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Q:

location on 1999 Mercedes-Benz ML430

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
location temperature sensor and expansion valve ?
(1) Answer
Here is a link to alldata for some repair info, but Mercedes is pretty tight with their stuff, so you may have to go to the dealer or a good A/C shop.

http://bit.ly/alldata_repair_manuals