Thermostat regulates coolant temp so that the engine doesn't run too cool, It has no effect on the heater temp once the engine has reached operating temperature. Check that the hoses running from engine cooling system to the dashboard are not blocked, bent or broken. (Actually if broken, engine would lose all coolant fluid, and you would notice the mess). Check that the heater switch is doing its job, and actually activating the heater. All that said, If your car happens to have NO thermostat, engine will never reach a normal temp, and the heater will not work.
159 views
Usually answered in minutes!
Hi, you answered my first question about the Geo with no heat. I can't see or feel anyplace where there's a restriction in the hoses, i topped up the coolant reservoir, and let the car idle till the thermometer said it was warmed up, but the hose at the top of the radiator, and the radiator cap for that matter, still felt cold. Are these perhaps symptoms if a water pump has quit? do you know where it is on this car? thanks so much.
-S
×