Originally Posted by
kung fu jesus
Re:AC.
I don’t know how extensive your last service was, but by your description it isn’t working properly and likely isn’t the compressor.
The best way I have found to make AC work properly on NA & NB Miatas is to replace all the serviceable parts: condenser, evaporator, seals, drier, pressure switch, evap valve/capillary.
The parts are not expensive, but the labor would be.
Everytime I have done this, I treated it like a full system restoration. The early NAs are easier. You don’t have to pull the dash, but I do so I can clean the centerstack HVAC components and re-seal the flapper/air diverter. It’s also a great time to replace the heater core preemptively.
You can tidy up a lot of wiring, too. Like removing the SRS system, repair any damaged bosses on the dash, re-loom stereo wiring, etc. Pulling the dash is also the perfect excuse for deep-cleaning the carpets out of the car and clean the tub.
I know that sounds like a ton of work, but it’s really not bad at all if you stay organized and take your time.
After living in SOCAL then moving to the humid South, a proper operational AC system was necessary for staying cool and for safety to defog the windows during frequent rain.