Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
Publisher: Cengage Learning
ISBN: 9781133612315

Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
Publisher: Cengage Learning
ISBN: 9781133612315


Chapter 55, Problem 11RQ
Textbook Problem

While conducting a pressure test on an A/C system, the ambient temperature is 80°F, the low-side gauge reads low (8 psi), and the high side also reads low (85 psi). Which of these could cause these readings?

  1. Low refrigerant level

  • Normal operation
  • Bad compressor
  • A high-side restriction
  • Expert Solution
    To determine

    The correct statements about pressure test which could cause such pressure readings.

    Explanation of Solution


    Temperature = 80 ℉.

    High side pressure = 85 psi.

    Low side pressure = 8 psi.

    At 80 ℉, the low side pressure should be 86.7 psi and the high side pressure should be 598 psi, required for operation.

    The low side gauge reads 8 psi and the high side gauge reads 85 psi, these readings are below the regular operating reading conditions of the air-conditioning system. This kind of result would be generated due to only one reason that is, the compressor is not functioning or it is broken down...

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