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Dodge Ram Knowledge Base Here you can find owner submitted how-to's for performing various mods to your Dodge Ram!


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  #91  
Old 05-23-2012, 09:33 PM
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Okay , so I've done this mod TWICE today so far .Used the Duralast stat #4128 the first time and got it back together and refilled with coolant . Took it out for a test drive to get it heated up . Had the EVIC on so I could watch the temp went to 210 and still didn't open . Figured I got a bad stat , went to Napa and had them cross the duralast number and got a NAPA part THM-165 says its a 180degree on the box . Replaced and refilled again . Took it out for a ride and same thing 213 and no drop . What the hell , any ideas ? Didn't remove the mechanical fan or reset the electric fan . constantly ran about 203 with factory stat .
More than likely the tstat's are fine and you are just not purging the air out of the cooling system.

First of all, the thermostat should have the temperature stamped/engraved on it somewhere.

After you reinstall and fill the coolant with a 50/50 mix of water/antifreeze(too much antifreeze WILL cause overheating, since it doesn't cool as well as water), start the truck leaving the radiator cap off, and put the heater on(floor vent, fan motor on, turned to hot). Run the truck all the way to operating temperature, it may take a while idling. Also, squeeze the radiator hoses repeatedly to "burp" the air out. Add coolant as needed to maintain a full radiator.

You then can put the radiator cap back on and drive it a little. You will need to check and top off the coolant level for the next few heat cycles...
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  #92  
Old 05-24-2012, 02:11 AM
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Seems to be working fine now . Turns out I'm a dumbass . My My last truck was a ford and had a sealed system . So I never even tried to take the cap off the Ram , I just filled the catch jug like on the ford . Once I got the cap off and topped it off , its doing what its susposed to do . We just back from town , I ran @ 50 mph in second , trying to heat her up and she went to 176 and stayed there .Thanks snrusnak
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  #93  
Old 05-24-2012, 02:14 AM
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Do you have to drill the tstat? Another forum has people saying something about drilling a small hole
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  #94  
Old 05-24-2012, 08:38 AM
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Glad that was all it was

Garner, what exactly are they saying to do? You shouldn't need to drill a hole in the tstat. The 4.7L tstat has a hole w/ a check valve type thing built in to it, but the hemi doesn't use that design. You can drill a hole in the tstat, but this effects how it operates as there will always be some coolant flow. Whether it's good or bad is up to you. I wouldn't do it on my new ram, but I did do it on my old s10 as I wanted a cooler tstat but the 180 tstat in that truck ran too cold so I drilled 3 small 1/8" holes in the stock 195 tstat to allow the tsat to bleed. This was my solution to achieve a operating temp somewhere between stock and the 180.
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  #95  
Old 05-24-2012, 10:49 AM
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im doing this mod this weekend!
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  #96  
Old 05-24-2012, 03:42 PM
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I've seen the suggestion of drilling the stat on this forum . There was a dicussion about those changing to the 180 stat in extreme cold climates and the 180 being to cool or something to that effect . Someone suggested drilling the stock stat as snrusnak mentioned above .

Update topped mine off again this morning , went for a drive still running @ 176
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  #97  
Old 05-24-2012, 03:54 PM
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^Drilling the tstat will make the engine run cooler, not hotter.

EDIT: Ignore my comment, I didn't see that you said "stock" tstat...
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  #98  
Old 05-24-2012, 06:21 PM
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1/16 hole on the outer rim for it to be able to bleed. 4.7 only thing maybe?
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  #99  
Old 05-24-2012, 09:30 PM
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yeah the 4.7L tstat is designed that way, I'm nearly positive the hemi one isn't.
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  #100  
Old 05-24-2012, 09:31 PM
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My stock thermostat had a small hole in it. In fact, as I was removing it coolant was flowing out in a small stream. The hole will help get the air out too though.
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