Question about 2003 Mazda MPV
There will be a sensor to activate the cooling fan possibly in the radiator. I would be looking at this
Posted on Jan 27, 2012
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Posted on Jan 02, 2017
have your thermostant checked frist, then coolant fan sensor, if every thing checks out good then have a block test done.
Posted on Oct 02, 2009
It could be the radiator is bad. There is a plug located on the bottom of the radiator. Unscrew the plug and let the fluid drain, you should be able to see if there is rust or gunk in the water/antifreeze. Then use a garden hose and put it in the hole used to fill the radiator and let the water run.
Posted on Aug 06, 2010
How hot did you run it before you replaced the water pump did you replace the thermostat also. If you ran it reline, blew your hoses, etc... you can have cracked head, warped head, cracked engine block.
Keep in mind rule of thumb if you replace the water pump you have to replace the thermostat also. REMOVE the thermostat and see if it is still over heating.....Even if you did replace it the one you got could have been bad.
I have the same vehicle in yard going to start tearing down tomorrow to check for issues.
If you can give me a better description of symptoms I can assist you in narrowing down the problem a little better the more info your provide the better to make a determination as to the steps you need to take to repair.
First is there water in your oil, second is there a thin film of oil in your water??
Again when the motor is running and up to normal temperature before it overheats is the engine pushing water out of of the over flow canister? If so this is a direct indication of blown head gaskets, or warped head/heads, or cracked head/heads from excessive over heating. It could become a very costly venture. Check for cost of repair versus ordering an engine, heads , etc... from www.usedengines.com. They have a very wide range of all types makes, models, etc.... and engine components and parts available for shipping.
Posted on Nov 17, 2010
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.
Posted on Jan 19, 2011
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