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Depends on the ambient temperature. Check a standard r134a chart. Off hand I'm thinking that 300 is a little high, but I don't live in Arizona either.
 

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1999 Escort LX 5 spd
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Discussion Starter · #6 ·
So far at 80 degrees ambient temp I can only get it to 32psi at idle on max ac and close to 40 on the regular ac setting. It sounds like there's a leak near the high side port, but its not the port. It does it for a few seconds after turning car off. It gets cool but not quite right yet. Gonna look into the air noise coming from the front driver side of the car. I hope its not my condenser.

Low side rises to around 70-80 ish when ac turned off.
 

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1999 Escort LX 5 spd
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Discussion Starter · #9 ·
I finally got it working well. I've seen it drop to 37f in the vent, averages 39-41f on the highway. The car is still not freezing inside though when its warm out. I figure that's a limitation of an economy car ;)

Oh note, my dads 2018 chevy 5.3 silverado averages 43f on the highway but gets a lot colder inside the cabin. He has a lot better airflow from the vents.
 

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1999 Escort LX 5 spd
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16 Posts
Discussion Starter · #10 ·
Sorry about the double post here. It sits around 47psi on max ac at about 95f outside temp. Seems about right I guess. If I get it higher(psi) the vent temp rises several degrees. Same with less psi than 47psi. So 47 must be the sweet spot.
I used a ac temp gauge in the vent to get it as close to perfect as possible. O Reilly has them for about $8.
 

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chevy silverado uses about 2.4 pounds of refrigerant, and the overall heat load capacity is 3x what an escort is, so ya.... its going to be more 'colder'.. anything more than 20 degreese below ambient is considered 'good'. so 37 in the vent is exceptional
 

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1998 ZX2
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chevy silverado uses about 2.4 pounds of refrigerant, and the overall heat load capacity is 3x what an escort is, so ya.... its going to be more 'colder'.. anything more than 20 degreese below ambient is considered 'good'. so 37 in the vent is exceptional
I agree. On most cars I've noticed that the vent temps are usually low to mid 40's after a proper evac and recharge.
 
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