I hate when that happens. The brand new radiator came with a brand new POS rubber cap for the throttle return nipple which has cracked enough to leak my MotorCraft coolant out, to the point that what's left is boiling. I barely noticed it after leaving the truck idling for a while. Fortunately, I expected it, and I have a JY replacement cap stored on the tip of a bolt nearby, so it only took a few minutes to fix.

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Owner caption July 2016 · Photo 0 of 5000