Leak Testers for Automotive Air Conditioning Systems

Leaks in the refrigerant circuit can lead to refrigerant loss and reduced performance of the vehicle’s air conditioning system. Therefore, a targeted leak test may be necessary before any repairs or recharging.

Autotestgeräte Leitenberger offers professional air conditioning leak detection equipment for various refrigerants and pressure ranges. This includes solutions for air conditioning systems using R134a and R1234yf, as well as test systems for R744 (CO₂).

Testing an Air Conditioning System for Leaks Using Nitrogen or Formier Gas

During a pressure test, the properly prepared air conditioning system is pressurized with a suitable test gas. The system is then monitored to ensure that the specified test pressure remains stable over the designated period.

A pressure loss may indicate a leak in the refrigerant circuit or in the test setup.

Formier gas can be used to pinpoint the leak location. Escaping test gas can be detected using a suitable electronic leak detector. Typical test points include:

• Pipes and hose connections
• Screw fittings and connections
• Condenser
• Evaporator or evaporator connections
• Compressor and its connections
• Service connections

Thus, both methods complement each other: The pressure test is used to assess system integrity, while the tracer gas leak detection helps locate an existing leak.

Leak Testing for R134a, R1234yf, and R744

The pressure ranges and service ports of automotive air conditioning systems vary depending on the refrigerant used.

While R134a and R1234yf systems operate with comparable but separate service ports, R744 places special demands on test equipment, hoses, couplings, and safety components due to its significantly higher system pressure.

Therefore, only test equipment and accessories designed for the respective refrigerant and the required pressure range may be used.

For repair shops, both mobile test kits and complete leak testing systems mounted on carts are available. Depending on the model, the test pressure, test duration, and results can also be documented or outputted via a test report.

The specific test procedure and the permissible test pressure depend on the vehicle, the air conditioning system, and the manufacturer’s specifications.