The coolant temperature it reaches in the 237 degrees?

BHAMDOC1973

MEMBER
2009 TOYOTA PRIUS
4 CYL
2WD
AUTOMATIC
70,000 MILES

Replaced the engine after it locked up, the old engine had 194,000 the use one I put in has 70,000. Started and it's all good but monitoring the coolant temperature it reaches in the 237 max, no dash lights or any codes, fan kicks on as it should. I only put water instead of antifreeze for now. And bled it per the videos online. Radiator hoses have normal pressure. Trying to find if this is normal, or antifreeze and more bleeding could cause it to go lower, all while car is parked.

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi,

In a perfect world, the temperature would stay between 195F and 220F. However, that can change based on conditions. If you told me you lived in Antarctica, I would be shocked. However, if you live in the desert, it wouldn't be that surprising. It is a little warmer than I would expect, but it may not be too far out of the ordinary because of where you live.

When you replaced the engine, did you use the sensors on the new engine? Where on the temperature gauge does the needle indicate? Is it above halfway?

Let me know.

Joe

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Monday, September 5th, 2022 AT 8:12 PM

BHAMDOC1973

MEMBER
1,657 POSTS

The vehicle does not have gauges. I used my scanner. I bled the coolant again and it's better, these are difficult to bleed. I used original sensors from the used motor except a couple. Now it stays around 199 and fan locks on at 203.

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Tuesday, September 6th, 2022 AT 5:53 AM

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi,

Thank you for the update.

Those temperatures are perfect. You must have had an air pocket slowing the flow of coolant through the engine.

If anything changes, let me know. Also, feel free to come back anytime in the future. You are always welcome here.

Take care,

Joe

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Tuesday, September 6th, 2022 AT 5:35 PM