Question about 1994 Mazda 323

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Overheating and leaking when i try to look if radiator has water it leaks from somewhere underneath

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There is a plastic bottle located beside the radiator with a hose that runs down beside the radiator, this is the reservoir for coolant and has this overflow feature. For car overheating it could be one of three things, thermostat stuck closed, hoses closing together (squeeze the hoses with your hand, if they are soft they need to be replaced) or your water pump is not working.

Posted on Sep 12, 2010

  • goggomobil Sep 13, 2010

    You can crudely test a water pump by turning the heater on high and the fan also on high (after the engine has warmed up). If the air coming out is anything less than hot, suspect the water pump. If the coolant is leaking from the water pump around and below the fan belt area (on the left side of the engine), the pump must be replaced. On the 323, this is a fairly difficult repair for a novice to attempt.

    Listen for the radiator cooling fan(s). They should come on when the engine is hot or if you turn on the defroster or air conditioner. If they don't come on and this overheating problem came on suddenly, the coolant temperature sending unit isn't functioning properly or the fan has failed. Some cars have a separate sending unit for the computer, apart from the gauge sending unit.

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