Having trouble keeping the 84 Westy cool. I had a leak in the double-T pipe right by the expansion tank. I got the metal aftermarket replacement and things were ok, but now the van overheats consistently. The temp needle pegs and the low fluid indicator blinks.
I filled and burped the system, checked for leaks and for exhaust gasses - it's fine. Few days later it overheats again and I replace the thermostat. A week after that it overheats again and I pulled the radiator out, flushed it both ways with my hose, and also flushed the system from the tank to the (disconnected) front radiator hose - all clear. Put everything back together filled and bled it and was happy for a few days.
Now it's overheating again. I'm thinking about replacing the water pump next. It's not leaking, but why else would the thing be overheating? I'm running out of ideas Someone told me that I could have a water pump with a plastic impeller that can wear out without leaking... what do you think?