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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
It has to be done because when you pull the intake off, there is coolant passages in the cylinder heads and it will leak coolant into the lifter valley.
Because the thermostat mounts into the front top of the intake manifold. Coolant flows through the manifold so you must drain it before removing the manifold, otherwise all of that coolant will go into your engine oil.
If you don't remove the fan then prepare for a very sore back. You can do it without removing the fan it's just a lot harder. If you remove the fan you can actually stand infront of the engine and work. Tons easier on your back.
you will have to strip down the top part of the motor which includes the accessories.. a/c ps, alt etc... get those out of the way and you should be good to go. yanking off the fan & shroud makes it so you can stand in the engine compartment when working on it. much easier to work on for the 10~15 min to take the fan & shroud off.