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Old 05-13-2001, 01:27 PM
stevebfl stevebfl is offline
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The only hissing you should hear from a working system is the refrigerant passing through the expansion valve into the evaporator.

The vacuum used to move doors and such is captive and should normalize once the action has taken place. You might hear the initial switching but it should go away very quickly (1-2 seconds).
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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