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You pour it into the plastic bottle on the left side of the engine compartment.
The rear axle will hold about 2.5 quarts.
You most likely have a blown head gasket.
through the filler tube
You add it down the dipstick tube.
In the USA the only legal way is to contact the NHTSA and get a from that a doctor has to fill out. Then if it is all approved you can get a shut off switch.
First open up the radiator, then there's a drain plug on the bottom of the radiator. Fill with water and drain until clear. Fill it up and good to go.
Same place you check the fluid level.
drain and pull the old radiator out, slide the new one in and fill it up
18.7 liters in a radiator flush and fill in a 2004 Dodge Ram 1500.
Normally one entire bottle cat fill a radiator.
Dry fill is near 12 quarts.