circa 1990 same engine , replaced water pump 5 years ago. gradually overheats on long drive no coolant is missing fan belt is quiet ... does not appear to be slipping turning on interior heater with fan brings temp down flow diagran seems to indicate that heater bypasses thermostat radiator is brand new ( 6 months ) PROGRESS..... I have installed a new thermostat. The old one seemed to have lost the abi= lity to warm the car up rapidly. MISC..... For those wondering about the engine being 5% shorter ....... See this video ............ http://www.youtube.com/watch?v=3DRap5NohGd7w Also note I have used an alligator cable in place of the proper temperature= switch for the radiator fan. ( Yes the fan is spinning ) I am looking for a generic temperature switch= .. 99guspuppet --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .