ShadowsPapa
Well-Known Member
- First Name
- Bill
- Joined
- Oct 12, 2019
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- 180
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- 29,411
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- 34,983
- Location
- Runnells, Iowa
- Vehicle(s)
- '22 JTO, '23 JLU, '82 SX4, '73 P. Cardin Javelin
- Occupation
- Retired auto mechanic, frmr gov't ntwrk security admin
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- 3
Well said. When I was doing automotive AC in the 70s and 80s, I had a thermometer sort of like a small meat thermometer. ( I still have it and my old AC tools). It had a dial, and a long stem likely made of aluminum because aluminum is a good conductor. You stuck the stem in the duct and waited a couple of minutes. If it hit about 37-40 you were good.You’ll want to use a real thermometer, put it in the vent, let it run for at least 10 minutes. There’s no chance in hell that the air coming out your vent is 4.7F. Celsius would make sense, but no car AC on earth puts out below freezing air. 4.7 degree air directed at your face would injure people.
That's measuring the AIR temperature and you know to get 40 degree air the evaporator coils have to be colder than that because there is no way to get perfect heat transfer and you are moving the air past the coils so it's not going to lose as much heat as it could if it were sitting around the coils not moving.
Those non-touch or laser thermometers, at least mine, says not good for measuring the air temp. It measures the temperature of solid objects, not air. And there's no way you are going to get to even 10 degrees on these because moisture in the air would freeze instantly on the evaporator.
Go look at the YT videos where people throw water into the air, and the response to an AZ video showing an egg cooking - someone in IL said "Oh, look at this" and broke an egg and let it fall and it froze. Anyway, on a humid day like today where the dew point is close to the temperature as it is - your evaporator is going to freeze over with the water in the air even at only 25-30 degrees. Heck, I had a carburetor freeze up on a 37-38 degree day! The throttle stuck solid at 2,000 RPM and opened the hood to see ice on it.
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