Hey guys, My A/C has never been very good if it has been heat soaking all day on a 90 degree day. This morning I thought I would hook up my gauges and see what I got. With the truck warmed up and A/C set on the lowest temp and high fan,.....windows down and Compressor engaged, with an ambient temp of 81 degrees,....I got the pressure readings shown in the below pics. My Mastercool chart suggests 40-50 PSI on the low side and 175-210 PSI on the high side at 80 degree ambient temp.

Thoughts?


Compressor is engaged and cooling

Air temp is 81 degrees F.

 

That's definitely low. I would evacuate the system and refill (or just take it somewhere to have it done)

 

I’d recharge it with a dye, find the leak and then fix it. I found my condenser had a leak when I was changing my fan out

 

Was those pressures at idle or engine reving ?
If at idle add a bit more bring the low pressure to 40 psi
clean wash your rad and you should be good for rest of summer