Just did oil change, noticed trans. cooling lines leaking at the rubber metal compression ends, decided to change them. That is all done but I am still finding the antifreeze overflow low. I add a 1/2 a quart of antifreeze everytime I check the motor oil level. Why am I down on antifreeze? Water pump was changed about a year ago. They needed to change a plastic cracked piece next to the water pump as well. They said they replaced it with a metal one. Not sure what this metal piece is but it was leaking antifreeze. New pump, no leaks I can find but the overflow is low.... Not sure why? Any suggestions? Thanks

 

Buicks had a problem with the intake plenum leaking anti freeze into the cyls. You cannot see it , but it gets burned off through the exhaust until it gets bad enough. I would suggest you either invest in a cooling system pressure tester or have the cooling system pressure tested at a reliable shop and see if it holds or loses the pressure. Depending on those results will determine your next move.

 

Great advice, also could be a faulty head gasket and leaking directly into cylinder(s). Exhaust will actually have a sweet (antifreeze) smell vaporized. Can't vouch for the new orange stuff being non-poison, what or if that is tell-tale as such. This happened twice on my Daytona Turbo Z (obsolete car). This post is back to 2011 lmao.