Decided to play around with AC pressures and fan settings to make a meat locker out of my Tahoe and it did not disappoint. Over charged just a hair at 58psi on the low side and around 275on the high. Ambient was probably close to 210 maybe more with the truck running in my shop for close to an hour (exhaust was routed outside). Anyway the big change was having fans second stage come on before the thermostat. With stage one fans running at idle and ECT around 180 I was only showing mid 50s-60* from the vent dial thermostat and around 50* from my IR thermometer. Having stage 2 fan kick on at idle the temps drops to 38-40* on dial thermostat and deep into the negatives when shooting it with the IR thermometer aimed at the inside of the vent.
What surprised me was I saw no noticable different in condenser temperatures when measuring with the IR thermometer from the grill side. They never dipped below 90* or above 100* no matter the fan speed which I thought was odd. I figured fan speed would directly correlate to condenser temperature and therefore colder vents.
Oh well its meat locker cold now and might snow inside the vents.
Don't know how accurate the IR thermometer reading is down that cold but it seems extremely accurate for other things so take it how you want.
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