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A/C Temp Issues

Posted: Sun Jun 28, 2020 2:21 pm
by bjanicek
My A/C doesn't blow as cold as it use to. Was told it should blow around 35F at full blast. Usually only blows around 40-45F now. I live around sea level, somewhere around 500-750ft. I recently took a trip west and was around 4000-7000ft and the temp read around 26-30 and felt great. From my understanding, it should be the other way around. Any ideas what could be the issue? I did a recharge last summer and had no change. I know the humidity in the mountains is less than at home too.

Re: A/C Temp Issues

Posted: Sun Jun 28, 2020 2:31 pm
by Dougflas
If you post your vehicle and year, it would help. 35* is kind of close to freezing. Most vehicles are 40to 42*. If I were you, I would recover the refrigerant and weigh in the proper amount. That way, you can eliminate charge as a problem. 40 to 45* is satisfactory. If you slow down the blower speed, the air is flowing slower thus it is in contact with the evaporator for a longer time and is thus colder.

Re: A/C Temp Issues

Posted: Sun Jun 28, 2020 4:30 pm
by B52bombardier1
I was at 42-43 F here in Louisiana yesterday at about 150-200 feet above sea level. Very humid air in the summer. I think my temps would be a little lower if it was less humid around here but overall, I'm happy at 42 degrees at the center vent of my 70 El Camino running 2000 RPM in a modern R134 system.

Rick

Re: A/C Temp Issues

Posted: Sun Jun 28, 2020 5:17 pm
by Cusser
bjanicek wrote:Usually only blows around 40-45F now.


I'm not sure you have an issue !!!

Re: A/C Temp Issues

Posted: Sun Jun 28, 2020 8:55 pm
by Tim
I was told I'd make a couple of million bucks off hoarding T/P. :D

Re: A/C Temp Issues

Posted: Mon Jun 29, 2020 11:21 am
by Al9
Turning water vapor into liquid water (what takes place upon cold evaporator fins) is an exothermic process, so perfectly normal for vent temperatures to get up in humid and hot weather.
On the other hand, knowing which car it is is important because there are compressors that are able to actually adjust the maximum attainable evaporator coldness according to discharge pressures (dependent upon condenser heat load), and these compressors suffer wear and tend to lose maximum cooling capacity as the piston-cylinder wall clearance increases more than with other kinds of compressors.