Automotive Air Conditioning Information Forum

I got a headache from rolling my eyes when I read "Jiffy Lube". I wouldn't let shops like that do anything to my vehicles - even an oil change !!!

NEVER ADD SEALER OR REFRIGERANT CONTAINING SEALANT, IT CAN RUIN YOUR SYSTEM.


Oh, is this useless? I thought this was a good self-repair method.

It's your vehicle, you can do whatever you want !!!! Yeah, the advertisements claim how "easy" it is to fix your AC system, but won't pay a penny ...

Yes, UV dye - used in low light and with appropriate yellow goggles - DOES work to find leaks. I've only used liquid UV dye or purchased correct refrigeration oil already containing UV dye and used that when installing a new AC compressor. But UV dye is just one tool in the arsenal to find leaks ...

I have never experienced a leaky metal or plastic service-port cap.

I have experienced leaky ones, primarily from broken rubber seal. I even experienced this on a 1966-era refrigerator which stopped cooling in the early 1980s; it used R-12 and had a metal schraeder cap so I just added a can of R ...

I agree that there are different-sized caps and schraeders. Maybe cost-effective for a shop at $60, and maybe worth it for 1234yf. Especially as an upsell for a shop.

But my three vehicles are R134a, and one on R-12.

With an electronic leak detector, one can readily determine if refrigerant is leaking past the caps.
https://www.ackits.com/tools/electronic ... -43-mt2734

RossL wrote: Sun Jul 05, 2026 6:06 pm Duct temperature 38-42.

If 38-42F, why are you complaining ???

You need to find a shop that services R-12 refrigerant; they would have equipment to pull out the remaining R-12 and weigh it, to determine how low your charge is.

From your pressure readings and that your high side line is only warm and not hot, plus your pressures (if measured at about 2000 rpm ...

Tim wrote: Mon Jun 22, 2026 7:23 am 2019 Tundra gets 11.5.

Mrs. Cusser's 2014 Yukon Denali with 6.2 engine gets 16mpg unless she's towing a horse. Hopefully its 6.2 engine with AFM is more resistant to the lifter issues of the later years. I did install an AFM disabler module.

I had locked all the threads for a short time. Just turned the main section back on. I'm very busy and can't monitor the site like I once did. John said he would help in that regard. Nice old truck, sure it gets better fuel mileage than my 19 Tundra. :)

Actually, the carbureted 1988 Mazda truck ...