Is your A/C just *cool* but not *COLD*?

[hirdlej]

They did a full evacuation and refill. All systems checked out (according to them). 1.7lbs of refrigerant was put back in. I interpreted it as "max" cold. I do understand what you're saying though. Are there any techs on here that can tell us what the information I posted means?

[hirdlej]

I called another dealership, their tech was nice enough to look up the specifications on the A/C system for my truck. He went through the tech specs and agreed that the maximum cold temperature that comes out of the vent is 50degrees. Nothing colder.

 

This makes me wonder if it's possible through HP Tuners or EFI Live to make any changes to the PCM or BCM that would allow for colder operation. (I.E. higher fan speeds, compressor duty cycle, etc).

 

Needless to say, I'm not happy

[scott.moody.9401]

Here lately it's been 85-90 F out. The temp gauge stuck in my vent will read 42-44 F after a few minutes of cooling down and on low fan. Starts off around 50'ish when I first turn it on and on high fan.

 

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[mookdoc6]

Not sure out here in Phoenix the AC is on every month other than a couple winter months......I think you would die without AC!

[emeryz28]

I thought this too, then I realized my temperature perception was just skewed and I had the settings too high for what I was looking for. Turn the dial down to 63 and that bitch will get ice cold, atleast mine did!

[FADEC]

Mine seems to run around 40-43F. Thats what it ran this last weekend driving down the interstate with air temps 88-91F. It sucks to have a vehicle that the AC never really works great.

Had one,couldn't deal with it, traded it.

[IncredibleShrinkingFungus]

You folks do realize that if your vents are producing say 50 degrees, That means your evaporator temp is in the neighborhood of 40 degrees. 8 degrees colder and you'll will start freezing condensate on the coil. Once the ice or frost build up you really start loosing cooling. If you get 45 or below consider yourself fortunate. As the coil gets colder the refrigerant pressure gets lower. The low pressure switch cuts off the compressor to prevent freezing the coil. Run you fan on the lowest speed. That will give the evap enough time to cool each molecule of air passing thru it. Yes I know the old days of the A^ compressor and giant evaps and condensers put out fog. We are dealing with smaller fans,coils and refrigerant capacities nowadays

[IncredibleShrinkingFungus]

Another thing to consider is humidity levels. The Ac system has to reduce the latent heat of humidity before it will drop the ambient temp of the air. Just like we feel hotter on humid days. Our bodies have to work harder to get cooled. same thing with air conditioning.

[TX_AT]

Hi guys, I have a 2015 Silverado W/T that has less than 2000 miles on it. I do a lot of short trips 10-20 miles at a time and the A/C has never been what I call COLD. But rather it's just cool and never gets cold enough that it's uncomfortable. My old 2004 Silverado is another story. That truck can blow some seriously cold air!

Today I did some testing. I had a 15 mile drive home from work and I brought along my old trusty thermometer. It was 79 degrees and humid out so I decided to use the air. All the colder I could the vents was around 48-49 degrees. This was mixed driving with both highway (55mph) and idling in traffic.
 
What are you guys seeing for temperature in your trucks coming out of the vents? Is this temperature normal now for these new trucks? Do you think mine might be a hair low on refrigerant?
 
If this is normal, I guess I can accept it. I was just hoping it would be about 10-12 degrees colder to be like my 2004 Silverado.
 
Any information, thoughts or observations would be greatly appreciated.
 
For the record, this afternoon I took my wife's 2008 impala out in the same weather and I was pulling temps around 42 degrees with the same thermometer placed in the center vent.

Have you checked the temperature of your passenger vents?? If you notice a major difference, it's probably the well known door blend issue.

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