Question about 2000 Chevrolet Silverado 1500

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Heat works poorly on fan 1 and 2 and no heat 3,4,5 fan speed

Hey,
Im thinking it is going to be a heater core or a mixing vale problem but trying to decide which. any way to figure out which??

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My truck did the same thing. i unhooked the two heater core hoses, and then back flushed the heater core with a garden hose. seems to work pretty good so far

Posted on Nov 11, 2008

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