Automotive Air Conditioning Information Forum

He said he never had it serviced and ac was running perfectly but then he left car running amd came back 5 minutes later and the ac was not blowing cold air. Ac compressor kicks on for a second then goes off.
Then I presume no sealer was introduced into the system.

As a first step, I suggest ...

The problem might be elsewhere, but right off the bat, it sounds like a gross overcharge to me.

Has this system ever been serviced?

The product you linked to is the A/C QuickCaps.
Maybe you can answer my question about it.
Can the top of the device be turned to screw the o-ring seal down into the rim of the service port, like the FreezeCap device?
The top has a hexagonal, bolt-head shape, which makes it look like it is ...

To avoid the risk of stripping the threads or cross-threading, I turn the caps in reverse (left-y loose-y). When I feel the cap "bump" over the first thread, I proceed to thread them on (right-y tight-y) and snug them up.

I use Nylog Blue on every o-ring, gasket, and threaded connection, including Schrader valves and valve caps.

The caps are indeed what forms the final bubble-tight seal, not the Schrader valves. Carefully examine your existing caps to ensure that the sealing rings are in place and intact (they're ...

IMHO, the advice Cusser posted is 100-percent correct.

If you have the knowledge, skills, and tools to work on the system yourself, I suggest concentrating on potential leakage points first. Leaks could be anywhere, but I would focus my attention on the condenser, the compressor shaft seal, the ...

The process you described earlier, plus the addition of Ease Release, sounds very promising. The only potential issue I can see is maintaining the PUR foam to a uniform thickness due to its expansion properties. I suggest doing a trial run on a disposable substrate first.

Let us know how it goes.

Option 1: I've never tried either option, but how about spray-on foam-in-a-can, the inexpensive type from your local home center that's designed specifically for sealing around windows? Unlike expanding foam that will fill gaps one inch or wider, the window variety features minimal to no expansion ...

Follow up:
A bit of research suggests that NyLog Blue would not be good for anti-corrosion protection on bolts?
Nylog Blue (NB) is formulated from a blend of very thick, extremely sticky refrigeration oils that hang on tight and don't harden. It's compatible with R-134a and R-1234yf (Nylog Red is ...

To ensure a leak-free system, I use Nylog Blue on every o-ring, threaded connection, Schrader valve, Schrader valve cap seals, etc. "A little dab will do ya."