Question about 2006 GMC W3500

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Air conditioning never runs real cold when its hot outside, I have a new compressor, it even did this when it was new, dealership says its normal for that truck, cant be true can it?

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Well, sometimes. Here it is in a nutshell:

first physics dictates that in order to have cooling, the refrigerant MUST change from a liquid to a vapor or gas, and back. This is determined from a chart. In essence, at a given MEASURED abmient temp, it takes xx pounds of force to compress the vapor into liquid. And there is similar need at the expansion valve, to have the ref. turn into a vapor.
These need to be measured, then you will know if the system is functioning correctly.

If so, then you need to measure the discharge at the vent temprature..Involved are several things, here. The heater core is often always hot, but ducted closed. any ducting issues let heat go through.
More often overlooked is OUTSIDE air as a source. You can only change the terprature of air so much during the brief time that the air is touching the evaporator coils (like heater core, but the A/C part). This is why the recirc option is available, noisy but cooler faster....

Posted on Sep 05, 2010

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Posted on Jan 02, 2017

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I think you have a similar problem to mine. At highway speeds is when it happens. And it is not blazing hot? Right?
Your evaporator is freezing up - as this happens the ice surrounding it prevents the flow of air over the evaporator coils and the result is warm air coming out of the registers. If I turn off the AC for about ten minutes and let unit melt the cold air comes back. This does not occur in stop and go driving.
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