[Sprinter]

Looks like I'm a bit late today, both Pete and Andy have mentioned not releasing pressure cap when coolant is hot. When coolant is cold there is no pressure to release - at least none that I've ever noticed on a fairly long list of cars through the ages.


Tess, relax today. Let it cool down overnight. Check level in morning before starting engine. If way too high you could try to remove some (PLEASE do not stick a pipe in there and suck it out) until it is on the seam. Then go out for a decent 50 mile drive with the hood down. Have a llok at the level when you get back but do not touch the cap. Next morning (or after at least 2 hours) check it properly and hopefully all will be OK.

Tess, abject apologies if any of that sounds/reads patronising - defo not intended, just a problem with written rather than spoken word.

 

[Sprinter]

I have removed my cap loads recently and when system is cold, I have never had a pressure release when removing the cap. I assumed this was normal Tess. Can someone confirm this?

When coolant is cold there is no pressure to release - at least none that I've ever noticed on a fairly long list of cars through the ages.

I cannot confirm that but repeat my belief based on owning cars for more than 30 years - no heat, no pressure. Very minor hiss when removing cap but nothing like the release of pressure from a system at normal operating temperature.