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I can't find a drain petcock on the radiator for my 2002 4 cylinder 5 speed Frontier. Am I not seeing it? If there isn't one, do you know the best way to drain the coolant? I have 38k on the truck and would like to put in a fresh mix of Prestone and distilled water before the snow flies. I tried another Nissan forum site and nobody replied. Thought I'd try this one. Thanks!
 

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I don't know, for sure, about the 4 cyl. models, but my v6 Fronty has a flush, plastic, phillips head screw for the drain plug. You have to unsnap the rubber insulator under the radiator and look for the phillips head. Off center to the driver's side. Hope this helps.
 

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The drain **** is on the drivers side bottom of the radiator on my 2001 4-cyl. It is under a flap of rubber that needs to be unpinned and pulled back.
 
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