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HVAC theory front/rear systems

rufusbooth on Thu July 30, 2009 9:25 AM User is offline

Year: 73
Make: GMC
Model: Jimmy
Engine Size: 6.0
Refrigerant Type: r-134a
Ambient Temp: na
Pressure Low: na
Pressure High: na
Country of Origin: United States

I apologize for my ignorance but I was hoping someone might be able to educate me on the finer points of front/rear AC systems in larger trucks like suburbans. I guess really it comes down to education on HVAC operation.

Most front/rear systems I have come across use a CCOT system for the front and a TXV system for the rear. From what I have gathered the TXV system appears to be far superior. Here is the actual question then. Is it possible to run both systems using a TXV? A separate TXV valve on the front evap and a separate one on the rear evap? Is there a theory of operation that precludes the ability to do this?

Long story short I am setting up a full custom front/rear AC system for a blazer and I am trying to educate myself so I can design the system properly.


robs on Thu July 30, 2009 3:04 PM User is offlineView users profile

I don't really know what the advantage of using one or the other is, but if you look at bigger foreign vehicle, like the Armada or Sequioa, they use expansion valves/blocks for both the front and rear since most foreign vehicles are designed with the TXV system.

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