Coolant Level Low

I took my Tundra to the dealer for an oil change and the tech said my coolant was low, too low. He said he topped it off. The tech also said he did not see any leaks but it was possible there’s a leak.

I then discussed situation with the service advisor and I asked him, “where did the coolant go?” The way he explained it is that there’s an area somewhere in the engine where coolant sits and can eventually dry and crystalize, but he said they’d have to do a diagnostic on the my truck to be sure. He said keep an eye on the coolant level when you fill the truck with gas.

I drive the truck home and pop the hood and the coolant is already low, that is, it's not at the top of the reservoir, it's about half way down. I leave the truck in the garage for about 4-5 hours and come back and the coolant has dropped down to the LOW line.

Here’s the deal, I’m pretty particular about watching my temp gauges on my engine and transmission temp, I’m pretty good about glancing at them when I’m driving and my engine temp guage always stays in the same spot, just a tad away from the middle of the dial but on the cool side.

Please give me your advice, is there a problem? Should I just add some water and see if that helps keep the coolant level at the correct capacity line in the reservoir because it’s just low? If you think there is a bigger problem what do you think is going on? There’s no leaks, at least no obvious leaks. I seriously doubt the coolant is leaking into the engine because I’d smell something, or the temp gauge would bounce around or I’d seen a milky stuff on the dipstick.

Thanks for your help and advice

 

Do a pressure test first, then a combustion leak test.

 

Look around the bell housing for dried coolant. You could send in an oil sample to check for HG failure.

 

Ok, I just found a video in the 2.5 Gen Tundra forum and yep, I pretty much now know what the problem is, thanks again for your replies

https://youtu.be/PnUL0GR6mfs?si=oQRozDmX9-LEFp5U