Gates 31377 Engine Cooling System Pressure Tester Adapter

Radiator Cap Tester Adapter for Cooling System Service

The Gates 31377 radiator cap/cooling system tester adapter is a threaded cooling system adapter used with a radiator cap and cooling system tester to service multiple component sizes. Its 48mm x 3mm threaded design helps connect the tester to the correct radiator cap or cooling system opening on select Audi, Volkswagen, and Porsche applications.

For technicians working on Audi A8 Quattro, Audi A6, Volkswagen Jetta, or Porsche 924 cooling systems, this adapter provides the proper interface for pressure testing and radiator cap evaluation. Gates 31377 is built for use with the Gates radiator cap/cooling system tester line and is identified by the 48mm x 3mm threaded specification.

Key Features

• Engine cooling system pressure tester adapter
• 48mm x 3mm threaded connection
• Used with radiator cap and cooling system testers
• Attachment type: cooling system adapter
• Fits select Audi, Volkswagen, and Porsche cooling system applications
• Gates part number 31377

Product Details

The Gates Radiator Cap/Cooling System Tester Adapter line is made to accommodate multiple sizes of cooling system components during diagnostic testing. This adapter helps bridge the tester to the vehicle’s radiator cap or cooling system connection point so pressure checks can be performed on the cooling system. Gates 31377 is a direct-fit style service adapter for specific threaded applications, including many Audi and Volkswagen models from the 1980s through early 2000s, plus select Porsche Boxster and 924 applications.

This part cross-references Anchor 3116 for the same application.

What This Adapter Helps Diagnose

• Cooling system pressure loss
• Radiator cap sealing concerns
• Leaks at the cap or tester connection point
• Service issues on threaded cooling system openings
• Testing needs on Audi A8 Quattro, Audi A6, and Volkswagen Jetta cooling systems

Installation Notes and Tips

Use Gates 31377 only with a compatible radiator cap/cooling system tester. Verify the thread size and component style before testing; this adapter is specified as 48mm x 3mm threaded. Confirm vehicle application details for the exact year and model, especially on early Audi A4 and A4 Quattro listings noted in the fitment data.

Compatible With: 1997-2003 Audi A8 Quattro, 2001-2003 Audi S8, 1997-2000 Audi A8, 1995-1997 Audi A6 and A6 Quattro, 1980-1990 Volkswagen Jetta, and other listed Audi, Volkswagen, and Porsche applications.

Quality Assurance

Gates supplies service tools and adapters for cooling system diagnostics, and this adapter follows the brand’s specified threaded fitment and application data for accurate tester connection.