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Message
Place your bets- Why is this car overheating?
Posted on 4/20/26 at 6:07 pm
Posted on 4/20/26 at 6:07 pm
Knowns-
-Fluid is topped off.
-Does not overheat when idling in driveway.
-Fan works.
-Overheats when driving.
-Cools down quickly when heater is turned on.
-Radiator installed in late 2024 (relatively new)
2015 Cherokee
-Fluid is topped off.
-Does not overheat when idling in driveway.
-Fan works.
-Overheats when driving.
-Cools down quickly when heater is turned on.
-Radiator installed in late 2024 (relatively new)
2015 Cherokee
This post was edited on 4/20/26 at 6:08 pm
40
Posted on 4/20/26 at 6:09 pm to deeprig9
Another known-
No check engine light.
No check engine light.
Posted on 4/20/26 at 6:10 pm to deeprig9
quote:
why is this over heating?
quote:
2015 Cherokee
Posted on 4/20/26 at 6:11 pm to deeprig9
Possibly a bad thermostat.
Posted on 4/20/26 at 6:11 pm to deeprig9
Partially stuck thermostat, air in system, or collapsed hose.
Posted on 4/20/26 at 6:11 pm to W2NOMO
quote:
Thermostat much?
If stuck closed, why would it not overheat at idle?
Why would it cool down when the heater is turned on? Does the thermostat not control the entire coolant flow?
Posted on 4/20/26 at 6:12 pm to deeprig9
All the AI's say a bad thermostat in this model throws check engine light codes.
I have no codes. No CE light.
I have no codes. No CE light.
Posted on 4/20/26 at 6:13 pm to W2NOMO
quote:
Thermostat much?
Posted on 4/20/26 at 6:14 pm to deeprig9
How's your water pump?
Posted on 4/20/26 at 6:15 pm to deeprig9
Low heat produced while idling. Bypasses the thermostat when heater is turned on. Acts as a mini radiator.
Posted on 4/20/26 at 6:17 pm to deeprig9
quote:I’ve changed many thermostats over the years. It’s the first and easiest to change. Nothing is certain but changing a thermostat is easier than water pump. Start with thermostat.
All the AI's say a bad thermostat in this model throws check engine light codes. I have no codes. No CE light.
Posted on 4/20/26 at 6:18 pm to deeprig9
Thermostat or water pump.
By turning the heater on, you’re adding a lot of excess cooling (engine cooling) capacity via the heater core now acting like a radiator and dumping that heat energy into your cabin.
Thermostat is cheap and easy.
What I said above about the water pump should be your next step- because of the pump is now at a lower flow state and needs the excess area in the cooling package to offset that.
By turning the heater on, you’re adding a lot of excess cooling (engine cooling) capacity via the heater core now acting like a radiator and dumping that heat energy into your cabin.
Thermostat is cheap and easy.
What I said above about the water pump should be your next step- because of the pump is now at a lower flow state and needs the excess area in the cooling package to offset that.
Posted on 4/20/26 at 6:21 pm to deeprig9
Ask your husband
Posted on 4/20/26 at 6:21 pm to W2NOMO
I've changed thermostats in 1977, 1986, and 1999 models.
I agree, very simple.
Not simple in these newer vehicles.
Exhibit A-
I agree, very simple.
Not simple in these newer vehicles.
Exhibit A-
This post was edited on 4/20/26 at 6:29 pm
Posted on 4/20/26 at 6:24 pm to deeprig9
quote:
Why is this car overheating?
quote:because it’s past time to he put to pasture
2015 Cherokee
Posted on 4/20/26 at 6:24 pm to deeprig9
It's 11 years old
Thermostat
Failed coolant temp sensor or circuit including the relay
"Overheats when driving" is the fan coming on when driving? or only in the driveway?
"Cools down quickly when the heater is on" This sounds like a clogged and dirty radiator and it simply needs a "power flush" and an exterior radiator fin cleaning
Thermostat
Failed coolant temp sensor or circuit including the relay
"Overheats when driving" is the fan coming on when driving? or only in the driveway?
"Cools down quickly when the heater is on" This sounds like a clogged and dirty radiator and it simply needs a "power flush" and an exterior radiator fin cleaning
Posted on 4/20/26 at 6:32 pm to deeprig9
Have you confirmed it is actually overheating, rather than just looking at the temp gauge? Maybe a bad temp gauge?
Posted on 4/20/26 at 6:34 pm to Disco Ball
quote:
This sounds like a clogged and dirty radiator and it simply needs a "power flush" and an exterior radiator fin cleaning
I concur. I have a habit, every 5yrs, drain & flush cooling system, and replace coolant…
Posted on 4/20/26 at 6:39 pm to subMOA
quote:
By turning the heater on, you’re adding a lot of excess cooling (engine cooling) capacity via the heater core now acting like a radiator and dumping that heat energy into your cabin.
This guy knows how engines work
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