park your car on a steep hill and let run until you see or hear all the air bubbles come out
Have you done a rebuild? Is this why your trying to purge the cooling system? Typically you will need to run the vehicle till the temp gauges reads near overheating, then allow the vehicle to nearly cool and remove the radiator cap. This allows air pockets to be pushed through the system. You can also run it to normal operating temperature and slowly crack the radiator cap allowing the system to expell excess pressure.
Most likely you are getting air introduced into the cooling system. This usually comes from a bad head gasket that allows cylinder compression to leak into the cooling system through one of the cooling ports in the cylinder head. The only way to fix this is to replace the head gasket. Have a professional diagnose your car first to verify this is the problem before shelling out the $$$ to do this major repair. Another symptom of this problem would be your temperature gauge creeping up towards hot, then dropping down all of a sudden, over and over. This would indicate a "air lock" in the system, and purge, " trapped air escaping" further indicating a bad head gasket.
Partial list of Possiblities: Body damage or Modification causing air flow problem Water pump has internal Damage. Air pocket in the cooling system, many cars require a special Purge Proceedure. Blown head gasket or Cracked Cylinder head. A Good Repair SHop can test for this quickly and easily. Bad or faulty cooling fan. If the car has a cooling fan clutch they fail also. And many other reasons.
I assume you are talking about removing trapped air from the cooling system. Park uphill or jack up the front of the vehicle. Remove the radiator cap, turn heater control to hot, and start the engine. Keep the coolant level full, while the engine runs. Watch for air bubbles escaping from the radiator. When you see none, all the air is purged. It may also have a Schroeder valve somewhere on the cooling system at the highest point that can be used to purge air.
Just keep the coolant level up and it should take care of itself. If you have run out of coolant, find out why. After you have repaired the problem, fill the radiator as best you can, fill the coolant reservoir to the full line then watch the reservoir. If the level drops, add more before you start the engine. The coolant system will purge itself of any air if there are no leaks.
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