Pvc not properly put together or was not glued, Turn off main water supply cut out leaking area replace and put back together. Make sure you measure PVC so that you will purchase correct size.
No, it will not cause oil leaks.
Only if you have leaks or problems.
You don't fix it, you replace it.
duct tape
No , the glue will not apply smoothly and will not make a lasting joint.
Brake it down
You will not be able to fix air conditioner leaks by yourself. You will need to find and call a qualified technician. Use your local yellowpages book or yellowpages.com
How To Find & Fix Coolant Leaks http://www.aa1car.com/library/coolant_leaks.htm
use Jose ortiz
Dig it up.
pvc flange if glued properly can not be detached you just need to cut it and fix up a new one if the old flange is useless. www.pvcpipe.in
Don't try to fix a constant velocity joint, better off just replacing it with a new or reconditioned one.