Got a friend with a 91 blazer, 350 TBI and it runs cold. He changed the thermostat twice, (195 degrees) and still runs cold. We went wheeling and about 1 1/2 hours into it, we popped off the radiator cap and the anti-freeze wasn'e even hot enough to burn a finger. The temp guage barely moves either. Anyone have any ideas?? Ryan Never knock on DEATH's door. Ring the bell and run...he hates that!!!!