2001 Mazda Millenia Cooling System question

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2 weeks 4 hours ago #203713 by mattmontalto
2001 Mazda Millenia Cooling System question was created by mattmontalto
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)

Matt Montalto

Matt Montalto
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1 week 4 days ago #203757 by college man
Replied by college man on topic 2001 Mazda Millenia Cooling System question
I take it the funnel is in the radiator fill port? That should be the point of air release. With the car hot and idling the coolant
fan must cycle. I like to see it come on twice.


www.ericthecarguy.com/faq/what-to-do-whe...ling-system-problems

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1 week 1 hour ago #203772 by mattmontalto
Replied by mattmontalto on topic 2001 Mazda Millenia Cooling System question
sorry for the delay in response (I never got notified via email of your reply)....

...my radiator does not have a port with a cap on it.... Mazda calles the cap on the reservoir the radiator cap (which is a pressure cap) and the other cap Mazda calls the coolant inlet port... this is on the engine right above the water pump and connected to the radiator top hose.....

I have tried bleeding from both ports and I still have the overheat condition.... my fans come on, but never seem to cycle off.... as I write this I have a feeling that the problem may be that the radiator fan is not cycling to its "high" speed....unfortunately the Mazda service manuel I have has such lousey info on how the system should be operating and how to actually confirm its turing up to high when its supposed to,.... thank you for getting back though... really appreciate it

Matt Montalto

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6 days 2 hours ago #203775 by college man
Replied by college man on topic 2001 Mazda Millenia Cooling System question
try this method. start around 12 minutes




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