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Pre-Teen Giggle Brigade
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4,672 Posts
the temp guage will only drop to nothing when truck is off. the more coolant u lose the hotter the engine gets as it runs cuz theres nothing flowing thru it to cool it down.
 

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Pre-Teen Giggle Brigade
Joined
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4,672 Posts
Buy a new cap...they are cheap enough.

We had 2 Dodge Ram trucks last year with bad caps....truck would sit and idle...then coolant would fill the overflow bottle and run out on floor...customer thought bad head gaskets.... I replaced the rad caps...problem solved.
dealer would have said it was headgaskets and done the cap and charger for the gaskets!
 
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