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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