My 2000 mazda mpv is blowing air into the coolant tank at high revs. removed the thermostat and radiator was cleaned but there is no change

I've owned my 2000 MPV since new and in that time and 250K miles later I have replaced the radiator and water pump and overflow tank. I have never bleed the cooling system. I have encountered no cooling related problem. I live in south Florida.

Besides that is usually the case

Have to draw out with turkey baster or remove
the degas bottle & wash out if that is what you want

Changing the coolant has nothing to do with no heat

The thermostat may be stuck open or you have a coolant
valve in the heater system to check out or hvac doors under
the dash that hang up

Nornally the hose will warm up but not hot with a circulating system. the therostae could be installed upside down or be bad. You should install a therostate with a asprin holding it open to circulate the coolant till the cooling system is full and the asprim will disolve as it soaks in the coolant. the air will ciculatre to the top and out and the systrem will be full. the stat will work corectly after the asprim is gone. with air around the stast it might not open and therefore overheat.

Air lock in cooling system not allowing coolant to circulate through heater core. Need to bleed air or burp air from cooling system. Look for a bleeder valve by the engine side of the upper radiator hose possibly or on radiator.

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The coolant system has to be bled

possible head gasket do a preasure test on the coolant system to see if it loses any coolant or presure drops and check for leaks hope this helps

You probably never cleaned the cooling system out.

If you have not get it done by pros.

It seems something is blocking the flow. If the water pump went bad you will know. Rarely ever heard a impeller breaks off like you think. The bearings and the seal break first.

Check and see also if the heater valve is working.

As for the over heating even new thermostats fail. Reverse flush is needed or the procan measure the pressure in the radiator cooling system and edetermine if there is a engine pressure problem. Tools and experience is the key in the game of diagnosis.







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If changing the thermostat didn't work, have the heater control valve checked, it may not be opening all the way to let the coolant circulate thru the heater core fully.

i had the same thing on my wifes 2000 mpv van...the ends of the radiator are made of some sort of composite type material....it had a slight crack in it....wasn't obvious until it got worse and started streaming water from it when warmed up....even after it cooled enough not to be spewing it was hard to actually see the crack though a few inches long....was hard to even see where the water and antifreeze mixture was coming from until i took out the radiator

check radiator fan and radiator if its ok cylender head problem after repair it .