I replaced the ac on my 02 suburban with rear ac this weekend. I replaced the compressor, condenser, accumulator dryer, and oriface tube. Flushed the lines under the hood, vacuumed and recharged the system. Heres where im not sure if im just paranoid or not. I can get in the truck with the vent temp at 110 starrt the truck and by yth time i leave the parking lot the air charge is down to 80 another 5 min its down to 60 and another 15 it will get to 40. My question is, whats normal for how fast its suppose to cool off? I know humidity is a big factor, i live in the Louisville KY area where humidity is high when its hot. I just feel like it should cool down faster to at least 60°f. I wound up at an estimated 48-50 oz of freon to get the pressure up past 30psi low. When i was done i had it up to 35 low and 175 high. I may check again to double check.
A few ac questions.
- Thread starter NvrMnd85
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swathdiver
Full Access Member
If under the hood is hot soaked, if the engine cooling fans are weak, the AC will only get so cool before you get air moving across the radiator. I don't know the referigerant specs for your system but you should look them up. Same with the oil.
swathdiver
Full Access Member
40 or 45 is normal. I remember on my other cars, each click was plus or minus 5 degrees and think the low was 45. But it is kinda dependent on the outside air temp and humidity. Mine cools down pretty fast with the rear on too set to 64 in summer and 68 in winter. Tomorrow I'll be running the truck with my Tech2 and will make a note to check the internal air temp numbers for a comparison for you.
swathdiver
Full Access Member
We hooked up the Tech2 after a remote start with the truck idling in the driveway. Outside temp was about 85 and the lowest temp seen internally was in the mid 40s. The commanded state was 35 degrees. During this I discovered an error code, the recirculate door actuator stuck open (Code B0228 Symptom 61), it was moving but out of synch. I used the Tech2 to get it back in synch after clearing the code. Had this happen last year with another actuator. We soon got underway and doing 25 mph through our neighborhood the temps went down to the low 40s, all the actuators were operating within 1-3 counts of commanded state. Called it good and reset the temp from 60 to 68 as we were getting cold! The minimum specs in the manual, going by my foggy memory, showed the system able to cool the outside air by about 25-30 degrees. A healthy system can certain do better than that.
Using the recirculate function helps chill the truck down faster as does running the rear AC. I keep the rear at 68 all the time unless the passengers change it to their liking back there.
Using the recirculate function helps chill the truck down faster as does running the rear AC. I keep the rear at 68 all the time unless the passengers change it to their liking back there.
Ive seen a how to on recalibrating the blenddoor actators but all that info is for the 03+, i don't have the same fuzes on my 02. I pulled the front ac fuze and tried it and don't think it helped (if there was any need for it in the first place, so it may have worked and not helped haha).
Also how fast does the air in your vents start feeling cool? Mine takes a few minutes, im assuming its just because theres such a large volume of freon for the whole system.
Also how fast does the air in your vents start feeling cool? Mine takes a few minutes, im assuming its just because theres such a large volume of freon for the whole system.
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