1NZ overheating - Toyota Yaris Forums

rayfloyd170 · 08-22-2023, 07:28 AM

This happened to my Yaris as well last week, i have real-time monitor for my coolant temps and while in traffic at desert climate sometimes it goes beyond 97-98degC. also while in highspeed highway driving it randomly goes to 95C. It wasn't like this before. It used to hover at 86-88C on peak summer and even during idle for an hour it barely reaches to 90C. I was wondering since i just drain/fill with new coolant and burped the system. Also the fan is spinning high when AC is on.

I am really sure i drained a bright red/pink toyota super long life coolant and that was very clear to rule out sludge in the radiator. I also drain/fill every 2years since coolant is pretty cheap here.

In addition to that the AC is not blowing the usual cold air if it goes near to ~95degC.

Last thing on my mind was to clean the radiator with soap and rinse it with water. I went to a car wash shop to utilize the liquid bubbly soap and told the guy to lower down the water pressure and focus cleaning the radiator. In this way it can also clean the AC condenser.

Immediately after this, my coolant temp just hovers around 86-87C even on idle for long time in desert ambient temp of +45C.

Cleaning the radiator resolved my problem because there was no leak, rad cap was good and plainly it was just soiled over or the radiator/condenser accumulated dust in the desert.

Bonus, AC is now chilling cold too even at peak summer.

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08-22-2023, 07:28 AM	#40
rayfloyd170 Drives: Yaris 2016 1.3 Manual Join Date: Jun 2017 Location: SAUDI ARABIA Posts: 125	This happened to my Yaris as well last week, i have real-time monitor for my coolant temps and while in traffic at desert climate sometimes it goes beyond 97-98degC. also while in highspeed highway driving it randomly goes to 95C. It wasn't like this before. It used to hover at 86-88C on peak summer and even during idle for an hour it barely reaches to 90C. I was wondering since i just drain/fill with new coolant and burped the system. Also the fan is spinning high when AC is on. I am really sure i drained a bright red/pink toyota super long life coolant and that was very clear to rule out sludge in the radiator. I also drain/fill every 2years since coolant is pretty cheap here. In addition to that the AC is not blowing the usual cold air if it goes near to ~95degC. Last thing on my mind was to clean the radiator with soap and rinse it with water. I went to a car wash shop to utilize the liquid bubbly soap and told the guy to lower down the water pressure and focus cleaning the radiator. In this way it can also clean the AC condenser. Immediately after this, my coolant temp just hovers around 86-87C even on idle for long time in desert ambient temp of +45C. Cleaning the radiator resolved my problem because there was no leak, rad cap was good and plainly it was just soiled over or the radiator/condenser accumulated dust in the desert. Bonus, AC is now chilling cold too even at peak summer.