180 thermostat install

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Jeff CA

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My friend helped me install a 180 thermo today. A couple of surprises to be on the lookout for. The water neck had paint overspray in it from the factory. It was starting to flake off and get particles in the cooling system. Fortunately, my truck doesn't have many miles on it, and we caught it early. We used sandpaper to get all the loose stuff off.

My friend came up with a good trick to allow the coolant to rise and burp after you start the engine when you're done and are letting the engine warm up. He cut the bottom off a 1 gal milk carton, wrapped electrical tape a couple of times around the mouth of the jug to expand its outside diameter a little. The mouth fit snugly into the top of the radiator and not one drop of coolant leaked! The contraption allowed the coolant to expand and burp then sink back down into the radiator. Tip: squeeze the radiator hose several times with your fingers to expedite the burping process.

Another tip is that coolant goes everywhere when you yank the hose and again when you pull the original thermo, so plan accordingly! And this was after we let some coolant out before we started.

Another shocking find from the factory was that the radiator hose was only on the water neck just enough for the clamp to clamp onto it. The hose was not bottomed out on the stop as far as it could've gone. When we re-assembled, we seated it all the way down the neck to its stop.

I also added RP Purple Ice. Using the EVIC, steady state temps are in the 18x range. More power from the cooler heads now? ;)
 

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audio1der

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Mine feels more like a truck in the cool, early morning, EVERY TIME I drive it. Very glad I wasn't scared off my MPG worries on this mod; we haven't lost any mileage at all, just degrees.
 

QwikKota

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That milk jug is a great idea. I hate wasting expensive coolant or making a mess. How much coolant had to be added? I think the T-stat is on top of the engine luckily unlike my 4.7L Dakota. You lose it all changing it out.
 

R/T_Fire

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Does this mess with the anything in the ECM if your bone stock?
 

Jmhm17

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Stock? No. no codes - nothing. Actually the dealership dosnt even notice it.

I will say I got spooked when I did mine on my first truck that all the coolant came gushing out of the block. I expected it to come out of the hose but not like it did when I poped the tstat out.. I think total I lost just about a gallon. Buy a gallon of premix make sure you note the color of the coolant cause theres 2 kinds and they will ask you which one it is. DONT JUST GO BY THE YEAR OF YOUR TRUCK - look at the color.

And as always make sure you hose everything off real good when your done cause coolant can cause isues on some metals and rubber (i think)

Oh and one more thing.. the coolant smell wil wear off in a few days lol
 

BlownGP

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You will get a code in cold climates, because the truck whats to know why it's not getting up to operating temp as fast.

I get a light every winter, don't care. Sometimes it will go off by itself it stays warm for a while...

I love the 180 tstat mod. Done it on all my cars.
 

Jmhm17

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-10f never got a code. hope my new truck dosnt do that. but then again i got an AZ one and it read 185
 

MANual_puller

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Are 4th gen still using a 63mm thermostat? I did the 180 stat on my '06 and have an '11 now that "needs" done :naughty:
 

Jmhm17

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on my SRT4 I had a 160 tstat and if it was under 45* outside it would throw a code.

I Kind of liked that my AZ tstat was 185 and not 180 i feel like that 5* is what kept the light out. but Ill let you know how the new one goes. I havnt installed it in my new truck yet. Its an Autozone one but who knows what temp it will actually give me.

Throwing a code for a tstat is not good tho as it throws timing and messes with your tune. "not good" as in it will lessen your power slightly, not blow your motor.
 

BlownGP

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on my SRT4 I had a 160 tstat and if it was under 45* outside it would throw a code.

Throwing a code for a tstat is not good tho as it throws timing and messes with your tune. "not good" as in it will lessen your power slightly, not blow your motor.

Must be a 09 thing.

But the P0128 code for the t stat has nothing to do with your tune or messing with your timing. You are thinking of the air intake temperature.

Even if that was a problem, the computer can compensate for it, so really doubt you could blow your motor.
 

R/T_Fire

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I have a feeling I have nothing to worry about with this nice warm Cali weather :roflsquared: Ive always ran low temp T-stats in my old muscle cars but never put them in the late models, always figured it would mess with the computer. only one I ever did it to was my pre-runner ranger but I also did alot of other little tricks to that bypassing and rerouting coolant lines and adding resistors and such into the sensors....
 

SIhemi

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I did this on my 09 and I've never had a code in the winter. I don't know if they compensate this in a custom tune.
 

BlownGP

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I did this on my 09 and I've never had a code in the winter. I don't know if they compensate this in a custom tune.

Unless they can delete the code, then that could be how.

I have a intune canned tune and it still does. Done it for two winters so far. Again, I really don't care. It goes once it warms back up.
 

Irongoats

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Since I'm a Ram newbie when it comes to their trucks do they run hotter than normal? Why the swap if it's not necessary or is it necessary? School me on this please. Thanks.
 

R/T_Fire

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Since I'm a Ram newbie when it comes to their trucks do they run hotter than normal? Why the swap if it's not necessary or is it necessary? School me on this please. Thanks.

Most late model vehicles run at a hotter temp for emissions. Running them cooler helps cyl temps to be cooler which I would say promotes better/ cooler air/fuel atomization which increases performance and efficiency.

Here is a explanation, although its not accredited it still gives the general idea.

How can a cooler thermostat increase horsepower
 
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BlownGP

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Since I'm a Ram newbie when it comes to their trucks do they run hotter than normal? Why the swap if it's not necessary or is it necessary? School me on this please. Thanks.

What R/T said pretty much.

You're not going to be gaining like 500HP with a T-stat swap, but a cooler engine to me is always better. Especially living here in the south.
 

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