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 - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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