Ok, so since everyone is talking about radiators and cooling, this would
be a good time to ask for advice about my cooling/heating problem. I had
these problems before, so I did the following to no avail:
- New thermostat, installed with the little hole pointing up.
- Changed/flushed coolant.
- New heater valve.
Now, here are my symptoms:
These symptoms lead me to believe that I have a coolant flow problem.
- Does anyone have any clever tricks to measure coolant flow in different
- Could this be caused by air bubbles in the system?
- Does anyone in the Boston area have a used Radiator that I could temporarily borrow to see if mine has a blockage? I don't care if it leaks.
'86 928S 5-spd w/LSD
My guess is a bad water pump impeller ..... guess only but that is consistent with the symptoms . The new pumps used a plastic impellor molded to a metal ring which is pressed onto the shaft . The molding to the metal run can delaminate and strange circulation issues arise. Older pumps use a metal impellor which can corrode . On rare occasions the impellor (metal) can get loose and slide toward the engine block and begin machining away the block which eventually makes the pump less efficient .