If the vent temp is 54 degree when the external temperature is 100 degrees then the system is perfectly fine. At 100 degrees ambient, a vent temperature anywhere between 52 and 60 degrees is considered normal.
https://forums.anandtech.com/threads/is-my-a-c-cold-enough.311169/
When we do home inspections, we expect the temperature at any vent in the house, with the air conditioner in cooling mode, to register 20 degrees below the ambient temperature… in the room.   Typical supply air temperature directly at the A/C unit air outlet is about 55 deg F dry bulb temperature.
http://www.answers.com/Q/What_is_the_air_outlet_temperature_for_auto_air_conditioning
In the summer as the temperature increase…s, setting your thermostat to a higher temperature will save you money. Often people will raise the thermostat to around 80 degrees Fahrenheit while they are away from home working or at school.
http://www.answers.com/Q/What_is_the_air_outlet_temperature_for_auto_air_conditioning
I have a 2000 Nissan Frontier Desert Runner pickup. Last year in 115 degree weather, which is what we have in Phoenix Az, I was nice and cool with the air on. This year it was not the case so I took it to the dealer. They said one of the componets had moisture so they evacuated and recharged it 3 times and I paid $260.
http://www.justanswer.com/ford/0rhxx-cold-air-temperature-coming-air.html
The climate control is set at 71 degrees on a rainy evening when the exterior temp is 74 degrees and the fan is blowing and blowing trying to cool the car. Raise the temp to 73 and the fan calms down to a normal level, but the car will not be cool inside.
http://www.automotiveforums.com/t1078696-ac_temperature_at_vents__.html
What is Temperature drop across air conditioning coil? The temperature drop across the coil is dependent on the relative  humidity of the air, the wet bulb reading of the R/A, and the  ambient temperature of the home. But a good… rule of thumb is in  between 17 and 22 degrees Fahrenheit.
http://www.answers.com/Q/What_is_the_air_outlet_temperature_for_auto_air_conditioning
So the compressor was changed and now the vent temp is much warmer than it was before the system was changed. I took it back to the dealer and they evacuated the system and recharged it stating that the Vent temp is 40 degrees. The system still won't cool the car as did the original factory system.
http://www.automotiveforums.com/t1078696-ac_temperature_at_vents__.html
Is my A/C cold enough. Discussion in 'The Garage' started by cmf21, Jul 26, 2009. Can anyone tell me what the AC vent temperture should be on a 04 Tacoma. I just recently bought it and I live here in SW Arizona. Previous owners also lived in SE California and had the system checked about 2yrs prior. The truck only has 46000 miles on it but I don't think the AC feels cold enough.
https://forums.anandtech.com/threads/is-my-a-c-cold-enough.311169/
AC Temperature at Vents??? My 2005 LS V8 with just under 100K on it, had the AC compressor leak out all its oil onto the garage floor. New Compressor time. I made a few phone calls and found that the Lincoln dealer was competitively priced for the replacement and was supposed to use Ford/Lincoln Parts. So I had them do the job.
http://www.automotiveforums.com/t1078696-ac_temperature_at_vents__.html
You know you have a concern since the air used to be cold and now it is not. There is not a document showing what the temperature will be according to outside temperature and humidity. Auto are supposed to reduce the temp by blowing out at least 30 degree cooler air. Anything above this is a bonus. As I stated I have seen the AC blow out in the low 40's.
http://www.justanswer.com/ford/0rhxx-cold-air-temperature-coming-air.html
what temp car air vent
The temperature for car air vent is 40 degrees. Car temperature at Vent is 40 degrees.