I NEED TO FIND AN AIR SWITCH FOR A KOHLER K-792S WHIRLPOOL TUB

I don't know this specific tub, but here's the pictoral. The button (90105) should come out of its base, held by friction of O ring. This should allow you to disconnect the pressure line. If you are looking to replace the complete assembly, likely you will need a basin wrench to reach nut (65157).
Here are links to Kohler, specific to this tub.
https://www.us.kohler.com/us/catalog/svg_viewer.jsp?productId=415928&diagram=3 https://www.us.kohler.com/webassets/kpna/catalog/pdf/en/1010564_5.pdf

When the air button stays in the down position it can be because of a couple of things.

• The air bellow is broken and there is no air in it or the spring is broken and will not push the button back up and needs to be replaced.
• There is calcium built up on the inside of the air button so that the tolerance is too large and therefor makes the button 'stick'

To solve the second issue with calcium build up. Take some emery cloth and wipe the inside of the button until it is smooth.
You should be able to get the button back up gently with a small wire placed between the button and the wall of the air button body.

Rod
US Parts Center
888-521-6183

The chances that is problem you are experiencing is related to the suction cover is extremely remote. The suction assembly doesn't have anything to do with the tub motor operating.
The issue is most likely with the motor not working or the air switch in the motor malfunctioning.
What does the control look like that you use to turn the pump on/off?
Is it an air button or an electronic switch?

There are Air Switches (at the motor or control box) and Air buttons (on the spa/bath side). The vinyl tube between them is the only other component to the 'switching' on/off a hole in the tube may cause this problem.
The air switch has a diaphragm which is activated by the air in the tube when the button is pressed. If the air pressure is not sufficient the switch will not operate.
As you've replaced your Air button, you might want to change the tubing and either adjust the Air Switch or replace it. The switch only needs 1-5psi to activate so the pressure from you blowing into the tube can damage the diaphragm in the switch.

Check for an air switch at your local hot tub store

take the old one in so they can match it up to a new one

Most Kohler tubs have a water sensor or water level sensor. Is this an air bath tub (holes in the floor)? or a jetted tub? If it is an air bath, the tub will purge after using it 15 to 30 minutes ater it is drained. If it is programable it will come on every 24 hours if it has been programmed. If it is a jetted tub, there may have been water on the sensor and caused it to start up. If it is a single on/off button the switch could have gotten water and caused it to start up, or there is a problem with the control box. It usually will not start a fire if it comes on, most of the newer pumps have run dry seals. If you leave the house for vacation or weekends, I would advise unplugging the tub or turning off the breaker.

Kohler Whirlpool tub turns on and shuts right off. Reset gfi and motor turns on and shuts right off. Help

Sounds as if you may need a new switch to turn the tub on/off. You can find one on our site www.uspartscenter.com

Here is the manual for the tub. The switch is an air switch with tube. You have to make sure the tube has no holes in it or replace it if you can. look on the manual it will help you out.
http://www.us.kohler.com/onlinecatalog/pdf/1010564_5.pdf

This is a problem common to all whirlpool/air jet style tubs. The pumps become air locked due to the water evaporating from lack of use. All tubs need, and have, SOME means of priming the pump, this is most likely what the problem was, originally, for you. This time in particular you found it to be electrical in nature but for future reference, for you and all who have these style of tubs, I am putting this out there. Some where on the tub, usually along the top edge of the tub is a vent knob that controls the amount of air that the pump is allowed to mix with the water for the jets, usually by closing this valve all the way (tub needs to be full of water of course) and running the pump for a minute or 2, you should be able to get the pump pumping water again, if not you may need to do something else with your particular set-up to get it purged of air, the pumps in jacuzzi tubs are designed to pump water, not air, so if the motor is running but you get no jet action, your most likely air locked and need to prime pump/purge air.