2007 ES350

Popped the hood to put in some washer fluid and noticed the coolant level is near the "L" line. Everything is working properly and I didn't notice leaks.

I was going to top it off but wanted to know if it's ok to use Zerex instead of the OEM Toyota coolant. I was also thinking about doing a complete flush when I take it in for the next oil change next month. I know my water pump was changed about 2 years ago so I'm not sure if they flushed it then or just did a top off since coolant poured out during the install.

 

You can use destiled water.

 

If your water pump was replaced 2 years ago then they replaced most of your coolant at that time. They will not save and reuse old coolant on a car that old.

Do not use Zerex. It is not compatible and will clog up your system due to chemistry not being compatible and the cost to flush it out will make you unhappy.

Distilled water is fine to top up that container. You need OEM fluid or Zerex Asian Vehicles, or Prestone Asian Vehicle coolant or the NAPA version.

 

I third, distilled water. If you know what was used when the water pump was replaced, use that or distilled water and nothing else. You next want to know why the coolant level is low. It could simply be that air bubbles have worked their way out from the last coolant change. Top it off and keep an eye on the level.