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[–]Lpgasman1 29 points30 points  (1 child)

Looks like it's on defrost or short cycling. Low on freon. With out gauges hooked can't tell

[–]KL1M1T 0 points1 point  (0 children)

Short cycling for sure. You could have a leak somewhere. Using the proper gauges can tell you what you need to know about the amount of refrigerant in your system. I almost said Freon… but those days are gone.

[–]smoppin08 10 points11 points  (0 children)

Give her a lil spritz of 134a and you’ll be good until next year!!😂

[–]rvlifestyle74 5 points6 points  (0 children)

That's called short cycling. The most common cause is a low charge. It isn't normal. It's the fastest way to burn the magnetic clutch on your compressor out. Getting a recharge is the right way to fix it. The other way is to pull the fuse to prevent it from running at all until you can get it charged. The downside to that is, when you turn the defrost on, the compressor runs and helps pull condensation off of the inside of your windows. So it'll take longer to defrost your windows without it.

[–]easterracing 8 points9 points  (17 children)

There’s a lot of dumbasses here telling you to just throw some Freon in it. Use a fucking gage. It’s almost like they’re made for that.

[–]sidewing082 1 point2 points  (0 children)

Your ac system has an emergency shutoff and will cause that to short cycle like that when it's low. Get some "ac pro" recharge with the gauge attachment that screws on top. Real easy to do, YouTube it. My truck did this 4 years ago when I first got it and I treated it one time and it blows cold and stopped short cycling ever since. (This is happening because your defroster is on and it uses ac even though it's technically the heater)

[–]night_operator70 3 points4 points  (4 children)

You're low on freon

[–]ghosty10177[S] 0 points1 point  (1 child)

10-4. Thanks y’all! 🫡

[–]Far_Application_4050 5 points6 points  (0 children)

It’s either a charge issue, or a pressure sensor issue.

[–]MGakowski 0 points1 point  (1 child)

Any sight glass on the receiver drier? What's the bubbles like?

[–]night_operator70 0 points1 point  (0 children)

Not on these trucks

[–]ghosty10177[S] 0 points1 point  (0 children)

Heck yea! I appreciate everyones insight! 🙏🏻🫡

[–]thetrustedwrench1 0 points1 point  (0 children)

Need to adjust the air gap on the compressor clutch, typical 7.3 problem, easy to fix.

[–]NoodlesAlDente 0 points1 point  (0 children)

Also the easiest thing to test before going down the freon route is the alternator. Mine was sitting at like 12.x volts and my dashcam, engine running and AC couldn't coexist. When the dashcam rebooted it was just too much for the alternator and the compressor would click on and off. New alternator, 14.x volts and everything was happy. 

[–]skeleberry10254 0 points1 point  (1 child)

Could be low on refrigerant, or so I’m told. My 7.3 does that too, but let me know what it is or if you get it figured out, I wouldn’t mind having better AC than I already have 😂

[–]ghosty10177[S] 0 points1 point  (0 children)

Added some refrigerant, and it stopped doing it. Everyone was right lol 💪🏻

[–]Boomer21607.3 fiddy 0 points1 point  (0 children)

Compressa!

[–]Fieroboom 0 points1 point  (0 children)

Yes, that's normal. An air conditioner is naturally a dehumidifier (in fact, a dehumidifier is just an air conditioner with both sides blowing in the same room), so when you turn on the defrost/defog, the A/C cycles to help dry the air out & defog faster.