Hello All…. Once again I find myself in need of some pro advice on matter involving this 2001 Mazda Millenia 2.5L. This time the matter is the cooling system.
For starters, this cooling system is not very familiar to me as it has a pressurized coolant reservoir instead of a regular cap on the radiator. Because of this, I have found it impossible to find any good advice on the internet on how to properly bleed the air out of this system.
Initially I had any issue with the heater core, so I disconnected it and flushed it out and reconnected it and while I was doing that I drained the whole system and changed the thermostat (with and OEM thermostat directly from Mazda). I refilled the system and have made a few attempts to get all the air out of the system (burping it by squeezing the hoses and running it with cap off the coolant inlet… which is the one the high side hose connects to… not the reservoir)…. and the car seems to maintain temp when driving… and even when sitting idle in the driveway…. but when I took it on the road this weekend, it was fine while driving … but if I was stopped at a light for too long it would get close to the red….
The high hoses obviously is hot as well as the bypass hoses, but the lower hose never seems to get above feeling warm….
Can someone give me some info on the proper way to make sure I have all of the air out of the system? And, from the sound of this issue, does anyone think that the issue could be that the radiator need to be flushed? I know that the radiator is not original and had been changed at some point prior to my owning the car….
Thank you for any help anyone can offer…. really appreciate it…
Attached is a picture of this engine (in the picture the yellow funnel is in the coolant inlet (as Mazda calls it)…. I was running the engine and watching for all the air bubbles to come out)
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