It's a thermal vacuum switch which is usually part of the emission control system. If it's only got 1 hose (unusual) it must dump vacuum to one of the devices. Old car and not subject to emission testing? I wouldn't worry to much as long as the car drives OK.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Hyundai Forums
1.8M posts
409.9K members
Since 2004
Hyundai Forum is a community for all Hyundai Owners to talk and learn all about their favorite subject: Hyundai cars from the Sonata to the Elantra and even the new Kona!