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The coolant level may be just a little low and you're getting air bubbles through the coolant that circulates into the heater core. It doesn't cause any problem and can make that noise even if there IS enough coolant. Sometimes, even when the coolant level is up, an air bubble can get caught in an engine and when it makes noise it can cause concern, but it won't damage anything.
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∙ 18y ago
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Heater starts to turn cold when at stop light - what causes that?
The #1 cause of cold air from the heater when the car is stopped, or the engine is idling, low engine coolant levels.
What causes a cars heater to blow cold air?
THE CAUSE for this is that when your cold air is on the petrol is used to create air. and that is how cars create cold air
Why would a Mercedes 190e 2.6 heater blow cold air for 10 minutes and then get finally blow hot air and make gurgling sounds?
Sounds like low coolant or air in the cooling system
What causes cold air to come out of air vents when heater not on?
The heater may not be on - but the fan still blows air through the vents when they're open !
Why would the heater on your bravada only blow cold air?
Possible causes are, low on coolant, thermostat stuck open, clogged heater core or vacuum scorce not getting to the heater control.
Why is your car overheated but radiator full of water heater blowing cold air and knocking sound?
Have you checked your thermostat?
Home Heater blows cold air and the fan wont shut off?
It sound like the thermostat is broken
What causes a night heater to blow cold air?
Low coolant, bad coolant, blockage in the coolant line, bad heater core or element, bad thermostat
Gurgling in pipes after flushing?
Probably due to an airlock in the cold water system (feed pipe).
What causes the heater to blow cold air when the engine is overheating on a 1999 Cadillac Seville?
Low coolant. If the coolant is low then the heater core is not able to transfer heat in to the car.
What causes the air conditioner in a car to not get cold and the heater to not get hot?
If it is broken. It could be a faulty temperature blend door actuator.
How do you fix the gurgling sound coming from the heater core in your 2000 Chevy silverado?
Unless the engine is overheating, you have air trapped in the system. Park the car on an incline or jack up the front as far as possible. When engine is cold, remove the radiator cap, set heater controls to hot, and start the engine. Make sure the radiator is full and watch for air escaping. Keep the coolant level full and when you see not more air bubbles escaping, you are done. Replace the radiator cap, and see if the sound goes away. If not, take it to a professional.
