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Old 05-21-2015, 01:56 PM
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Coolant Flush

Hello,

I have a new to me 2011 JGC Overland 5.7. I'd like to flush my system and change the thermostat while I'm at it. Is there a recommended way to flush and fill, or is it just like anything else? Also, I see different thermostats and temps, but still not sure what I need. Can I use a lower stat without getting a code? I think stock is either 195 or 203... But would like to do 180 or 190 without a code popping up.

Thanks in advance,

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Old 05-21-2015, 07:09 PM
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Re: Coolant Flush

Just put a 180' in my SRT Hemi, prior to that I put one in my 5.7 Hemi Ram, in both cases no issues occurred..... as to flushing, I opened the radiator drain plug and let it drain. I also sucked out all the coolant in the overflow tank and cleaned that out, then i put a fresh water hose into the radiator inlet and let the Jeep run for about a half hour, also good to have the heater on high, then I let it all just drain out again with the engine shut off, when it appeared that only clear water was draining out, i let it go until nothing more was draining out and then closed the radiator drain and filled the system with new MOPAR pre mixed coolant......Be sure to use only the "OAT" or "HOAT" coolant called for, no mixing the two!!!!. Use only the type your owners manual calls for....
Now if your just changing the thermostat, you don't have to drain the system to do this....You can just get a gallon zip lock bag, hold it under your thermostat housing, loosen the bolts and let the coolant drain into the bag you won't get that much....then remove the thermostat housing, hold your bag up again and remove the thermostat, you will get more coolant draining out, swap your thermostat, If your adding a fancy billet housing, I suggest using some silicone sealant when reassembling, and if your going chrome, I would use some thread locker on the bolts......anyway reassemble, pour your drained coolant back into your system, take a drive and then check for any leaks and top off your coolant if necessary........ should be good to go!!!!
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Old 05-22-2015, 07:04 AM
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Re: Coolant Flush

Quote:
Originally Posted by theweavman View Post
Just put a 180' in my SRT Hemi, prior to that I put one in my 5.7 Hemi Ram, in both cases no issues occurred..... as to flushing, I opened the radiator drain plug and let it drain. I also sucked out all the coolant in the overflow tank and cleaned that out, then i put a fresh water hose into the radiator inlet and let the Jeep run for about a half hour, also good to have the heater on high, then I let it all just drain out again with the engine shut off, when it appeared that only clear water was draining out, i let it go until nothing more was draining out and then closed the radiator drain and filled the system with new MOPAR pre mixed coolant......Be sure to use only the "OAT" or "HOAT" coolant called for, no mixing the two!!!!. Use only the type your owners manual calls for....
Now if your just changing the thermostat, you don't have to drain the system to do this....You can just get a gallon zip lock bag, hold it under your thermostat housing, loosen the bolts and let the coolant drain into the bag you won't get that much....then remove the thermostat housing, hold your bag up again and remove the thermostat, you will get more coolant draining out, swap your thermostat, If your adding a fancy billet housing, I suggest using some silicone sealant when reassembling, and if your going chrome, I would use some thread locker on the bolts......anyway reassemble, pour your drained coolant back into your system, take a drive and then check for any leaks and top off your coolant if necessary........ should be good to go!!!!
Thanks for the info. Thought at least a few others would have done this by now. Just as long as there's no special "jeep" or Hemi tricks, I'm good. My first Mopar, so wasn't sure if was straight forward. Good to know a 180 will work also. Temps are a bit higher than I've seen in my daily's. It seems the temps are never below 200, ever. And it's not even summer here yet and we're in mid 90's.

Thanks,
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