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  #1  
Old 05-01-2010, 02:20 PM
B1500ram B1500ram is offline
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Default flushing 4.7 liter radiator help?

So yesterday i attempted to flush my coolant. I drained it from the radiator, then i tried to remove the block drain plugs and they were seized up pretty good, i stoped so as not to break them or strip. Then i said screw it, i removed the thermostat, connected the housing w/o stat, then flushed thru the rad. inlet. I then let all water drain until clear. Replaced thermostat and filled up with fluid. My system is suposed to be a 17 quart system, but i was only able to get about 9 quarts in. Heater gets warm, and the temp gage fluctuates slightly w/ increased speed it drops in temp and stoping increases, but does not go above the mid-line. Is there water still in the system from the flush? or air bubble, don't know? Dont want to screw it up. Thanks
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Old 05-04-2010, 07:23 AM
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you will see slight changes in the temp gauge as the thermostat cycles open and closed and the fan cycles on and off. if you are unsure -
remove the radiator cap and make sure the truck is topped off.
start the truck with the heater on full blast.
wait until the truck is at operating temperature and thermostat is open.
keep topping it off, give the upper hose a squeeze a few times to burp the air out.
put the cap back on and drive a little
let the truck cool completely and open radiator cap
make sure it's full and you are good to go
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Old 05-04-2010, 08:27 AM
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The 4.7 is notorious for trapping air. The best way I've found to get the air out without any special tools is to leave the cap off, remove the bleeder plug and fill the system through the bleeder plug. When coolant reaches cap level, replace the cap and continue to fill the system through the bleeder until full. Replace the bleeder and test drive with the heater on (to make sure it doesn't go cold, indicating air in the system) and watch the temp gauge.
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