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How To Bleed Air From Cooling System Without Radiator Cap

If your car is overheating, you know that it’s important to get it fixed as soon as possible. But what if you can’t get to a mechanic? What if you don’t have the money to fix it right away? In this blog post, we will show you how to bleed air from your cooling system without using a radiator cap. This procedure is often used by mechanics when they need to remove extra heat from a car without damaging the engine. By following our instructions, you can fix your car even if you don’t have the money or the time to go to a mechanic.

Materials Required

Materials Required:
– radiators (two if necessary)
– a small bucket or container
– water
– towel or rag
– funnel
– hose clamp
– wire brush
– large pot or pan with cover
Step One: Remove the radiator cap. On most cars, the radiator cap is held on by two Phillips screws. Once these are removed, carefully lift off the cap. If you have two radiators, be sure to separate them before proceeding.
Step Two: Fill a bucket with water and place it between the radiators. Place the radiator caps back on and screw them in place using the Phillips screws. Be very careful not to touch the metal surfaces of the radiators with your hands; any oils or sweat on your skin will rust these surfaces and cause problems down the road.
Step Three: Pour enough water into the pan so that it comes up to half way up one of the radiators. Turn on the heat until it reaches a simmer, then add enough cold water to fill the pan halfway up again. Allow this mixture to cool for 10 minutes before using it to bleed air from your cooling system.
Step Four: Sit in front of one of your radiators and hold a rag over its spout. Put one end of a hose clamp over the spout of the radiator and tighten the hose clamp until you see bubbles coming out of it (don’t overtighten). Turn off all but one light

Tools Required

To bleed air from a cooling system without using a radiator cap, you will need the following items:

-A bucket
-A hose
-A garden hose
-A funnel
-An air compressor
-A sealant (such as RTV or silicone)


Bleeding your cooling system can help to remove air from the system, which in turn will help to improve air flow and cooling. There are a few different ways to bleed your cooling system: using a radiator cap vent tube, using the engine coolant temperature sensor (ECT) or using an ice cold water bottle.


Bleeding your cooling system is a big problem that can lead to major problems. In this article, I’m going to show you how to bleed air from your cooling system without using a radiator cap. This is by far the easiest and most effective way to do it, and it will save you time and money in the long run. So if you have a cooling system that’s not working properly, give this method a try first!