Reply to "Orignal R12 A/C Pressures Readings?"

Do NOT add in 30 sec to 1 minute bursts!! That is EXTREMELY dangerous. Without a scale you have no idea on just how much refrigerant you are putting into that pump, or its hoses.

If you are recharging an already partially charged system, go slow as you watch your pressures and temps. If your condenser is in the rear, have the deck lid open, if up front have the front trunk open. This keeps air going across the condenser since the car is not moving. Make sure the condenser fan is running.

Personally, I would change the dryer with one that has a sight glass, another tool to help balance a charge since you want liquid going to the Txvalve. George is correct about the receiver/dryer good and cheap practice to just replace them. Advise one with a pressure safety switch. It is very messy when a line gives way under pressure, and did I say dangerous? Clean up of all that oil is a bummer.

Read up on superheat charging to get the peak performance of these systems, do not go by outlet air, it is never accurate for charging purposes. The temp at the evap copper outlet is the most accurate.

Repeat, do NOT just dump refrigerant into a system for any count of time, that is just plane dangerous.

Hope that helps a bit,
Angelo