I have an '86 GMC Jimmy Runs great (It should, It's got lots of new
parts!) but A/C is a problem. Operates/blows cold air for 20~30
minutes then A/C Fuse blows. Compressor, drier, and orifice have been
replaced with new GM parts, new PAG oil and R134 refig by
professional. Truck was converted to R134 refrig some years ago when
a rebuilt compressor was installed. Any thoughts? TIA, Speced.