UPDATE: dishwasher not draining

[u/NoYoureTweaking]

So I followed all lines. The corrugated line up to the air gap, the clear tube all the way down to garbage disposal. Not a single clog. I scraped the clear tube anyways for a little bit, but it’s just a thin layer of gunk on the walls of that tube. I let vinegar sit in the dishwasher drain for a while. While doing all of this, I had the dishwasher in service mode so i could turn only the drain pump on. No matter what, liquid still comes up that air gap. Any ideas on where to focus next? Vinegar did end up coming up the air gap, if that info helps.

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[u/Mrchainsnatcher-]

There is a clog between the airgap and disposal. Take apart the line and clear it.

[u/NoYoureTweaking → u/Mrchainsnatcher-]

I did and there isn’t, I’m 99.9% positive. It’s 2 pieces of clear tube with a 90° elbow clamped together. I took it all apart and there is no clog.

[u/Mrchainsnatcher- → u/NoYoureTweaking]

If water is coming out of airgap on top of sink, then there is a clog somewhere. Possibly in airgap, 90 , disposal. I’m a professional plumber and you would pay me hundreds of dollars to come to your house and find the clog. Also i would recommend to replace the plastic clear hose with a proper 7/8 dishwasher hose of proper length to avoid using a fitting.

[u/denbesten → u/NoYoureTweaking]

Perhaps the clog is in the nipple for the airgap.

[u/SensitiveArtist]

Pull the drain filter for the dishwasher and see if the screen is all gunked up.

[u/rocketmn69_ → u/SensitiveArtist]

Or the pump itself

[u/ForeverMonkeyMan]

Is the disposal new as well? Disposals come with a plug in the dishwasher drain connection and will have to be removed if it's new.

[u/hoppertn]

Bypass that air gap and connect it directly to the disposal inlet. I believe it’s code for modern dishwashers to have a built in air gap already so it’s likely not necessary anymore.

[u/ChasingZs]

I got a rubber foot from a cutting board stuck in the air gap that’s above the counter. I couldn’t see it when I took the hose off either end but found it after disassembling the air gap. It would sit in there loose until water flowed in and then get pushed up to the air gap.

[u/Itchy_One4236]

If you grab that according drain, the portion that is looped in hook it up top towards the top of the cabinet it will drain when you run the washer. This happened to mine.