I don't know if this is a wise move or not, but being aware of the potential issue (this being my first Redblock Volvo, my approach is this: I installed a new plastic one when I went through the car upon purchase. And I will simply replace the valve each time I renew the coolant, that is to say every two years. Maybe that's overkill, but I figure it can't deteriorate that much in two years, and I've drained the coolant anyhow. Perhaps I'll push it out to every other coolant change, since I'm only putting 3 to 5k / year on the car. Cheap insurance, although it's not the most fun job, I'll admit.

For what it's worth, I went with the ProParts Sweden valve. No opinion on longevity, as I drive so little.


In my research, I did come across a (I believe) Ford part that could be used. I think it was half-metal, but it looked sturdy enough.