1NZ overheating

[ojeysky]

Am reading the temp from my scanner (Blue driver), I once flushed the radiator before putting in a new coolant. How do I know if the temp sensor is bad? By temp sensor, do you mean the ambient temp because that one isn't even existing on the car? (May have pulled out without me knowing). Though I don't know where the scanner gets a reading of 81C from since the sensor wasn't existing.

On the gasket, I was driving on the highway and I suddenly saw the overheating light on the dash, thereafter I was told my gasket was bad because coolant gets thrown out if I start the engine with rad cap open.

After changing the gasket, my temp hasn't gotten beyond 110C but I think it's just because I now actively monitor the temperature as I think it may have overheated otherwise.

Thanks for helping out so far.

[dogsridewith]

Originally Posted by ojeysky

Am reading the temp from my scanner (Blue driver), I once flushed the radiator before putting in a new coolant. How do I know if the temp sensor is bad? By temp sensor, do you mean the ambient temp because that one isn't even existing on the car? (May have pulled out without me knowing). Though I don't know where the scanner gets a reading of 81C from since the sensor wasn't existing.

On the gasket, I was driving on the highway and I suddenly saw the overheating light on the dash, thereafter I was told my gasket was bad because coolant gets thrown out if I start the engine with rad cap open.

After changing the gasket, my temp hasn't gotten beyond 110C but I think it's just because I now actively monitor the temperature as I think it may have overheated otherwise.

Thanks for helping out so far.

maybe U the 2nd one this week killing a Yaris engine by driving along w/ over-temp lamp lit and broken serpentine belt? (or something else disabling the cooling system) but maybe not. maybe neither head gasket is bad and you're just seeing boiling coolant.

[ojeysky]

Originally Posted by dogsridewith

maybe U the 2nd one this week killing a Yaris engine by driving along w/ over-temp lamp lit and broken serpentine belt? (or something else disabling the cooling system) but maybe not. maybe neither head gasket is bad and you're just seeing boiling coolant.

Nope, the gasket change happened earlier in the year, when I had overheating light and my belt is fine.

[B.B._07]

Originally Posted by ojeysky

On the gasket, I was driving on the highway and I suddenly saw the overheating light on the dash, thereafter I was told my gasket was bad because coolant gets thrown out if I start the engine with rad cap open.

After changing the gasket, my temp hasn't gotten beyond 110C but I think it's just because I now actively monitor the temperature as I think it may have overheated otherwise.

Thanks for helping out so far.

When you had the head gasket changed did you have the root cause of the overheating addressed? If not changing the head gasket is kind of like treating the symptoms but not the disease.

Once the car reaches operating temp (once the cooling fan starts cycling on/off) you shouldn't see any bubbles or foaming at the top of the radiator.

Your long term fuel trim value of -13.3 indicates the car is running rich which seems to be validated by the poor fuel economy you're experiencing.