i have only high beem no low beem
If the bulb is a hi/low with both in same bulb then it is possible that the low beams have went out or the switch is bad and will not go from hi to low , of course could check fuses too.
Search Chevrolet Cavalier Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Chevrolet Cavalier Experts