A/C Moan - its Diagnostics and Control

Paper #:
  • 2009-01-2054

Published:
  • 2009-05-19
Citation:
Thawani, P. and Liu, Z., "A/C Moan - its Diagnostics and Control," SAE Technical Paper 2009-01-2054, 2009, https://doi.org/10.4271/2009-01-2054.
Pages:
5
Abstract:
Air-conditioning (A/C) induced moan is a very commonly observed phenomenon in automotive refrigerant systems. Since most of the automotive A/C systems cycle ON/OFF four to six times every minute, the A/C induced moan is quite readily audible under engine idle and even while driving, especially under lower engine/vehicle speeds. It is not unusual for an A/C compressor to moan or not, on some vehicle/s under certain operating conditions. Most of the OEMs resolve or suppress the A/C moan potential to barely audible levels. However, under some unique and extreme operating conditions, A/C moan is quite readily induced and often results in customer complaints.This paper discusses A/C moan related root-causes, sources and paths of propagation. A systematic diagnostic test-procedure is also described to diagnose and develop the needed most cost-effective design-fixes. Finally, based on this case-study - some objective targets are recommended to suppress the A/C moan to acceptable levels.
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