lotta speculation in here, and lots of solid info. I'd say go a bit more if the system isn't operating that great.
definetly clean and inspect the indoor evap fans. and check the coils for debris and clean if needed. check the connectivity of the sensing bulb after the evaporator. inspect insulation on the system piping. fix and replace as needed.
that defrost timer is needed to de-ice the evap. sounds like a smaller hermetic sealed compressor if it's a 120VAC unit.......
just having gauges to put on the system isn't quite enough. you could do more damage by having no low-loss fittings on them, and possibly dump the refrigerant if something goes wrong pulling the gauges off.
temp sensing meter for subcool and superheat..
[QUOTE][i]Originally posted by LAME [/i]
The guys designing cages for the D9 dozer on your Christmas list are going about this a bit differently way then a few rednecks, too much beer, and a JD2:D [/B][/QUOTE]