Hello everyone. I'm sure that there's plenty of these kinds of post to read but I felt like mine issue isn't quite the same as similar posts that I've seen.

For reference, this is on a 1996 Ford Ranger XLT EXT Cab 2.3L In-line 4cyl

My issue is that A/C obviously blows hot air. However, the A/C clutch does click on and off which tells me that it works but the system may be low on coolant.

I've taken the truck into a shop to have them test for leaks and refill the system. They couldn't find any leaks so they flushed the system and put new coolant in and yhe A/C blew cold air for about 2 weeks. After that, it went back to blowing hot air.

My question is: what's causing it to go back to blowing hot air after a recharge? Obviously the system works but it just doesn't stay working. One can assume that it's a leak some where, but I'd like to know which parts on the A/C system tend to go bad sooner than the rest.

If anyone has had a similar issue to this feel free to leave a comment; your advice is most welcome.

Answer: A leak they just didn't find.

Did they replace all the O-rings? And schrader valves? Do a vacuum pressure test?

Did you compare your Hi/Lo side pressures and your compressor cycle times to Ford's charts for A/C? Those charts were posted in many A/C threads, here.

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1997 4x4 Mazda B4000 SE, Ext.Cab

Could I run some stop leak through the system? I've been reading that certain brands of stop leak are highly effective against small leaks, which would be the case with my leak(s). After a recharge, my A/C will blow cold for about two weeks before it starts blowing hot. Perhaps stop leak could fix it permanently?

Never run stop leak in an ac system. You will get more problems from it than benefits

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1999 Ranger 4.0 and extreme Snap-on tool fetish

Really? Would you care to elaborate?

Stop leak will clog the receiver/dryer & the filter.

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2000 Ranger Extd Cab XLT, 4X4 Off Road, 4.0L, Auto, 8.8 - 4.10's, 01 grille & lights swap.
69 Mustang, modified 5.0, & 5spd.(project)
99 Explorer Sport, 4.0 SOHC, Auto, 8.8 - 4.10's, PW, PL, PM, Cruise, Tilt. (Wife's DD)
05 F-150 2WD Regular Cab. ( My DD)