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Old 08-31-2001, 10:54 PM
be459 be459 is offline
Registered User
Join Date: Jun 1999
Location: Los Angeles, Calif, USA
Posts: 521
The sight glass is reliable. It will be better if you have a way to measure the amount of R134A going into the system, 15 to 20% less than R12. I use an electronic charging scale. Ebay has them. Here is one from ebay:

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