I have a 2006 f150 5.4. My AC will work for a while then it will start blowing warm. I know the clutch turns off when this happens because I saw it. According to the autozone digital ac refill kit the pressure is good. Idk why it keeps doing this please help.

 

Welcome, this generally can mean it is low on refrigerant. But could also be the compressor. Its probably best that you take it in to a professional who has all of the correct tools and gauges to check your system.

 

check the air gap of the clutch on your ac compressor

 

If the pressures truly are good (don't always trust cheap gauges, because I've been fooled a couple times in the past into thinking my pressures are good when they were NOT) It may be worth rending a manifold gauge set and checking both high and low sides....,
+1 for checking the air gap, this is the next most likely problem in my opinion. If you don't know what we're talking about just youtube it, there are a few videos, if your air gap is too wide you might be lucky and just remove the small bolt from the front plate, and see if theres a shim washer behind the plate you can remove, and then reinstall the plate and bolt.

 

+1 if you rent the manifold gauges from o'reillys you can really tell a lot.

i knew nothing about a/c, but a few years ago I rented the equipment and watched some videos after a shop tried to upsell me on my 04 stx (said it had a leak smh). i recharged the system myself and 3 summers later it's still blowing ice cold. best of luck with it!

 

Still a problem?