The Concept

“Differential Temperature Testing” is a powerful air conditioning diagnostic and evaluation technique. It is also sometimes called “Maximum Heat Load Temperature Testing”. During the test, the A/C system is placed under maximum stress (heat load) and a series of temperature measurements are taken at specific points in the system. By testing the system under stress, any underlying weakness in the system is much more likely to be revealed. The results of the temperature measurements are compared to expected values. If any of the results are out of range, three easy-to-follow diagnostic flow charts provide clear diagnostic direction as to the likely cause of the problem, see charts A, B & C. After a repair, you can return the vehicle to the customer with confidence that the entire system is operating efficiently and will be unlikely to suffer premature Compressor failure or comeback.

“Temperature Testing allows us to evaluate the performance of each individual component in the system and check if it’s operating at peak efficiency – to see, for example, if the Condenser and Evaporator are maximizing heat exchange.”

Use Temperature Testing to:

  • Validate the repair after Compressor replacement and confirm that the system is truly fixed before returning the vehicle to the customer
  • Confirm and optimize the system charge level – especially when a replacement component such as a Condenser is significantly different from the original unit.
  • Measure overall system efficiency as part of a preventative maintenance evaluation of the A/C system.

Temperature Testing has several advantages over traditional O.E system performance testing:

  • The system is tested under maximum stress – at idle with the doors open. This setup creates the greatest demand on the entire system. An underlying weakness is much more likely to be exposed.
  • Temperature Testing uses the same basic vehicle setup and test parameters for all vehicles.
  • You can use the test both as a diagnostic tool to determine the root cause of a system problem, or to confirm that the system is truly fixed and operating at peak efficiency.

Want more information on Temperature Testing? Check out our Temp Testing on TXV Systems here:

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