Question about 2002 Mazda 626

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It only gets hot when going speeds faster than 65 or 70 mph for 5 min or so. I can push in the clutch and coast and the temp gauge will start to climb rapidly let out on the clutch and cool back down. I understand what that does (letting the water in radiator cool without circulating)but never had a car go so fast to hot . I can idle and drive around town all day and never goes past center of fuel gauge

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  • flaherty620 Jul 25, 2009

    But the heater still works fine

  • flaherty620 Jul 25, 2009

    Yes I should of thought of that but it seems we always look over the easy stuff.... Thanks.....

  • flaherty620 Jul 25, 2009

    Yes I should of thought of that but it seems we always look over the easy stuff.... Thanks.....

  • flaherty620 Jul 25, 2009

    Yes I should of thought of that but it seems we always look over the easy stuff.... Thanks.....

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Hi

Your engine thermostat is stuck open and this is what is causing the problem. You will need to have a new thermostat fitted - Usual cost is between $15 to $30. Maybe less depending on thermostat type.

How the thermostat works is it remains in a closed position within the engines coolant circulating system to allow the engine to heat and reach its optimum operating temperature. The thermostat then opens to allow the coolant to circulate freely. When the thermostat becomes faulty it fails to respond to the temperature of the coolant. What has happened it that it has opened and is stuck in an open position allowing the water to circulate too freely around the engine - you will see a brief rise in temperature when the engine is worked hard but as soon as you come to rest the temperature falls back again as the thermostat is not closing when it should.

Solution - replace thermostat and all will be well!

Hope this helps. Please remember to rate my answer. Many Thanks.

Posted on Jul 25, 2009

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If you drive with the heater full on, what happens to the temperature then?

Posted on Jul 25, 2009

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