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In Reply to: Retrofitting '89 Celica: Pressures posted by Shawn on July 25, 2001 at 11:03:48:
All R134a is the same. Pyroil is just the brand for Valvoline.. Your pressures are high..The sight glass will never be clear again. Put tape over it and forget it. This is due to the different volume of R134 than R12.. Bring your pressures down to about 175psi on the high side. Monitor the vent temps and slowley increase your pressures, but do not go above 200psi at 80 degrees... Keep the windows open, ac on max high fan.. When you get your best vent temps..STOP..Roll up the windows and fan on lower speed....See what the vent temps are then..