Where to buy a Kohler air switch and air button?

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?

The problem you are experiencing tells me that the air switch in the motor most likely the problem.
This is a latching air switch that operates when the button on the side of the tub is pushed.
The replacement TBS-339 air switch is around $21

Rod
US Parts Center

yes. that clear hose goes onto the air switch on the back of the motor. once that is hooked up if you push the air button then the pump should turn on/off for you.

What you need is a new air switch for the back of the motor. The air tubing connects to it on the motor. that is probably what is clicking when you push the air button on the top of the tub. Once you change that air switch you will be back in HOT WATER !!
Should be a TBS-310 or TBS-301 latching air switch is the one you need. Either of those models will work in a Kohler pump.

First, disconnect the air hosing from the back of the pump. Reconnect a new vinyl hose to the back of the pump, and blow into the other end. If your pump turns on/off by doing this, see 'A," if not, see "B."

A. The electronic switch in the pump is good, and there is a problem with the air switch or vinyl tubing. The vinyl tubing could be kinked or the air bellows has failed.

B. The electronic switch in the pump is bad, the capacitor is bad, or some other electronic part of the pump is bad. Buying a capacitor or an electronic switch is of course a cheaper fix than to replace the entire pump.

Hope that helps.
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first check the air switch hose that connects to the "button"
Open the access for the pump there should be 1/4" poly tubing (probably clear) that connects to the pump motor. It just slides over a barbed nipple usually located somewhere on the back of the pump housing opposite the pipe connections. Make sure it is in place properly. If it is in place then look else where. The tubing also connects to the back of the air switch "button". This button connection rarely fails, especially if the tub was working and now does not. But if the tub is newly installed and may have disconnected during installation. this connection is probably going to be difficult if not impossible to verify since it is usually concealed after installation.
Some pump motors have resets some do not. If it does it probably is on the very back of pump opposite the pipe connections.
Also check to make sure that any electrical outlets in the bathroom, or any where in a nearby radius of the tub, to see if they have "GFI" reset buttons and make sure that they havn't tripped by pushing in the button between the plug-ins named "reset". Usually the circuit for the pump will be tied into one of these switches to add ground fault protection to the circuit.
If your pump is not working after checking these things it may be dead. Does your pump "hum" after pushing the button? Do you smell any type oder around the pump that would suggest a "burnt motor"?
If the pump is dead you will have to replace it.
Come back here and post more if your problem isn't solved. Or ask how to find and replace a new Whirlpool pump.
Hope you figure it out. T. Wood CFE Plumbing

The button is likely an "air switch" which uses a push button to send a puff of air down a tube to activate the switch at the other end. Since 99.9% of jetted tub makers no longer can use an electrical switch mounted at the surface of the tub, due to the possibility of contact with water (shock hazard).

The best way to clear the tube of any water is to remove the access panel (if you have one) on the tub, otherwise, you'll have to gain access from an adjoining room via a wall, etc. You can try to suction the wate from the tube, if you can remove the push button from the tub. I would try using a turkey baster or eye dropper to extract the water from the tube, but as I stated, the best way is to gain access to the inside of the tub components and remove the switch tube that way. It is possible that the push bulb switch has become disconnected from the actual switch mechanism and you'll need to reattach it anyway.

Check your owners manual to see where the switch is located, in case you need to get at the controls via cutting through an adjoining wall. This is why the manufacturer's all say these types of tubs should always be installed to allow access to the inside components for servicing, in case repairs are needed. Just an FYI, it is easier to repair and replace a small piece of drywall 16" by 16" than to have to repair tile work, etc. Of course, it all depends on what you're good at!

You might also want to contact Kohler to talk with one of their customer service people and see what they recommend you try. 1-800-456-4537

Hope you find this helpful and best regards!

If the air tube is still connected to the air button on the side of the tub and you are pushing it with no results then either the motor is no good, the air button is no good or the air switch in the box is no good.
process of elimination, start with the pump. take the switch off the motor or out of the box and make sure you can get the motor to come on. If the motor comes on then move to the air switch and hook it back up and see if you can blow into the air switch with a new air button or a straw and see if the switch will activate the pump. if it does then you most likely have a bad air button ($12). If you cannot get it to activate the pump then the air switch is bad ($21).

you need to see if there is power to the pump 1st, there may be a switch somewhere thats not been switched on or it may have tripped out so check that. the air pressure switch maybe faulty or the plastic hose may have even come away from the switch.think of the basics 1st then look deeper, if you have power at the pump then it can only be the switch or worse case scenario a new pump.
you might have to remove the bath panel to gain access to the pump better?

kindly

Richie