My air conditioning is not working. The clutch is not engaging. on 2005 Ford F-350 Super Duty

The local auto parts store said it could be the interruptor commutateur switch. I bought the switch, but I dont know where the switch is located on my 2005 ford f350 6.0 diesel

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3 answers 2 comments
check your freon level
HELLO, I JUST REFILLED FREON. IT IS READING 45 PSI
HELLO, WITHOUT THE COMPRESSOR RUNNING THAT IS NOT ENOUGH PSI. Parts store 'mechanics' are often wrong with diagnoses but good at selling parts, even if they are the wrong ones! See a repair shop and save some money.
POSS LOW FREON OR BAD CYCLING SWITCH. SEEK DIAG COULD ALSO BE SEVERAL OTHER ISSUES
Shop with proper info and equipment will save you lots of time , aggravation , and money!