Losing Coolant in Reservoir

Hey all!
In case you’re wondering I got my leak fixed and am home safely now.

New unrelated question!

My coolant has been spitting out of my overflow Reservoir. It mostly happens on startup. There are no other leaks at this point and I have no idea why this happens.
I do notice that over a period of maybe a month I no longer see coolant at the top of the radiator. Once I fill it and the Reservoir, it tends to shoot out the reservoir upon startups until its empty and the radiator level will also go down.

Perhaps I’m over filling and it’s just getting rid of the excess?

What do you guys think?

 

Bad radiator cap?
Clogged radiator?

Those come to my mind

 

Spitting? Out of overflow reservoir? On startup?

I think you continue to have serious unresolved engine/cooling system issues that will ruin your aluminum engine if not fixed soon.

 

Yeah I was hoping your side post from yesterday wasn’t something major. Sounds like you’ve some problems with the cooling system which the others covered above. A new Denso cap costs about $14.

My reservior is just above the L mark when cold starts. It rises to exactly the F line when engine is at full operating temp of 185°.

Side note: I just did a timing belt job and replaced the old radiator with a new Denso. The old rad was fine and not leaking/no visible problems. The temps were in the 195-200° range which I thought was normal. The new radiator surprised me and runs at 183-185°.

I cut open the 8 year old radiator and didn’t see any blockages. I also did a coolant system flush with Prestone (twice).

Start with a new cap and see if that fixes it and then work on the other stuff. Caps do go bad over time and should be replaced every 4-5 years.

 

I still cant believe how warm your truck ran compared to others. Dont get me wrong those are safe levels, but still

 

Yeah. I had no idea. I remember some others trucks reading about the same 195-200° on the OBD thread. I have no idea why it was hotter before, but I like the new 185° lower temps.

 

I know it’s been awhile but I got caught up in so much, I forgot about tundras.com!

Long story short, I took it to a mechanic who completely overhauled my cooling system and fixed all my issues. My main problem was caused by a dime sized gasket failing and causing concrete tube syndrome from overheating under my intake. It was part of the bypass system for the heater core. It cause some back pressure and leaking in several issues. We also found the water pump job from the previous owner to be pretty shotty.

While he was doing all of it he replaced my radiator, drive belt and tensioner, timing belt and water pump.
Cost me a pretty penny but she drives better than ever before and I’ll get another 20 years!

Sorry I haven’t been on in a long time. I’m glad to see everyone is still here.