jimmy problems

Hey im 16 and I got my 97' gmc jimmy awhile back , and lately ive been hearing air coming from my passenger door and it can be very annoying at times . any help on getting it fixed would be great thanks !!

I have a 2000 GMC Jimmy SLE... 1) When my car is driving in 2wd every so often it will start whining by the passenger front wheel. When I switch it to 4wd HI then back to 2wd it is fine for awhile. After doing some research, I think it is the transfer case vacuum switch. Only problem is I...