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Keith, I would be interested in the data from this experiment. If you compare the temps coming out of the vents from the two vehicles without the A/C on what do you get as a reading. Here's why I ask. If I turn on just the fan in my truck whether or not I have it set on recirculate or fresh air...

Thanks. After posting I found out that the compressor should come pre-charged with the correct amount of oil. It may say on the compressor how much this is. It is usually a small amount, e.g., 300 cc. If the system is evacuated for service then some or most of the oil would have come out...

For those of you who are building your A/C systems or maintaining an existing one, does anyone have any information or reference to adding A/C compressor oil into the system before it is charged. I recall that when I put in a new condenser in my Toyota Land Cruiser I had to add a small amount...

It looks the same as mine. Sorry my photos don't show that well. Freezing cold here and truck not nearby to check. That idler pulley isn't anything special. Just pivots up on a single bolt.

Those photos are from a 2008 C7 CAT, yes it's mine. Thanks Keith!