What to do when your car heater is blowing cold air?
What to do when your car heater is blowing cold air? Start the engine with cap still open and let the engine idle for a few minutes. If the coolant level should drop as the thermostat opens, top it up as necessary. This should bleed off the air bubble. When the engine is fully warmed up, put the cap back on and take a drive to see if the heat output has returned. What causes a heater to blow cold air? The following are some issues that may be causing the heater to blow cold air: Low coolant levels. A...