Did the rear heater by-pass today(PITA), verified all the plumbing was correct from the various threads here on MUD. Started her up and temp gauge reached just below red zone. I did not notice any coolant leaking, I had coolant in the resivior, what is the next logical place to check as I chase this overheating problem. I did the heater by-pass because lines were rusted and I was leaking from several places along the rusted lines. 1995 w/135K. Thanks