Jeff Smith, there is plenty of information about that [http://on here.] :" Pacifica Coolant
STANDARD PROCEDURE - COOLING SYSTEM DRAINING
WARNING: DO NOT REMOVE OR LOOSEN THE COOLANT PRESSURE CAP, CYLINDER BLOCK DRAIN PLUGS, OR THE DRAINCOCK WHEN THE SYSTEM IS HOT AND UNDER PRESSURE BECAUSE SERIOUS BURNS FROM THE COOLANT CAN OCCUR.
(1) Without removing pressure cap and with system not under pressure, open the draincock. The draincock is located on the lower left side of radiator (Fig. 3).
(2) After the coolant pressure container is empty, then remove coolant pressure cap.
(3) Remove the cylinder block drain plug(s). These are really not for the routine maintenance, but would drain coolant much faster from the block. You might accomplish the same by removing your thermostat and let the block drain that way
STANDARD PROCEDURE - COOLING SYSTEM FILLING
Remove pressure cap and fill system, using a 50/50 mix of Mopart Antifreeze/Cool
Continue filling system until full. Be careful not to spill coolant on drive belts or the generator. For cooling system capacity, (Refer to LUBRICATION & MAINTENANCE/FLU
Fill coolant pressure container to at least the MAX mark with 50/50 solution. It may be necessary to add coolant to the coolant pressure container after three or four warm up/cool down cycles to maintain coolant level between the MAX and MIN mark. This will allow trapped air to be removed from the system.
STANDARD PROCEDURE - ADDING ADDITIONAL COOLANT
The radiator cap should not be removed.
When additional coolant is needed to maintain this level, it should be added to the coolant recovery/reserv
CAUTION: Do not use well water, or suspect water supply in cooling system. A 50/50 ethylene glycol and distilled water mix is recommended. For the recommended antifreeze/cool
STANDARD PROCEDURE - COOLANT LEVEL CHECK NOTE: Do not remove pressure cap for routine coolant level inspections.
The coolant reserve system provides a quick visual method for determining the coolant level without removing the radiator cap. With the engine cold and not running, simply observe the level of the
coolant in the coolant pressure container. The coolant level should be between the MIN and MAX marks."
Hope this helps, good luck.