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Old 02-08-2010, 05:38 PM
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Join Date: Nov 2009
Location: Johnson City, TN
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Vehicle: 2004 Dakota Club Cab 4X4
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Engine: 2002-2008 226ci (3.7L) Magnum/PowerTech V6 215hp 235lb/ft
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The 3.7/4.7 is notorious for trapping air in the cooling system and causing the problem you're describing. Try this - remove the bleeder plug on the water outlet for the upper hose and the radiator cap. Pinch off the upper hose with a pair of vise grips or something similar. Put a small funnel in the bleeder hole and fill with coolant until the system is full and then remove the pinch off and reinstall the plug. Finish topping off the system at the radiator, start it up and see what happens. This method isn't 100% guaranteed but it works most of the time. If you still have air trapped in the system you'll need to find someone with a vacuum venturi tool that can pull the air out of the system. One more thing, are you sure the poppet valve in the stat is pointing up?
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