Question about 1999 Daewoo Lanos

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2000 Daewoo Lanos engine fans run constantly

The coolant temp. sensor was replaced and it didn't help. Also, it gives error code 1637 and I have no idea what it means. Does anyone know about these cars?

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  • mikec27 Jan 08, 2009

    The switch is between the intake and exhaust manifolds, not on the radiator. You must be thinking of another Daewoo.

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Which temp sensor did you replace the one with one wire is for the gauge on the dash and the one with two wires is for the ecu the ecu controls the cooling fans so if this sensor is faulty the ecu will switch the cooling fans on because it does not know what temperature the engine is at check you have rplaced the right sensor

Posted on Dec 20, 2009

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The new switch could be faulty un plug it from the side of the radatior if the fan stops it was the switch if it dont the wires in the loom could be fused you need to see an auto eletrition

Posted on Jan 06, 2009

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Get the coolant pressure tested, its definitely leaking coolant. You will need to get the coolant running line.


Pressure test will help you to know from where exactly coolant/refrigerant is getting leaked.

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Gs300 coolant is bubbling in resevoir,but temp is fine ?


Get coolant temp sensor checked.

Get the coolant pressure tested, its definitely leaking coolant. You will need to get the coolant running line.


Pressure test will help you to know from where exactly coolant/refrigerant is getting leaked.

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For complete step by step troubleshooting i suggest you to go through the help links mentioned below :----

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http://schematicsdiagram.blogspot.com/2012/01/coolant-enters-in-transmission-on.html

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