Sin Diesel
New Member
- Messages
- 1
- Reaction score
- 2
- Points
- 3
So I like many others on here was not happy with the performance of my AC system in my '19 2500 Gasser. Living in Las Vegas is hell literally and in the the past two weeks we've been averaging 115 degree highs with overnight lows in the mid 90's. I had my windows ceramic tinted and it did make a difference but nothing to write home about. So I decided to connect my Robinair machine to my truck today and ill gladly share with you all my findings.
Factory Charge Specs:
Ambient Temp: 97' f
Low Side Pressure @ idle: 40 PSI
High Side Pressure @ idle 200 PSI
Low Side Pressure @ 2000 RPM: 20 PSI
High Side Pressure @ 2000 RPM: 205 PSI
Return Temp at center vent: 56'f @ idle and 53'f at 2000 RPM
I knew these pressures were off from what they should be at the ambient temperature so I connected my machine and recovered the refrigerant.
System recovery: 1.06 LBS
System calls for 1.31 LBS
Vacuumed system down and leak tested, no leaks detected.
Recharged system with 1.36 LBS and added .7 oz of PAG 46 Oil.
New Charge Specs:
Ambient Temp: 107'f
Low Side Pressure @ idle: 40 PSI
High Side Pressure @ idle: 230 PSI
Return temp at center vent: 51'f @ idle and 48'f at 2000 RPM
Now I know this isnt the case for every truck, but it wouldnt hurt to put a set of gauges on your system and at least verify where your pressures are at. Ive read some people have found their systems undercharged from the factory. I dont know if the system is supposed to be checked during the PDI inspection or not. That could be the cause. But I will say that on my road test there was a significant difference on the interior temperatures compared to before. So for some of you if this is the case with your system then there is a light at the end of the tunnel lol.
Factory Charge Specs:
Ambient Temp: 97' f
Low Side Pressure @ idle: 40 PSI
High Side Pressure @ idle 200 PSI
Low Side Pressure @ 2000 RPM: 20 PSI
High Side Pressure @ 2000 RPM: 205 PSI
Return Temp at center vent: 56'f @ idle and 53'f at 2000 RPM
I knew these pressures were off from what they should be at the ambient temperature so I connected my machine and recovered the refrigerant.
System recovery: 1.06 LBS
System calls for 1.31 LBS
Vacuumed system down and leak tested, no leaks detected.
Recharged system with 1.36 LBS and added .7 oz of PAG 46 Oil.
New Charge Specs:
Ambient Temp: 107'f
Low Side Pressure @ idle: 40 PSI
High Side Pressure @ idle: 230 PSI
Return temp at center vent: 51'f @ idle and 48'f at 2000 RPM
Now I know this isnt the case for every truck, but it wouldnt hurt to put a set of gauges on your system and at least verify where your pressures are at. Ive read some people have found their systems undercharged from the factory. I dont know if the system is supposed to be checked during the PDI inspection or not. That could be the cause. But I will say that on my road test there was a significant difference on the interior temperatures compared to before. So for some of you if this is the case with your system then there is a light at the end of the tunnel lol.