Slowcrash_101

Radiator is OEM, 4 years old, was replaced by previous previous owner. No leaks, cap holds pressure, running Toyota long life pink coolant. No leaks OEM hoses, system holds pressure, top hose is rock solid after driving. I know how to bleed the system(my heater damn near gives me 1st degree burns while sitting at idle), I just want to know that if in a half year time span of daily driving it's possible for coolant to evaporate from the overflow. I'm talking minute amount like 1/3 finger width worth of level.

I suppose I'll know next month.

fredsvt

I have noticed, Toyota pink does seem to drop faster than most. And, if you do have any leaks, the dried pink crust is extremely obvious.

In my experience with Yoda products it seems (coolant) to be VERY hard on radiator cores where the tubes meet the ends, they tend to crack from inside out and leak and the cores end up covered in pink crust. Many later model Toyotas use aluminum rad cores with aluminum tanks, with bolt on plastic hose adapters. I've also seen a very much higher incidence of water pump seal leakage, on nearly all engines they build. May be a pump supplier issue or not.

I can't see it evaporating from the little plastic overflow, however as mentioned if your cap isn't allowing the system to hold to full pressure, and you're hard on the car, there's a possibility of localized boiling in the head, which would cause water evaporation and a drop in level.

windhund116

Slow, any reason why you didn't use OEM Honda Coolant? IME, it's the best thing on the market. Use it in my Wifey's Lexus.

Slowcrash_101

The new pink coolant is chemically identical, it's just pink instead of blue. Plus I get it at $8 a gallon from my connection.

I blame the Toyota problems on its auto coolant bleed system and short trip drivers.

*I do a coolant swap every 2 1/2 years anyway.

zeroptzero

It does evaporate since the overflow tank is vented, if the rad dumps hot fluid that is 50% water it only makes sense that you will get some evaporation. How much is anyone's guess , but in theory it should happen. I've seen it happen on my car to some degree.