Your friends 2015 JK is running hot climbing hills on highway, what causes do you suspect?
- Thread starter 1RNGR
- Start date
Disciple Off Road
Hooked
What gear ratio is he running? Any long climb at high rpm’s will get anything hot.
OverlanderJK
Resident Smartass
The cause is 40’s on a JK. They come with 32’s. Turn your ac off and turn the heat on. Or put it back to stock.
1RNGR
Caught the Bug
5.38 on Currie D60's 8 lug
Disciple Off Road
Hooked
Any 3.6 is going to struggle, JK’s get heavy fast. Just make sure his fan is working and fluids are good. And just cruise the inclines at 40mph lol
Bierpower
Hooked
This one kills me. The number of vehicles I see driving around with a whole pile of accessories towering in front of the grill. I've seen a couple jeeps and pickups with the designer "grill inserts" with a winch on top of the bumper and a bull bar with some 8" round lights all directly in front of the radiator. Then to top it off they start making vehicles without a temp gauge.
JeepFan
Hooked
One thing you can check and it's pretty easy is to inspect for debris between the A/C condenser and radiator. Pull the plastic cover on top of the radiator and look to see if there's bugs, dirt and vegetation clogging the rad fins. My 09 JK had all kinds of crap trapped in the radiator restricting good air flow.
DirtHeadDavis
Hooked
The BAD Influence
Active Member
I have a 2015. We have had issues with it over heating once lifted and bigger tires were added. Even blew a head gasket. Local dealer repaired under warranty. Still had problems. Put on a new bumper, lowering the winch from blocking the radiator. Changed the thermostat. Still issues. Finally found a shop who asked "Is it a 2015? Ok, it needs a new water pump". Upon further discussion, any time they have a JK customer with over heating issues, that's their first question. And they've tried after market water pumps, that don't solve the problem either. They replace with Mopar water pumps only. And only have issues with 2015s.
