How are you measuring the engine temp? And what conditions are getting these temps? Just at idle with the vehicle NOT moving, or do you get the same temps with the vehicle moving at high way speeds?
I don't know the exact specs for this engine/vehicle combination, BUT, usually the water temp should be the same as the thermostat at most places the engine water temp is measured. Just about all Chrysler Engines that is 191°F to 195°F. There are spots in the water jacket that the actual water temp will vary, so some aftermarket water temp gauges that have the sensor installed in water jacket drain plugs or freeze plugs may show a different temp than is measured for the PCM or the gauge on the dash.
Some vehicles, the engine temp might climb 10-20° before the fan turns on to cool it off within 10-20 seconds to the normal temp of 195°F, it might cycle up and down in some situations like that when sitting stopped at idle. But maintaining 225°F, assuming your measuring the temp at the water pump/thermostat which is shown on the dash gauge, is NOT normal.
The cooling system should have the additional capacity to run the AC without the engine water temp increasing. The fact your engine water temp is going up while you run the AC indicates something is wrong with the cooling system and it has reduced capacity.
1.) Check coolant level, that means inside the cooling system, NOT just the level at the overflow bottle. Only with the engine cool, open the pressure cap and make sure the coolant comes up to within 1" of the filler neck top. A leak can cause air to be sucked back into the cooling system, instead of overflow coolant in the overflow jug. Chargers/Challengers at one point went to an open cooling system, with the pressure cap on the overflow jug, in these systems, there will NOT be any difference in the coolant level in the jug and the rest of the system. And you can tell, because the only pressure cap on the system is on the jug.
2.) The OEM coolant of this era Chrysler is likely HOAT, with a 5year/100k mi life. Is the vehicle overdue for new coolant? Service it if that is true. Personally, I change the thermostat when changing coolant.
3.) Check for leaks, check the system maintains pressure, squeeze the radiator hoses when its cool, then squeeze the hoses when its hot, the hoses should be significantly harder from pressure being held inside, it they are NOT it might be as simple as a bad pressure cap.
4.) Check the engine fan comes on, or if it has a viscous clutch engine driven fan, the viscous clutch isn't worn out. NOT enough airflow through the radiator will cause hot running, more so at slow speeds and stopped at idle.
The cooling ability of the coolant doesn't degrade with time, what degrades with time is the anti-corrosion additives. Meaning, worn out coolant won't make your engine run hotter, but worn out coolant will let your cooling system corrode, water pumps suffer erosion, worn out additives can form solids that clog the system and damage can occur to the cooling system to make it run hot. So if you haven't kept up with the cooling system maintenance, you may have some damage to repair.
Yep, I'm thinking of a majority of vehicles where they measure the temp (place the temp sensor) at the thermostat/water pump. In those cases, when the thermostat starts to open and mix with radiator cooled coolant, the temp stays steady right around the opening temp of the thermostat. Sounds like the Hemi or at least in the Charger, the temp is measured somewhere else for this readout? Or does the Hemi run hot enough, it actually gets temp surges at the thermostat/water pump?A bit more info:
The factory thermostat is not designed to be fully opened to 220º, so the radiator won't always be keeping the temp at 203º (for a 203º thermostat for example).
I think there are two stages for the radiator fans, low speed on at around 209º, high speed on around 219º.
I see this post is a year old but would like to comment on it. I have a 2006 Daytona and noticed the temperature last weekend when I drove it was at 231 on the open road. Today it was 226 on open road. Scanned it, no codes, fans are working correctly, coolant is fine. My temp hand is in the middle and nothing indicates this is too hot.I have a 2007 charger Daytona, what should the normal operating temp range, stock tstat, radiator full, 90 degree weather no a.c. running, cooling fans running. I'm getting 215 - 225, with a.c. it runs up to 234. Is this a normal range
I'm nit-picking, but if the temp sensor solved the problem it wasn't an overheating problem, it was a bad sensor indicating erroneous temperatures. Regardless, it solved the problem, and that is what you meant.Thanks guys.......I'm going to change the coolant temp sensor tomorrow, it's located on the side of the water pump. A friend of mine had an overheating problem on his 05 magnum 5.7 an it fixed it. The readings are from the factory EVIC which displays things like oil pressure , ave mpg, engine temp etc..both electric cooling fans are working.
Mine usually stays around 215-219. I cant say I've ever noticed it much higher than this. I don't live in a normally hot climate however. From what info I've been able to find on this in the past, the 5.7 is designed to run at 215 (approx). Thermostat opens at 203, Low Fan cut in @209, High Fan cut in @219.I see this post is a year old but would like to comment on it. I have a 2006 Daytona and noticed the temperature last weekend when I drove it was at 231 on the open road. Today it was 226 on open road. Scanned it, no codes, fans are working correctly, coolant is fine. My temp hand is in the middle and nothing indicates this is too hot.
Did you ever figure out why yours was running hot - mine has never stayed at 203 but normally around 215 - 216 and on up to the 231 I mentioned.