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Discussion Starter · #1 ·
So the other day I posted about how I'm having problems with the car after installing a 180° thermostat and setting the fans to kick on around 190 to 195 it can't seem to stay below 208 when idling..

Even on the highway it goes down to 197 and that's it..

I did figure out that when I turn on the heat inside the car it keeps it at a steady temperature that I wanted to do that. So apparently when the fans are blowing over the heater core for the interior that keeps it cool but the radiator fan on high doesn't seem to do it..

Some people suggested air bubbles but does that sound like that?

I can't figure out what could be. I checked the fans they're working. The coolant seems to be flowing because when I take the cap off it steems

But unless I'm running the heat it doesn't seem to go below 203 tops. Usually it fluctuates between 203 and 208 despite the fans being on high the whole time..
 

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It wouldn’t hurt to purge the coolant system. Every time you take the cap off you risk getting more air in the system. Air in the system can cause steam and act like a plug and prevent the coolant to cycle correctly or even at all. It’s a little bit of money but what’s $100 for piece of mind one less thing to worry about and maybe check that the coolant isn’t milky or dirty indicating other issues.
 

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Discussion Starter · #3 ·
It wouldn’t hurt to purge the coolant system. Every time you take the cap off you risk getting more air in the system. Air in the system can cause steam and act like a plug and prevent the coolant to cycle correctly or even at all. It’s a little bit of money but what’s $100 for piece of mind one less thing to worry about and maybe check that the coolant isn’t milky or dirty indicating other issues.
Yea im just looking at otger options because the coolant seems to be running

And it never overheats beyond 208 so thats weird
 

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You should post the year and engine size and milage when asking for assistence
And location and outdoor temps. There is nothing wrong with 208 210 at idle. Different days and times of day will show different temps.

On my 2013 R/T 5.7 dual fans when I idle in 95°F heat my fans cycle on high at 197 and back to low at 186. I have the Severe II thick radiator and dual fans.

You are not overheating until 225. I would not be worried with what you are running. What car and engine are you running.. What weather temps.
 

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You should post the year and engine size and milage when asking for assistence
And location and outdoor temps. There is nothing wrong with 208 210 at idle. Different days and times of day will show different temps.

On my 2013 R/T 5.7 dual fans when I idle in 95°F heat my fans cycle on high at 197 and back to low at 186. I have the Severe II thick radiator and dual fans.

You are not overheating until 225. I would not be worried with what you are running. What car and engine are you running.. What weather temps.
It's a 2006 Chrysler 300 Limited with a 3.5.
 

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Discussion Starter · #6 ·
You should post the year and engine size and milage when asking for assistence
And location and outdoor temps. There is nothing wrong with 208 210 at idle. Different days and times of day will show different temps.

On my 2013 R/T 5.7 dual fans when I idle in 95°F heat my fans cycle on high at 197 and back to low at 186. I have the Severe II thick radiator and dual fans.

You are not overheating until 225. I would not be worried with what you are running. What car and engine are you running.. What weather temps.
So are you saying that even when your fan cycle on high at 197 it still goes up to 208?

Cuz that's what's happening. It might be a warm day but even driving on the highway it only goes down to like 197 at the lowest.

This is a problem because it's DIFFERENT from the previous before I changed out the thermostat.

Before the change out it would easily be able to keep itself down in the 200 range or the 197 range depending on how I set the fans. Even idling. And on the highway it would go down to 192. I think the thermostat was a 190°

But then after changing it to a 180° thermostat it cannot get itself below 197 no matter what. I don't think it should have to be a 40 day for it to be able to handle going down to the temperatures the thermostat was set for and that the fans were set for

And I have no reason to believe that the outside temperature would affect it because it didn't seem to affect it previously and no matter how much the fans go it never seemed to change.

So you have a temperature was probably in the 85 range and it's a v6. I don't see why it should possibly have trouble getting below 200° even idling..

Because it's really not about whether it's overheating or not it's that shouldn't be at that temperature. And the hotter the engine gets the more it affects the AC.. clearly there's something wrong because it changed after the work was done. I'm trying to figure out what is wrong and what could possibly be the problem.

Because it doesn't make sense that the engine would run hotter after you get a lower temperature thermostat versus when it had a higher temperature thermostat beforehand
 

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Discussion Starter · #7 ·
It wouldn’t hurt to purge the coolant system. Every time you take the cap off you risk getting more air in the system. Air in the system can cause steam and act like a plug and prevent the coolant to cycle correctly or even at all. It’s a little bit of money but what’s $100 for piece of mind one less thing to worry about and maybe check that the coolant isn’t milky or dirty indicating other issues.
Ok. Other posts in the forum suggested taking the cap off to potentially get an air bubbles out so I wasn't sure. Is it possible that it could just be bad coolant? I mean they put in fresh coolant but it was green and I usually use the orange but it just doesn't make sense that the coolant would make that much of a difference unless there was something else wrong
 

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Is the weep hole on the t-stat at 12 o'clock?
That's how it keeps air bubbles out of the system.
Is your resorvoir cap sealing properly?
Seems like all your troubles began with altering factory settings with the tuner...
 

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Is it possible that it could just be bad coolant? I mean they put in fresh coolant but it was green and I usually use the orange but it just doesn't make sense that the coolant would make that much of a difference unless there was something else wrong
The short version is that you have the wrong coolant in there, and yes, it could be causing your problem.

Your car calls for HOAT coolant, not "orange" coolant. While the factory fill would have been orange in color, Chrysler HOAT purchased as a service part is pink. The orange coolant you've used may have been Dex-Cool, which should more accurately be called Death-Cool when used in a Chrysler. It is an OAT formulation, and usually reacts with HOAT by turning into sludge which can clog your cooling system.

To make matters worse, it sounds like old-school bright green IAT was added to the mix. With that witches' brew in there, I'm surprised that the cooling system does anything at all.

I know that you love to argue and "answer shop", and that you would rather start multiple new threads for the same issue than do your own research or, God forbid, swing a wrench, but you need to flush your cooling system thoroughly and refill with a 50/50 mix of HOAT coolant and distilled water if you want to resolve this issue.
 

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Sure they put in the correct thermostat? Did it get tested in a pot with a thermometer to see when it opened?

If they mixed your antifreeze it will possibly corrode & gel the system. You're gonna need to have it flushed & refilled. If they didn't know you can't mix different antifreezes together I would not carry anything back to them.
 

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I agree with other comments about wrong/mix of antifreeze. I'd buy a gallon of correct concentrate from Mopar dealer, and pickup several jugs of distilled water, do a complete flush, then mix concentrate with distilled. Also, as mentioned, check the orientation of the weep hole at the 12 o'clock position in the housing, and while you're at it, pull the stat and get a thermometer and still the stat in a pot of hot water to check to see it opens around 180-185. I changed my stat to a 180 on my Hemi at less than a year old, and along with a Diablo tune and fan setting changes, had good luck for a few years. Then, on way home on highway on a 95 deg. day, stat stuck SHUT completely! Coasted to off ramp and shut down as it just passed 230. Had it flatbacked home, where I got a new 180 stat and put it in. Was also running sometimes abnormally hot, or would spike, then cool. Re-purged for any air pockets a couple times, but still the same. Long story short, I went through a few 180s in a couple years, including another that stuck completely shut. Made in various places, including US, Mexico, Israel & China. All were POS. Went to a 190, which was built better, and never had a problem for past 5+ years. Only time I can get mine over 206-208 range is on a 90+ day, and romping on it pretty hard at highway speeds, but even after I come to a stop after a few minutes, always stays in the 197-198 range. Cooler days at steady speeds, runs 192-194 all day long.
 
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