If you feel comfortable doing it then yes, go ahead. This may take care of the problem or you may find the actual problem while doing it. At the very least you will eliminate one possibility from the list. Sounds like the pump may be old anyway if you suspect it so go for it.
This is a potentially dangerous repair. Do not attempt this yourself. This should only be done by a qualified tech.
Not necessarily, unless you think they are leaking.
upholstry or body shop. dont attempt it yourself.
If a transmission is leaking fluid, it is likely that a seal or gasket has failed. Replace the gaskets and seals and the leaking should stop.
You should replace the water pump on a 1999 Toyota Avalon when it becomes worn out. You can also replace it when it begins leaking.
If leaking from the rail itself, the rail will need replaced. If leaking from a seal at the rail, replace the rail.
Yes, they cannot or should not ever be repaired=Have a licensed INSURED plumber Replace it=
remove and replace defective components
True
Discard and replace it- do not attempt to fix it
I would say if it's warm weather fill the rad with water and see if you can find were it is leaking. If it is a hose try to replace it yourself. If the rad is leaking see if it is just the drain plug open. If not try replacing the rad yourself. If at all possible do not use that stop leak stuff as it will also clog up your rad.
Replace Heater Core