How can I test TR aux air valves

Put the valve in the freezer f

Put the valve in the freezer for about 10 minutes. The vlave should open-up almost all the way. Once you have verified that it is open,you can leave the valve a room temp and it will start to close on it's own.

Most often they stick in the c

Most often they stick in the closed position, so I would assume if they are open now, that they are probably good. And you should know that they are bad, if the cold idle never comes back down. I have cleaned them in the past with a jet of carb cleaner. I checked my Bosch Automotive Handbook, and did a "Google" search, and cannot find any conclusive information if just adding 12 volts to the input is the proper way to test, but make complete sense to me...

Thanks Tom and Dave: The valv

Thanks Tom and Dave: The valves at room temp are slightly open. I would like to see if they close completely. I'll try some power to it and watch.

Jeff: I tested one of my valv

Jeff: I tested one of my valves. Place in oven at 200 degrees for 10 minutes. Take out, with a pair of gloves......make sure the hole is blocked. Then run cold water over one of the inlet/outlet tips, to cool off the tip. Then blow into this tip, and make sure the "seal" is good. Remember, just because it closes, doesn't insure that the "seal" is good! Follow by putting in freezer to make sure the passage becomes open.

I will follow with 12v applied, and again, make sure that the hole closes.

The biggest problem I have had

The biggest problem I have had with them (on other cars) is that they either stick closed, or never fully open when cold, so you either have no cold idle, or very low rpm cold idle.