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I have a 1988 Buick leaders limited .What causes it to overheat after half hour

(1990 Buick LeSabre)
in Philadelphia, PA on November 05, 2014
I recently changed thermostat and the radiator and water pump seem to be working seem to be working fine.
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on November 05, 2014
Radiator cooling fan(s) working properly??
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on November 05, 2014
I believe so.the fan spins when it starts getting hot
on November 05, 2014
That really doesn't mean they're working properly!... May not be running on high speed... This will have to be tested using equipment you do not have.. Suggest having it tested by a mechanic with a real scanner to test fan functionality!!
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