Insert the radiator key into the
Even a small amount can create air pockets which prevents proper circulation of coolant. Signs and symptoms of radiator airlock include: Overheating during normal driving. Heater not functioning correctly.
In general, it can take a few minutes to a few hours to completely remove the air from the coolant system. This time depends on the vehicle, the size of the cooling system, the amount of air left in the system, and the efficiency of the engine cooling system.
Will an Airlock Eventually Clear Itself? Sometimes, small airlocks may clear themselves as water circulation continues with one or more radiators. However, larger airlocks often require manual intervention, like bleeding the radiators or using a hose to release the trapped air.
My Radiator Bleed Valve is Stuck
Try tapping it very gently with a small hammer to see if that gets it moving. You could also try to gently loosen it with a small wrench.
Air pockets in the cooling system allow heat to build up causing extreme hot spots which can damage your engine. Air can get into your radiator, especially if the coolant level is too low or if you've recently drained it. Bleeding your radiator is necessary to remove the air.
Remove the radiator fill cap and pour the heavy-duty radiator flush into the radiator. Fill the remaining empty part of the radiator with fresh water. Place the cap back on the radiator. Start your vehicle and keep it running for almost 15 minutes, allowing the radiator flush to move through the entire cooling system.
Insert your radiator key into the valve and gently turn the release valve. Carefully twist it anti-clockwise the radiator will hiss as the air is slowly released. Water can also spray out of the radiator so be prepared. If the release valve accidentally comes out, use an adjustable spanner to replace.
Bleeding a radiator is required if it is not working as efficiently or as effectively as you want it to. You can tell if this is the case by feeling the surface of your radiator. In many cases, you'll find a cold spot around the top of the radiator surface, and could find that your radiator doesn't get hot at all.
If you have access to compressed air, use it to blow air through the radiator fins from the engine side. Start from the top and work your way down to force debris out of the fins. Be sure to wear safety goggles and gloves to protect yourself from flying debris.
Noise and Gurgling Sounds: When air is trapped in the radiator, it can create gurgling or bubbling noises as the hot water tries to circulate around the air bubbles.
In most airlock occurrences, pockets of air become trapped within the system and could put unnecessary strain on your boiler. Bleeding your radiators is a cost-free and quick remedy to this problem which we'd recommend doing twice a year.
Burping (so named because of the noise made by the bubbles of coolant exiting the radiator filler neck) is done with the radiator cap removed on cars without a valve. You wait for the car to warm up so the thermostat opens, and then the pressure of the expanding coolant being heated drives the air out.
Will a cooling system bleed itself? Your coolant system can bleed some between the overflow tank and thermostat. However, to properly bleed, you need to fill the coolant and run the car with the radiator cap off.