998 BMW Z3 1.9, that I bought used last July. The engine runs great, but on a trip in September it started over heating and I can’t find the problem. This is what I have done so far with no results;

1. New radiator
2. New water pump
3. New upper and lower hoses
4. New thermostat

The heater in the car will not get warm.
I don’t see any oil in the coolant.
I don’t see any coolant in the oil.
I see a little water coming out of the tell pipe, but not much. I think its condensation.

It appears the coolant is not circulating, could there be a blockage some where?

Thanks for any advice you can give me..
Mike