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Originally Posted by leathermang
That starting the R12 through the line with it attached but on lightly....and then tightening it was the old style way of doing it...
I think they have new hoses ... which I don't have yet... which are designed to either avoid that or minimize the amout of R12 vented to accomplish that goal...
But I am surprised that that was not covered in the 609 test.. ???????
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I didn't find much of the information in the 609 study manual useful for actually working on A/C. You need to know what color cylinders different refrigerants are stored in, a bit about the ozone depletion theory, flammable refrigerants are against federal law in automotive A/Cs, cross-contamination of refrigerants is bad, etc. Nothing in the test actually tests ability to do A/C work, or knowledge of how A/C functions. Remember, we're dealing with the federal government here, so don't expect it to make too much sense 
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1982 300D, black w/ palomino leather, 203K
2001 E320, champagne, 105K (Mom's)
1999 Dodge Dakota, squeaky & battered, 142K
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