How to refill your coolant system without any air locks

Astro Pneumatic Tool 78585 Universal Radiator Pressure Tester & Vacuum Type Cooling System Kit demo on a 328i BMW.
By far the easiest way to refill your coolant system.

Product Description
This “Radiator Pressure Tester And Vacuum Type Cooling System Kit” allows easy testing for leakage in radiator system and quick change of coolant. Its color coded radiator test caps make it easy to choose the suitable test cap for the job. The set includes: pressure testing pump with hose, quick coupler with pressure release, and gauge: test range 0 - 35 psi (0 - 2.5 bar), (1) blue and (1) black radiator cap test adapters to test for original radiator cap leakage, (17) test caps for testing cooling systems on most domestic and import vehicles, vacuum type cooling system purge and refill tool kit for quick change of coolant, universal adapter and temperature gauge.

From the Manufacturer
The Astro Pneumatic 78585 - Radiator Pressure Tester & Vacuum Type Cooling System Kit with 78581 Adapter allows easy testing for leakage in radiator system and quick change of coolant. Color coded radiator test caps make it easy to choose the suitable test cap for the job and special design of vacuum purge & refill tool connection fits nearly all types of radiator opening. Unit is suitable for domestic and import vehicles. Set includes: Pressure Testing Pump with Hose, Quick Coupler with Pressure Release, and Gauge - Test Range 0 - 35 psi (0 - 2.5 bar); 1-Piece. Blue and 1-Piece. Black Radiator Cap Test Adapters to test for original radiator cap leakage; 17-Pieces. Test Caps for testing cooling systems on most domestic and import vehicles; Vacuum Type Cooling System Purge and Refill Tool Kit for quick change of coolant; Universal Adapter; Temperature Gauge and Blow Molded Case.

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--J