Expensive tool like which type? Are you thinking about scan tool? I have autel scan tool. Which can analyze the lice data pid of the A/C module and Engine Module, all that matter is the sensors to select for this info to display and record.

Metering device? You mean the manifold gauge or what?

my ac blows hot on freeway, Cool in town what could it be.?.and Cool in park..?

Compressor has been changed yet still...

Thanks