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Discussion Starter · #1 ·
I have what looks like a fairly new water pump off my 3.9 V6 core engine. I have looked at the pump and it appears the pump pulls coolant from the rad and the by pass just next to the thermostat and outlet. If someone can explain or has a link to a good article share. Steve
 

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Discussion Starter · #3 ·
I'll be sure to be on the look out for one Ralph. Thanks for the link it confirms what I was thinking. I kind of wonder what percentage of uncooled water circulates once the thermostat opens. Clearly the system works and I'd think a fresh cooling system works really well. Steve
 

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Discussion Starter · #6 ·
Having purchased my complete cooling system maybe a year ago I have unpacked the parts as required. Having a little work bench space I opened the radiator box. To my surprise it's a 1.5 inch thick unit. The one I removed ( and still weeps mud on the floor ) is a 1 inch thick. I opened the electric fan which is 15 inches and bolts to the radiator 1/2 inch from matrix. The other half of the AC system bolts to the other side of the radiator. In the two and a half years I have owned the truck the electric fan has not worked. I have been told the fan clutch does not or did not work correctly. Having installed a new water pump, fan clutch and all cooling system parts I feel many of my running issues will be resolved.

It has been mentioned several times that the engine driven cooling fan can be removed reducing power loss. If I get several dyno pulls I may remove the clutch fan to see. Steve
 

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Discussion Starter · #7 ·
Due to bad weather and other issues I have yet to drive my truck with rebuilt power unit. Making sure everything under the hood was in order before replacing said hood. I went around and added 1/4 turn to all water hose clamps after break in run. I use only SS hose clamps that don't have the threads cut though. I mentioned the big electric fan bolts right up against the radiator, as mentioned it alone should do a great job. The mechanical fan on the other hand is about as far from the radiator as possible. While I did not measure it looks like a foot. Considering the only parts reused on my project were the engine block, crankshaft, intake manifold, timing cover, valve covers and fan shroud. I feel there is a good chance any cooling issues I had are a thing of the past. Steve
 
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