What causes a car to overheat without coolant loss?
What causes a car to overheat without coolant loss? Overheating without coolant loss. Overheating caused by factors outside of the cooling system. It is also caused by the clogged radiator and water passages, slipping from a belt, inoperative thermostat, late ignition timing, incorrect valve timing, pre-ignition, too tight bearings, too low engine oil level, clogged exhaust system, etc. When do you know you have a cooling system problem? When the engine starts to get above the normal operating temperature, watch the cooling fan. If the electric cooling fan is not coming on or if the mechanical fan is not moving...