Here is a link to gdl's website. If you are handy with a multimeter, and have a friend to help it's pretty easy to find a fault or figure out that it's the module. IMO buying a used module is a crap shoot, and some people have had success with soldering the circuit board in the module. I spent the money and sent mine to GDL, price was almost $200 but it works like a charm and has a waranty. Good Luck, Chuck

http://gdl-online.com/testproc.html

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2000 C230 Kompressor "Frosty"

2007 PT Cruiser
2001 VW TDI Beetle
1999 Landrover Discovery II
1971 Corvette

Gone: 97 Cabrio, 83 240D, 93 VW Eurovan, 95 Volvo 850, 93 Chevy Astro Van, 77 VW Bus, 99 VW Jetta, 74 VW Bus