Hello my friends.
I Have Dodge Durango 2012 with 5.7 hemi engine. And have small problem with coolant temperature. Thermostat is new (203F) coolant pump and temp.sensor is new... When car stay, temperature grows to 225F, next cooling fan start, temperature decrease to 215 all the time the same. When A/C is on the temperature is a little lower but he is jumping all the time. When drive is all ok - 200F-207F.
2 years ago i had DODGE RAM 2011 5.7 and cooling temperature was always standing 203-205F.
Cylinder head gasket is new because he had exhaust gas in the cooling tank...
It was hard air evacuation but I think I did it right...
durango has an electric coolant pump?
what are your temperature behaviors?

 

Radiator clogged up? Either internal or external?

 

Hi, thanks for answer. I checked it. They are good. Water pump + Temp sensor t was replaced before my purchase. I buy this car with cylinder head gasket damage. Before Head gasket replacement temp was 250F and more. Now is better but I think it's still too much. Water pump is not OEM.

 

Might also be a weak cooling fan clutch, if you even have one...... Or, might just be the gauge isn't the most accurate thing in the world. Can you plug in with a scanner, and see what the PCM thinks coolant temp is?

 

I don't have fan with clutch. Only electronic fan- start with 220F. Yes i have scanner- he told this same as gagues. And don't show any trouble code... I had problem's with knock sensor but it's already fixed. I am very worried about the temperature of my car. When coming 225F A/C gives warm air, otherwise, the acceptance that such a temperature may be normal.

 

That does seem high.....

Maybe a weak thermostat? Doesn't open quickly enough without the water pump being at a higher rpm, thus, forcing more flow? (just a wild guess there.) If it maintains normal temp when moving though, might just be 'normal'.......

 

when moving 40-60mph is normal 203-207. When stay in traffic at iddle growing. When i give rpm in stay, temperature not falling. I make test with exclude thermostat. Engine warmed slowly but the temperature also rises to 225. Cylinder head tested and 100% correctly. Water pump is new but not original (mopar). Maybe this is problem?
In my another dodge ram 5.7 hemi 395HP temperature 203-207F all time (traffic, moving, towing) that's why I see a problem...

 

That sure sounds like a radiator issue to me. Partially clogged. Use an IR thermometer, and start scanning it across the radiator, bet you find hot/cold spots.

 

my challenger definitely climbs when i get off the highway and start hitting traffic lights and slowing down, 215-220 doesnt sound terribly high for what i recall seeing. Keep in mind tha thermostat temperatures are the temperature that they BEGIN to open at +/-3*F (iirc, might be 6) and take 15-20*F to be fully open. so say you have a t-stat that is on the high end of tolerance, it starts to open at 206 and isnt fully open till 226. 225 is within that range, and shouldnt hurt anything. Also keep in mind that chrysler designed the HEMI to run hotter than (what i consider) normal because of MDS and the decrease in heat when it engages could potentially cause lubrication problems on the deactivated cylinders.

my new 2017 RAM with the 5.7 will climb to 218-220 on the highway, at this point the grill shutters open up and it drops back to 200, annoying and worrying for me at first, but iv put 35k miles on it that way without a problem. If the temp gauge needle is still riding in the middle of the range i would expect you have no problem.


i will also note that raising the engine rpms at idle will not do anything to help cool the engine unless you have a clutch driver cooling fan (the idea of raising the rpms is to spin the fan faster and move more air without putting the load of moving the vehicle on the engine)

 

Did you ever solve this issue? If so, what caused it?