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Originally Posted by 2000CAYukon
The expansion valve (also known as the orifice tube) is inside the ac lines (on trucks without rear ac, then there is only one expansion valve).
You will need to evactuate the system, replace the expansion valve for the rear ac (or replace both!) , check for leaks, and recharge the system.
//2000CAYukon
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Again, thanks for info - is this expansion valve in the lines near the rear a/c controls? I looked through my Haynes manual, and I just as well be perusing Readers Digest when it comes to this. Is the access behind the rear ac controls, or over by a door? Doesn't look very simple from what I'm seeing.
Thanks in advance.