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what's the best way to do this? i've heard to remove the radiator cap, turn the heater on, and let my truck idle till the thermostat opens. is this right? also wont this cause antifreeze to go everywhere?
 

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instead of removing it completely, unscrew it 1/4 turn (to where it's on, but not tight) to prevent it from building pressure. The overflow tank should catch whatever comes out.
 
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