You either have air in the cooling system that needs to be bled out, or you have a head gasket leaking, allowing air to enter the cooling system from the cylinders. You can purchase a kit from most auto parts stores to check for exhaust gases in your coolant system.
SOURCE: 2001 Mazda MPV upper front oxygen sensor change
No you don't have to move any of that you need a "crow foot" type oxygen sensor it looks like a short brake line wrench that you can put a 3/8 ratchet on it with an extension. This will help you to get this sensor out. Good Luck
SOURCE: water pump replacement in a 2002 Mazda MPV
The reason is the water pump is driven off the timing belt, extra parts and allot more labor. No the eng does not have to be removed, labor time around 4 hours, parts about, about $125 US for parts, if it is a dealer add $75 US
SOURCE: Mazda MPV Coolant Loss (but no overheat)
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
SOURCE: i want to know if a universal coolant overflow can
ABSOLUTELY NOT!!!! The MPV reservoir is not an overflow but part of the pressurized system. Ever think it's weird the radiator cap is located on the reservoir?
SOURCE: my mazda mpv 2001 coolant leaking somewhere.
1. External Leaks
You need to get the vehicle to a mechanic to check all flexible coolant hoses, hose connections, around the exterior of the water pump and the entire radiator. To do properly the vehicle also needs to be on a hoist. If there is an external leak you should find coolant dripping from the front of the car while the engine is idling and the cooling system is fully pressurized. However it depends how bad the leak is and it's location.
2. Internal Leak
If coolant is leaking into the engine this is a serious problem and needs to be identified by a competent mechanic. For example, if you have a blown head gasket coolant will blow into the engine and contaminate the engine oil. If you check the oil in the engine's sump it should be completely free from coolant contamination.
You should also check the coolant in the radiator for any signs of oil contamination. If there is coolant in the oil then there will also likely be engine oil which has blown into the engines coolant passages and then mixed with the coolant.
IF you can find traces of coolant in your engine oil (or oil in the coolant) the likely problem
will be a blown head gasket and the head on the engine will need to be
removed and inspected .
Blown head gaskets are usually a result of an owner allowing the engine to overheat as a result of low coolant level, failed water pump or faulty thermostat. Overheating can also cause major damage to the head on the engine.
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