#Engine coolant over temperature full
#Engine coolant over temperature code

If it keeps coming back and especially if your coolant level keeps dropping, then start looking for leaks.

#Engine coolant over temperature full

Regardless, you changed the thermostat, make sure the cooling system is full of the correct antifreeze and water (you really need to check under the pressure cap ONLY WHEN THE ENGINE IS COLD to know the system is full, not the bottle).

#Engine coolant over temperature code

In my case it was a very small and intermittent head gasket leak, that only happened for a few moments when starting a cold engine.the misfire code I got was from the HG leak allowing coolant to be sucked into the one cylinder and then the P0128 from being very low on coolant.Īrguably, just a leak in the cooling system or a bad/old and out of calibration temp sensor could do the same thing for the P0128. and it might just be the temp sensor takes longer to register the warm up from there being less coolant. Let it run hotter and if its too low overheat.What I have found on my past Jeeps, low coolant level will result in the engine taking longer to warm up. Low coolant level will let temps spike sooner and higher. In my experience, if you get code P0128 and you don't have other signs of a failed thermostat, like overheating or over cooling (never reaching full engine temp in cold ambients) the problem is not the thermostat but something else in the cooling system or something with the engine.

The code is for emissions, since engines make more pollution cold than warm, the Gov makes them turn on the CEL if it takes longer than normal for the engine to warm up.Īfter changing the thermostat, you topped off with the correct antifreeze and water mix, correct? You're cruising down the highway at a steady speed and load, and engine temp is at 210☏, yea, I'd suspect you have cooling or engine problem.Ĭlick to expand.If the engine is taking to long to warm-up, then yes the first suspicion should be the thermostat. if you get the steady climb up while sitting at a stop, that cools down with the fan turning on, or if you're towing uphill and it cools down to normal after easing off the heavy load. I don't know the temps for the 3.6L, I imagine they are close to those I spoke of above.so a 210☏ shouldn't hurt the engine at all, and depending on the conditions you see that temp, it might mean a perfectly fine working cooling system or perhaps something wrong with the cooling system or engine. When I sit at a stop in winter, I notice the temperature start climbing up steadily till it reaches 222-224☏, you hear the fan come on at full speed and the temp drops steadily back toward 203☏ and sometimes before that, the fan turns off again, or at least goes back to a slow speed where it is silent. Sitting at a stop with AC on in the summer, I only notice temps go up a few degrees, cause the fan is running for the AC. Remember when you have the AC on, the fan turns on to cool the AC condenser and thus keeps airflow though the radiator. On the 5.7L, the fan turns on full at ~224☏, its thermostat temp is 203☏, with good airflow through the radiator, like moving at some speed, it typically runs a few degrees cooler than the thermostat 203☏ and very hot days or with heavy loads, it might run a degree or two higher than 203☏. So if you don't have enough airflow through the radiator, like sitting at a stop, the engine temp will rise slowly till it hits the highest acceptable point, the electric fan will turn on and cool it back down to the normal temp given you some safety margin for engine temps to spike up a bit without endangering the engine. the engine could run all day at that temp or at worst a few degrees cooler than that temp. Look up the specs for your electric fan turning on, if the electric fan would turn full power at the highest point that would be acceptable temps for the engine, i.e. Whats the P0128 code? Is that the old 'Engine takes to long to warm Up' code?