OVERHEATS AFTER DRIVING 10MILES CHANGED THERMOSTAT RAN WITHOUT THERMOSTAT
OVERHEATING on 1991 Pontiac Sunbird
running without thermostat will cause it to overheat. if you drive it overheating you can bet you have done internal damage to the motor. hard to say what the problem is at this point. take it to a shop and have them check for a clogged radaitor and a leak down test on cylinders.
THE FLUILD WOULD FLOW BETTER WITHOUT THERMOSTAT WOUNDNT IT CHANGED WATER TEMP SENSOR RAN WITH AC FOR 20 MINUTES RAN FINE WITHOUT OVERHEATING COULD THAT HAVE BEEN THE PROBLEM