i decided to try a/c pro since when i bought the truck my mechanic said that the compressor had to be charged and quoted be around 150. after reading about this product i decided to try it out since i like to fix my own problems on my truck. i went to advance auto parts asked the guy to show me where to plug it in. then when i got home i followed the directions and it worked great. my compressor went from clicking on and off to not clicking at all. i also get a cool cab in about 5-10 minutes. i highly advise anyone who has a/c issues to try this product. it only takes about 10 minutes to do.