Hello! Posting on behalf of my uncle whose had a longstanding issue with his Mazda 6 2.2 diesel, though we suspect the issue is fairly applicable to any water cooled engine and that some of you might know what's going on.
The main symptom is a water sloshing noise mostly at startup, but also under heavy load.
Since a dealer repair years ago where he suspects they didn't properly bleed and overfilled the coolant, there was a blow out a while back and he has replaced a coolant pipe near the front, which was suspiciously succeeded by a new, metal part from Mazda versus the original - seems like a weak point in the cooling system. Unless it's designed to give out before more damage.
He has drained, refilled it with the proper dealer fluid FL22, green stuff, and bled it following the usual methods, and then following along with a very particular process online done by other Mazda owners - seems like bleeding it isn't solving the issue. Although the car does get up to temp, and the heater he says is much hotter than in recent years after that.
The video I've attached shows a strange, constant air bubble stream... do any of you know what else could cause this? It holds its coolant so you'd think any big opening letting air in, would also be dripping the fluid out in a short-enough interval?
My personal next step for him is to order that UV dye stuff designed to go in the coolant, and then we look all around the engine bay to find if it is leaking out as such... but is there a better, more logical thing to check or cause of this in your experience?
The main symptom is a water sloshing noise mostly at startup, but also under heavy load.
Since a dealer repair years ago where he suspects they didn't properly bleed and overfilled the coolant, there was a blow out a while back and he has replaced a coolant pipe near the front, which was suspiciously succeeded by a new, metal part from Mazda versus the original - seems like a weak point in the cooling system. Unless it's designed to give out before more damage.
He has drained, refilled it with the proper dealer fluid FL22, green stuff, and bled it following the usual methods, and then following along with a very particular process online done by other Mazda owners - seems like bleeding it isn't solving the issue. Although the car does get up to temp, and the heater he says is much hotter than in recent years after that.
The video I've attached shows a strange, constant air bubble stream... do any of you know what else could cause this? It holds its coolant so you'd think any big opening letting air in, would also be dripping the fluid out in a short-enough interval?
My personal next step for him is to order that UV dye stuff designed to go in the coolant, and then we look all around the engine bay to find if it is leaking out as such... but is there a better, more logical thing to check or cause of this in your experience?
thanks
