How do you bleed air from the cooling system of a Mazda MPV?

Answer 1

It is a BAD problem since until the bubble is cleared, the engine will continue to boil over an spew coolant. If you don't have time to heat and cool the engine several times, thus allowing for uptake from the reservoir, you must apply immediate action. PLUS for some reason the bigger block v6 Mazdas have a tendency to rust up real bad and clog the heater core.

So here is my solution.

1. Put a large clean pan under the radiator plug and drain coolant. You will reuse since it is now $12 a gallon.

2. Remove radiator cap and cut the heater hose a few inches from the firewall or valve on the passenger side. Permanently Install a Tshaped flush fitting.

3. Re-install radiator drain plug and attach garden hose to flush fitting. Put a rag or drain spout on the open radiator.

4. Run the engine and flush via the garden hose until water runs clean.

5. put at least 4 ounces powdered oxalic acid or liquid phosphoric acid into the radiator and replace cap. Put cap on flush tee. Run engine at least 5 minutes after approaching normal heating range.

6. Repeat steps 4 and 5 as necessary.

7. After the last flush add 6 tablespoons bicarbonate of soda run for 5 minutes then flush to clear water.

8. Filter and refill with original coolant. Top off with fresh antifreeze/water.

9. carefully open lid on flush Tee to bleed air out of system.

NEVER use lye, sodium hydroxide, easy off oven cleaner, Drano etc. These lye based products will MELT aluminum.