A thermostat is one cause of over heating engines.
The "Related Question" below lists a few other suspects to investigate that can also contribute to overheating.
check the fan clutch
Have flushed complete cooling system replaced water pump radiator thermostat clutch fan added 2gal straight anti freeze then filled to capacity with water and truck is still over heating. What else could possibly be wrong
Guess that wasn't it, huh? Sorry, no offense intended. Is the coolant full? is the thermostat working, heater core plugged? Need more info to go further, what else has been replaced? why did you replace the heater control valve? based on what?
im having the same problem with my 1994 I've replaced the heater core,thermostat,radiator,i checked the coolant, and it's not over heating or nothing and still no heat lol
2000 Pontiac grand am se keeps over heating I changed the water pump, the thermostat, radiator cap, head, and it is still over heating. make sure thermostat is going the right way , spring gose to the motor
IF YOUR CAR IS HEATING UP(OVERHEATING) AND YOU STILL DRIVING IT, A FAULTY THERMOSTAT IS THE LEAST OF YOUR PROBLEM.
Yes, If the thermostat isn't working, It cant tell the heat to come on. Thermostat is the brain of a heating & cooling system. Most likely the thermostat itself has worn out and does need to be replaced. You can get another digital one or you can change to an older style if you so desire.
had the same problem with a sibring,took to the garage,they replaced the thermostat and gasket and found a hairline crack in the thermostat housing they replaced the housing and everything was fine then
The heater cor was replaced but it is still not getting warm
fan clutch?
Is your fan coming on?
That or the thermostat.