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

Thanks. Can you give me a starting point? Do I assume if the outside air is 100 and I want 39.7 at the evap, then I should see 220 psi on the high and 43 psi on the low? Or do you draw a line across from the 100 degree / 220 psi to the 45.6 degree / 49 psi and end up with 220 / 49 when the outside air is 100 degrees?
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