I HAVE A 4.3 CHEVY TRUCK 1995, HOW CAN I VERIFY MY THERMOSTAT IS WORKING PROPERLY, MY TRUCKS HEATER WILL WORK ON AND OFF EX. BLOWS HOT THEN BLOWS COLD I HAVE REPLACED MY WATER PUMP AND CHECKED COOLANT LEVEL WHAT NEXT?
Optional Information:
1995 Chevrolet TRUCK1500 4.3 VORTEC
Already Tried:
WATER PUMP,COOLANT