AC temperature at the vents...
 

I just switched over to Freeze 12, and out of curiosity I measured the temp of the air coming out of the vents. (I stuck the thermomoeter right in the panel vent.) Now, this was with an ordinary household thermometer, so I know it's not calibrated to laboratory specs, but it compares favorably (3-4 degrees) to other thermometers I've checked it against. Anyway, the air came out at 38F. Now that seems absurdly low to me, but, the air was plenty cold. Anyone else know the temp on their's, or what it's supposed to be with the original R-12?

I looks like your AC man knows what he's doing..

let a sleeping dog lie, man. not to mention most a/c systems have a shutoff switch that's activated if the air temp falls below freezing.

i remeber my old boss used to freeze my balls off with the a/c in his dodge, right after working out in the 95% 100% humidity all day.

38F god damn, i wish mine was that cold. im getting like 55-60 in the middle of summer. and at night it gets down to 50.

Nice. I like my car to blow out ice cubes.

I should measure mine. I still have the factory R-12 charge, near as I can tell. It's *cold* - on the highway, I have to cycle the AC on and off, or put the heat slider about halfway over, because it freezes me if it's always on.

-=Russ=-

THE POINT is ... you need to ahve 20F of delta between air before the coil and after...

According to the FSM, at 50% RH you should have a temp difference between the inlet and outlet of 20degC (36degF). If humidity is higher than 50% the dT will be less, if it's lower it'll be more.

See page U-41 in the S5 FSM for more info.

good lawd. I just recharged mine with Freeze 12 until it wouldn't take anymore, and it's not nearly that cold...

Honest - It's so cold, that I have to point the vents away from me. Well, it's good to know that Freeze 12 stuff works! My everyday car ('95 Ford Escort) has R-134 in it, and it's not even in the ballpark of the cold in my RX7. By the way, if any of you guys are looking to buy Freeze 12, I got it from sherco-auto.com, in Florida. $49 shipped for 3 cans, ,the can tap and the hose. Individual cans are $9 each.

got mine on ebay for $40 shipped. ebay r0x0rz y0... lol... from "frosty freeze"

all u people in the upper states that don't have to deal with 95F w/90-95% humidity will have a cooler A/C system...A/C systems down here in the south struggle to cool...I can believe that your car got to 38...I could almost get that with my 134A in the cooler days and in the winter season when the humidity is lower and the temps are around 85F...I know the old stuff works way better though--the 134A would take a while to get cool whereas the old would get cold fast...

Hawaii climate
Ambient day time max of 95F
Ambient day time average of 80F
Average humidity 50% to 70%

Original R-12 a LONG time ago...
"Oven" thermometer in center vents
Daytime AC at full blast, normal charge, 55F to 60F
Car sitting in sun for several hours at peak (around 12 noon), 140F
A/C system overcharged by 1#, min temp 39F
Crazy enough to run A/C at night with overcharged R-12, I turned it off after it hit 31F


-Ted

Ted - You mean if the system is over-charged it will go to lower temps?

Yes, up to a point.
Your seals have to be in good shape.
One of the guys who did automotive A/C systems said it was safe if you don't overdo it.
On R-12 systems, on a system that normally takes in 1.5#, you can go over by a pound or so and be okay.
They do this with the new R-134 also.


-Ted