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  #1  
Old 02-04-2016, 11:10 PM
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Coolant temps

Hey guys,

My srt seems to be having cooling issues ever since I did a oil change and transmission fluid and filter service. My temps were always cool before(lower than v6 or 5.7 hemi). My gauge has alway been less than half and usually running around 203-212F. Now I notice the gauge is more in the middle and temps are fluctuating all the way to 221F with normal driving and as high as 228F uphill.
I also think the truck is running rougher at idle when in traffic.
I can't figure out what is causing this. I noticed upper hose pinching after shutoff and found clogged radiator overflow hose(was brown thick substance). The tank was also clogged as the plastic melted the passage for the coolant to circulate. I replaced the hose and overflow tank and this solved the pinching problem but not the temp problem. I then replaced upper and lower radiator hoses along with thermostat and engine oil again just in case.
The problems continues.... Anyone have any idea what this could be?

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  #2  
Old 02-05-2016, 01:47 PM
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Re: Coolant temps

anti frezze fkush? or air in system?
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Old 02-05-2016, 08:17 PM
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Re: Coolant temps

I also did an antifreeze flush when changing the thermostat. I put mopar antifreeze. Can air in the system do that? It doesn't overheat. The truck is just running warm when driving and really warm uphill and when I get into the throttle. If I park the truck and let it run, the coolant temp will stay at around 203F.
I am really stumped! I have no idea other than to change the remaining cooling parts that I have not changed yet... (Fan, radiator, water pump).
A friend of mine mentioned the spark plugs and wires. But I really doubt that they can be causing temp issues. Maybe spark plugs and wires can help with rough idle? I'm not sure how to proceed.
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Old 02-05-2016, 08:49 PM
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Re: Coolant temps

Yes air in the system will make that gage jump a round also check fan operating,
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Old 03-31-2016, 11:14 PM
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Re: Coolant temps

I Just replaced the fan just in case and the truck is still doing the same thing. The mechanic once again double checked for air in the system but he is persuaded it is clear of air. any ideas? I am thinking of changing out radiator and water pump along with coolant temp sensor. I am running out of things to change at this point. Someone please help with any ideas! Truck stays around 201-203 at idle. After driving for bit and the system gets nice and warm the temps go up while driving. They fluctuate up to 222 with very normal driving conditions. They go back to 201-203 if I park and idle. Could transmission cause this? Maybe some sort of leak but I don't see anything visibly leaking! Truck never did this before.
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Old 04-01-2016, 07:45 AM
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Re: Coolant temps

Quote:
Originally Posted by alext View Post
I Just replaced the fan just in case and the truck is still doing the same thing. The mechanic once again double checked for air in the system but he is persuaded it is clear of air. any ideas? I am thinking of changing out radiator and water pump along with coolant temp sensor. I am running out of things to change at this point. Someone please help with any ideas! Truck stays around 201-203 at idle. After driving for bit and the system gets nice and warm the temps go up while driving. They fluctuate up to 222 with very normal driving conditions. They go back to 201-203 if I park and idle. Could transmission cause this? Maybe some sort of leak but I don't see anything visibly leaking! Truck never did this before.
Are you maybe a little low not topped off properly?? Check anti freeze before driving in morning overflow and radiator.
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Old 04-01-2016, 07:47 AM
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Re: Coolant temps

Water pump could be due to change but check coolant in morning before driving overflow and radiator you might just be low..check before you even turn on truck
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Old 05-22-2016, 01:43 AM
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Re: Coolant temps

Hello check the grade of oil you used 5w30 being heavier than the 5w20 the Hemis require. Have you got trouble codes? Also before you do all that work check your radiator cap it is pressurized and may be under performing. I hope this helps
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Old 05-25-2016, 12:44 PM
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Re: Coolant temps

Quote:
Originally Posted by colonelD33 View Post
Hello check the grade of oil you used 5w30 being heavier than the 5w20 the Hemis require. Have you got trouble codes? Also before you do all that work check your radiator cap it is pressurized and may be under performing. I hope this helps
Not to derail, but where is 5w20 required for the SRT hemi? The 6.4 requires a 0w40....
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Old 05-25-2016, 01:15 PM
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Re: Coolant temps

Check you owners manual, fir proper oil my jeep with a hemi not a srt requires 5 20 for the MDS system not sure what 6.4 srt 8 needs oil would not cause you to run hot just might mess up MDS system
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Old 05-25-2016, 01:43 PM
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Re: Coolant temps

Hello the 5W20 is called for on the 5.7 Hemis in wk GC's with MDS. I know low oil can cause extra use of antifreeze therefore overheating. Oil cools the engine as well as lubricates it and prevents rust. Likewise if your low on antifreeze you will consume oil. And yes the last poster was right wrong oil will effect your MDS which I believe will effect engine temp.
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Old 05-25-2016, 02:32 PM
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Re: Coolant temps

What low on oil??? More antifreeze? ??low on antifreeze more oil you have other problems. .......wow makes know sense
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