how do you know if its cloged and how would i clean it

 

Symptoms are mainly a poor idle. If you step on the brakes and the idle drops, or the idle drops under heavy electrical load or when the A/C is turned on, then the BAC might not be doing it's job. These symptoms can also be caused by other problems.

Cleaning is easy. Remove the valve, and then use carb cleaner to dissolve all the nasties inside.