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My mazda 2005 overheat but if i put high rpm like 3000 the temp. go to normal i allready change the termostat and water pump

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Sounds like you need a new water pump. When you turn the engine at high rpm's then the pump is pumping faster and circulating the water. But isn't circulating the water good enough at lower rpm's

Posted on Sep 16, 2010

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Thought I answered this one already. but here's the short version. Yes , change the t stat after servicing wp. They become unreliable after any high temps (above normal). Check the electric fan, and the mechanical fan to make sure both are working properly. If all else fails. remove radiator and back flush. often overheat or high temps can loosen block rust and obstruct part of the radiator core.
When re-filling, turn heater on high to eliminate air pockets in system.
Good luck with it
If you need more info, just ask!

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