Anyone know?

 

It makes it work more reliably, and last longer.

Under ideal conditions they can freeze during operation. More importantly it keeps condensation from settling in the PVC. The resulting pool of water would freeze.

The condensation remaining in the valve above the freezing point would cause the valve to fail prematurely due to 'rusting/corrosion/failing spring' of the one-way valve mechanism.

 

Cool - Thanks!

 

It can happen. I've heard of light aircraft that actually crashed due to lack of engine power caused as a result of an iced-up PCV valve. Once the crankcase presure builds up enough it will force oil into the combustion chamber. I experianced this with a garden tiller once. The clog was caused by a hornets nest rather than ice, though.

 

I asked that a while back. Come to find out that it's a heat sink and not a grounding strap.

God only knows why GM thinks the PCV valve would freeze ever up. Maybe just worried about condensation freezing somehow in it.