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DDurango5.9L

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Discussion starter · #1 ·
I changed my Thermostat in the winter time to a FailSafe 192° one. Now I notice when my truck is standing still with the A/C on, the needle goes up a hair pass the half mark. I wanna keep it cool. I was told to go down to a 160° Thermostat. Will that Help?? :? It's a 98 Durango, 5.9L, 4x4
 
IMHO a 160 will be too cold?

180-185 will work fine.

if this is a 98 or 99, the thermostat won't make much difference (unless it's defective or mis-installed)? these are known to be marginally cooled? make sure your cooling is system clean (should be flushed every 30k miles) and your fan clutch is working properly?

?tom
 
It "can" help to a degree (no punn intended.) The thermostat is your "temperature regulator." It opens and allows coolant to flow through the radiator. So if you have a cooler T-stat, it'll open at a cooler temperature and start circulating coolant into the radiator sooner than a hotter one. If the radiator's able to extract that extra heat, then the engine and coolant will run at a lower temperature. Once the radiator can't get rid of the extra heat, you've exceeded the capacity of your cooling system and the thermostat isn't going to make any difference.

Therefore, the T-stat is just one of a few variables that determine what temperature your engine's going to run at. The two other major parts (if everything is working properly) are the radiator and the outside air conditions. Hope that helps.

aloha,
g
 
Discussion starter · #4 ·
thermostat

Okay, I changed my thermostat to a 82° one and now my temp is very low. Not sure if this is normal but I took a pic so everyone can see its almost at 130. Also my oil gauge is over 40! It usually only goes to 40 when the truck's standing still. I took a picture of that as well.
 

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What Tstat did you put in?? You said 82° and that's strange cause that temp is way too low! You're gonna throw a check engine code.
Steve
DOC Pres
 
82°C -> 180°F

That gauge reading does look a little low. Can you borrow an OBD-II reader and see what the PCM thinks the coolant temp is?

If you engine's cooler, your oil pressure will probably be higher (the oil is thicker)
 
Also, if the operating temp is too low, the PCM richens up the a/f ratio to help warm up the engine and your fuel mileage will drop. If it goes too low for too long, it'll throw a code and a trouble light.
 
For a 180°, that looks correct as that's what mine reads on a nice 75° day or colder. Above that, and it starts creeping up towards the 210° mark. Oil pressure looks good as well and I think you're fine. On cold days, it may take a little longer to get to the 180° mark but, even when it's been as low as 0°F here in MD, I've never gotten a code for it taking too long to warm up to operating temp.
 
tomk said:
82?C -> 180?F
OIC. I would have never made the connection. I'd expect that from our Canada pals and others, but from New Jersey?!

Never learned much celcius or metric for that matter. Remember when it was a Fed regualtion to have speed signs, etc on highways changed over to the Metric/Km system and only like three states complied with dual signage. We still have Km on the speedos because of that (in the 70s I believe, around the same time they dropped the speed limit down to 55 on highways built for 80 decades earlier.)

IndyD
 
having spent a lot of time helping my daughter with her freshman Physics classes this past year, I've been re-sensitized to units :?

?tom
 
Indy that was my thought. Oh well, I guess Belleville is different. J/K LOL
Tom, How's that Scion doing?
Any mods yet?
Steve
DOC Pres
 
So far the only Scion mod has been cruise control? I think the DOC sticker is next.

So many things to do, so little time?

Driving to work and back she's getting about 35mpg :shock:
 
I also think it looks fine. I have a 180 thermostat in my 5.9 and that's where it sits. I just got my radiator flushed yesterday and am going to add water wetter to it?
 
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