Cooling problems with 3.6

[Petey]

If it was head gasket wouldn’t coolant levels be dropping? My coolant levels are always the same

Maybe I remember wrong but didnt u say u boiled over?

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[Joaquim]

Maybe I remember wrong but didnt u say u boiled over?

Nope, computer prevented engine from getting hotter

 

[Joaquim]

Is it still under warranty? If so, get it in and do it on Jeep's dime. Definitely a problem there and I don't think it is your bumper or winch. I've driven hard as heck in hot temps at high altitude and never have seen a coolant temp above 224.

Hope you get it taken care of!

Partial warranty, currently waiting on dealer to get steel steering gear and new ECU for other problems

 

[Petey]

Nope, computer prevented engine from getting hotter

if u get a chance, do this also . when that gauge starts climbing to stratospheric levels turn on heater and fan full blast ... i know this is un comfortable in ur situation but should help the engine cool down by some. I dont want to hear stories of some guy cooking himself to death but this would give us better idea if u need a bigger rad

 

[mwilk012]

what are some other signs it could be the thermo? It seems like the radiator is unable to keep the coolant cool enough under heavy load w/ high temps and that means either the coolant is no good or the radiator has dirt covering it prevent heat dissipation

Equal or nearly equal temperature at the radiator inlet and outlet, undetectable without special instrumentation.

I’ll switch to my PC and provide thermal equations here in a bit that explain the process a little.

 

[Petey]

Is it still under warranty? If so, get it in and do it on Jeep's dime. Definitely a problem there and I don't think it is your bumper or winch. I've driven hard as heck in hot temps at high altitude and never have seen a coolant temp above 224.

Hope you get it taken care of!

A 2018 model ? he'll be lucky if they don't kick him in the rear and call it a day . I have a 2020 and the the dealer says I have nothing to claim even though they mentioned 3 yrs upon purchase I'd be protected . They gave me a curtesy alignment which according to them was a 500+ dollar make me hola service. Said they could not give me printout of the measurement and there went by a whole day with nothing really done to the vehicle. Still pulls right ..

 

[DanW]

A 2018 model ? he'll be lucky if they don't kick him in the rear and call it a day . I have a 2020 and the the dealer says I have nothing to claim even though they mentioned 3 yrs upon purchase I'd be protected . They gave me a curtesy alignment which according to them was a 500+ dollar make me hola service. Said they could not give me printout of the measurement and there went by a whole day with nothing really done to the vehicle. Still pulls right ..

The powertrain warranty is longer than 3/36. Unless they consider this not to be a part of the powertrain.

 

[Petey]

Equal or nearly equal temperature at the radiator inlet and outlet, undetectable without special instrumentation.

I’ll switch to my PC and provide thermal equations here in a bit that explain the process a little.

When hot coolant passes through a radiator in a vehicle ti the inlet there should absolutely be a difference one can feel just by simple touch on the hose.. no need for fancy shmancy

 

[Petey]

The powertrain warranty is longer than 3/36. Unless they consider this not to be a part of the powertrain.

Thats what they sold me but what amount is it now?

 

[Petey]

Nope, computer prevented engine from getting hotter

Do u remember any actual numbers ?.. there should be a selection on the screen that gives actual numbers in degrees.. the digital readout

 

[mwilk012]

When hot coolant passes through a radiator in a vehicle ti the inlet there should absolutely be a difference one can fell just by simple touch on the hose.. no need for fancy shmancy

It will just be smoking hot all over, these engines run hot. Should have a fairly easily observable temperature differential across the radiator whenever the thermostat is open.

The problem here is the capacity of the system to cool is reduced, thus causing an increase in T(hot).

Thermal Power of a given heat exchanger = (mass flow rate)(specific heat capacity)(Thot-Tcold)
Thermal Power also = UA(Twater-Tair) where U = efficiency of the heat exchanger and A is the area.

When analyzing, temperature should be assumed to be at steady state, aka operating temperature. The problem in OP's case is that Thot (his overheating operating temp) is too high. The particular situation only occurs at periods of high heat influx from the engine (which uses the same equation though the values are hard to determine).

By design, maximum thermal power of the radiator should be greater than thermal power of the engine.

In the case of the radiator being clogged, on either the coolant or air side, the total U and/or A is reduced, causing a lower Q and therefore a higher Tcold, which in turn causes Tavg to rise and turn on a nice blinky red light.

Oh, and upping the ratio of water to glycol raises the specific heat capacity, the amount of energy that 1lb of coolant can absorb in a 1F temp change.

 

[mwilk012]

The powertrain warranty is longer than 3/36. Unless they consider this not to be a part of the powertrain.

It is not part of the powertrain, until you overheat it to death and kill the engine, ironically. Though if they find a blown head gasket AND a muddy radiator, you're looking at a 10k bill.

 

[jaymz]

The powertrain warranty is longer than 3/36. Unless they consider this not to be a part of the powertrain.

Not that it really matters with Jeep dealers as they all seem to follow their own rules, but my radiator was leaking at 38 months with 31,000 miles and my local dealer would not cover the repair under the powertrain warranty.

 

[mwilk012]

Not that it really matters with Jeep dealers as they all seem to follow their own rules, but my radiator was leaking at 38 months with 31,000 miles and my local dealer would not cover the repair under the powertrain warranty.

Man, I read that and thought for some reason it was going to end with "and they covered in under warranty just to take care of a customer." but of course, that almost never happens.

 

[Petey]

It will just be smoking hot all over, these engines run hot. Should have a fairly easily observable temperature differential across the radiator whenever the thermostat is open.

The problem here is the capacity of the system to cool is reduced, thus causing an increase in T(hot).

Thermal Power of a given heat exchanger = (mass flow rate)(specific heat capacity)(Thot-Tcold)
Thermal Power also = UA(Twater-Tair) where U = efficiency of the heat exchanger and A is the area.

When analyzing, temperature should be assumed to be at steady state, aka operating temperature. The problem in OP's case is that Thot (his overheating operating temp) is too high. The particular situation only occurs at periods of high heat influx from the engine (which uses the same equation though the values are hard to determine).

By design, maximum thermal power of the radiator should be greater than thermal power of the engine.

In the case of the radiator being clogged, on either the coolant or air side, the total U and/or A is reduced, causing a lower Q and therefore a higher Tcold, which in turn causes Tavg to rise and turn on a nice blinky red light.

Oh, and upping the ratio of water to glycol raises the specific heat capacity, the amount of energy that 1lb of coolant can absorb in a 1F temp change.

Yes... needs a new thermiator .. "maximum thermal power of the radiator should be greater than thermal power of the engine".- I wish I could joke about this but were in 2000s and very few american manufacturers seemed to figure this out. Our systems are taxed with oil and exhaust cooling . It just seems to me that they field tested vehicles in the arctic during the winter.

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