Question about 1997 Mazda 626

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97' Mazda 626 6cyl Overheating.

After discovering we bought a lemon we decided to make lemonade. Repairs that have been made: Spark Plugs (+Wires), Water Pump, Valve-Cover gasket, Head Gasket, Thermostat, Fan Motors, Flushed radiator.

Vehicle is still overheating after 1-2 hours of running, if we turn on heater it will postpone overheating for another hour.

Any suggestions?

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  • stevewallen5 Nov 11, 2008

    I have replaced the water pump, radiator, and the thermastat. It is still over heating. Could there be some blockage in the heater core or the block? There is no oil in the water or water in the oil. I have also burped the system to get all of the air out. What could be the problem?

  • joann_rocky Apr 02, 2009

    I have a mazda 1996 - 626 had the radiator replaced. But now when I run the car it will start steaming, and have to replace the coolant. The temp gauage will read normal.

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While you have it at the radiator repair shop, have them flow test the radiator. They should have information on the flow of a new radiator and then you can compare the two. They should be able to tell you if your flow rate is  high enough to do the job.

Posted on Oct 02, 2008

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Take the radiator to a radiator repair shop near you and have them acid bathe it and check it for leaks. It is possible that it could be full of stop leak.

Posted on Oct 01, 2008

  • rob_and_bett Nov 04, 2010

    have found original mazda water pumps and low quality replacements with impeller seperation resulting in increased clearance between impeller and water pump housings.
    it is very hard to detect unless directly compared. differences of as little as 1/8" clearance
    can decrease coolant flow enough to cause overheating.

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