Drain the radiator. Disconnect the heater hose connections at the fire wall. loosen the dash screws and pull it out, just enough to reach the heater core. Unbolt the core and pull it out. Revers the process for installation.
A 1999 Dodge Caravan does not have a cabin filter.
Library
Have a look at this link: http://www.wikihow.com/Replace-a-Tail-Light-on-a-Dodge-Grand-Caravan
The heater on a 1999 Caravan doesn't have a heater valve. The temp is regulated with a blend air door that is controlled by the body computer and climate controll head.
It should be in the heater blower motor case which is located under the glovebox.
yes
A 1999 Dodge Ram does not have a water control valve.
You don't clean the oil filter you replace it.
Inside the oil pan
No
No.
It is over the passenger side strut tower, accessible from under the hood.