AP Astro Pneumatic Tool Company Radiator Pressure Tester & Vacuum Cooling System Kit — 17 Adapters, 0–35 psi Gauge

Astro Tools 78585 is a complete radiator pressure tester and vacuum-assisted coolant purge and refill kit for diagnosing leaks and performing fast, clean coolant changes on most domestic and import vehicles.

This all-in-one kit combines a hand pressure pump, a 0–35 psi gauge, color-coded radiator test adapters, a vacuum purge/refill assembly, a universal adapter, a temperature gauge and a blow-molded carrying case. It’s engineered so technicians and DIYers can pressurize the cooling system to check for cap or system leaks, then vacuum-fill the system to reduce air pockets and speed up coolant replacement. The vacuum connection is shaped to work with the majority of radiator openings, while the set of 17 test caps and two additional cap adapters simplify quick matching to vehicle-specific necks.

How does the pressure tester find cooling system leaks?

The pressure pump pressurizes the cooling system through the appropriate test cap while the included gauge monitors pressure up to 35 psi (2.5 bar). Sustained pressure loss signals a leak in hoses, clamps, radiator cores, heater cores or the radiator cap. This controlled test helps pinpoint whether the cap is holding pressure or if another component is failing.

• Hand pump with hose and quick coupler for safe pressurization
• 0–35 psi gauge for visible, accurate readings
• Color-coded cap adapters to test original radiator cap sealing
• Quick pressure release for safe depressurizing

How does the vacuum purge and refill tool speed up coolant changes?

The vacuum purge/refill tool creates negative pressure to draw old coolant out and pull new coolant into the cooling system without trapping air. Filling under vacuum minimizes foam and air pockets that can cause hot spots and erratic temperature readings. The process is faster and cleaner than traditional drain-and-fill methods.

• Vacuum-assisted purge removes trapped air and old coolant
• Universal adapter fits most radiator necks for broad compatibility
• Cleaner refill with less spillage and fewer top-ups needed
• Temperature gauge included to monitor system during service

What vehicles and scenarios is this kit compatible with?

This kit is intended for a wide range of domestic and import passenger cars, light trucks and many SUVs. The 17-piece cap set plus blue and black adapters cover the most common radiator necks and original cap sizes. It’s useful for routine maintenance, pre-purchase inspections, troubleshooting overheating, and verifying radiator cap function after repairs.

• 17 test caps for broad vehicle coverage
• Additional blue and black adapters for original cap confirmation
• Universal vacuum adapter reduces the need for multiple tools
• Blow-molded case keeps components organized and transportable

How do I use the kit safely and effectively?

Always work on a cool engine and release system pressure before removing any caps. Select the correct test cap, attach the pump assembly, and pressurize to the specified value for the vehicle; observe the gauge for drops. For filling, connect the vacuum refill tool per instructions and draw the cooling system under vacuum while adding fresh coolant. Follow vehicle manufacturer torque and fluid specifications.

• Work only on a cool engine; relieve pressure first
• Match the correct test cap before pressurizing
• Use the quick release to depressurize safely
• Follow coolant specs and disposal rules for used fluid

Who is this for: Professional mechanics and knowledgeable DIY enthusiasts who perform cooling-system diagnostics and maintenance will get the most value from the Astro Tools 78585 kit. It’s aimed at users needing reliable pressure checks, cap testing, and a vacuum-assisted refill option that reduces air entrapment and speeds up service. The compact blow-molded case and broad adapter selection make it suitable for shop use, mobile technicians, and home garages handling a variety of domestic and import vehicles.