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Filling Cooling System
To fill the cooling system, remove the fill cap and fill the tank to the top. Replace the cap and run the engine at medium speed for approximately one minute. Remove the cap and recheck the coolant level. (H-2, p115)
Draining Cooling System
To completely drain the cooling system it is. necessary to open the drain in the bottom of the radiator and also a drain on the right side of the cylinder block. Remove the radiator cap to break any vacuum that may have developed. Should the cooling solution be lost from the system and the engine become overheated do not refill the system immediately but allow the engine to cool or refill slowly while the engine is running. If cold solution is poured into the radiator while the engine is overheated there is danger of cracking the cylinder block and head. (H-3, p 115)
An engine will not be damaged by high coolant temperatures unless the coolant boils. (H-15A, p 118)
* Excerpt from the Service Manual for Universal Jeep Vehicles page 115, 118