Posted by andy r on December 04, 2013 at 15:54:20 from (75.91.149.15):
I drained and replaced the antifreeze on my farm pickup - a 2002 Dodge 1500 with a 4.7 this last weekend. I see there is a bleeder plug on top of the engine to release trapped air, but didn't know if it actually had to be used. I am familiar with bleeding the air on a Ford 3.8, but this 4.7 looks like it should bleed itself via the upper radiator hose. It did get hot after I added new antifreeze/water. I did check the thermostat in a pan of boiling water and it opens well. Took 15 miles to top out the temp gauge yesterday when the engine was cold and just started, but driving. I would let it cool down 10 - 15 minute, check the antifreeze level after I got the pressure off and go again. Seems like it only took 5 miles to overheat again after the engine was hot. Did that a couple times before I got home. Sure thought is was the thermostat but as I said it opens well in a pan of boiling water. Seems like it really didn't loose that much coolant each time if any. I don't run it while overheated as I know the 4.7 engine will start to pop out the valve seat inserts if they get hot - that is what an expert engine rebuilder told me. Any ideas????? Do you really have to release any air with the bleeder? Thanks
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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