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- 2017 CX9 GT AWD
Just had the engine in my 2017 GT replaced due to the coolant leak issue. After I got it back, I heard what sounds like water circulating under the passenger side dash area when the car first starts up. Didn't do this before the new engine was put in.
Some have suggested in another thread that the air was not purged from cooling system. I contacted the Mazda dealership about that and here's their reply:
The coolant idea does not sound terribly plausible to me, as you would not HEAR a coolant issue, you would feel it, cause you wouldn't get as good of heated air coming out your vents. Mostly likely cause is the HVAC drain system (which is right behind the passenger dash) got clogged and needs to be cleared. It did sit for a while, and we spray down the engine bay with water after replacement to try and get as much of the oil and coolant remnant off as we can. It is possible some extra water got in there and is not draining properly. It is more common on the older models, but not impossible to se on a '17. If you bring it in at some point we can get that checked out for you. Keep an eye out for water in the passenger floorboard, sometimes it overflows into the cabin filter/blower motor area.
I'm probably going to bring it in for further inspection, but interested if anyone has other thoughts on this.
Some have suggested in another thread that the air was not purged from cooling system. I contacted the Mazda dealership about that and here's their reply:
The coolant idea does not sound terribly plausible to me, as you would not HEAR a coolant issue, you would feel it, cause you wouldn't get as good of heated air coming out your vents. Mostly likely cause is the HVAC drain system (which is right behind the passenger dash) got clogged and needs to be cleared. It did sit for a while, and we spray down the engine bay with water after replacement to try and get as much of the oil and coolant remnant off as we can. It is possible some extra water got in there and is not draining properly. It is more common on the older models, but not impossible to se on a '17. If you bring it in at some point we can get that checked out for you. Keep an eye out for water in the passenger floorboard, sometimes it overflows into the cabin filter/blower motor area.
I'm probably going to bring it in for further inspection, but interested if anyone has other thoughts on this.