[CowBoE]

There is a metal outlet that looks like it should have a rubber hose attached to it.
Well, I can't find any nearby rubber hose. Could engine dispense coolant through this when PCV valve hose is unplugged?

know

 

[new echo owner]

Coolant block drain! Not suppose to have anything on that!

 

[CowBoE]

Coolant block drain! Not suppose to have anything on that!

Cool. So is that only used to drain the coolant out of engine block?

Could it spew out coolant in some condition?

Because it looks like coolant may have spewed out of that and onto the hot exhaust that cause lots of white smoke...when the PCV hose was disconnected.
White smoke immediately stopped once the PCV hose was plugged back in.

 

[new echo owner]

Yep, that is for draining the block if you want to change the coolant!

Don't usually, unless someone had loosen it up, cauing it to leak!

No direct connection between that and the PCV!
When did that happen? The white smoke came out from the drain valve?
Why did you disconnect the PCV hose? Were you having some issue that you are looking for cause?

 

[CowBoE]

Yep, that is for draining the block if you want to change the coolant!

Don't usually, unless someone had loosen it up, cauing it to leak!

No direct connection between that and the PCV!
When did that happen? The white smoke came out from the drain valve?
Why did you disconnect the PCV hose? Were you having some issue that you are looking for cause?

I was replacing valve cover gaskets, and during that time, I also did...

• replaced spark plugs
• replace fuel injector o-rings
• cleaned intake carbon build up
• replace PCV valve

and while installing everything back the PCV hose on the intake manifold side came loose and got disconnected.
Since intake manifold side of the hose is not visible, I didn't catch it immediately,
but eventually reached in their with my fingers and confirmed that hose was pulled out.

I believe the PCV hose being dislodged did directly impacted some coolant getting spewed onto the exhaust,
because as soon as I plugged in the PCV hose, the white smoke stopped near instantly.

 

[new echo owner]

Actually, I suspect maybe there is some sort of leak in the front valve cover area, when you reconnect the PCV hose, the vacuum in the crankcase haulted whatever smoke that was. Blowby maybe?
The cooling system is under pressure all the time when the engine is hot, if it was spilling coolant before it wouldn't have stop just because the PCV hose was reconnected.