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What are the reasons a 98 silverado loses heat?

(1998 Chevrolet 1500 Pickup)
in Moberly, MO on January 15, 2012
Just recently my truck lost heat. I have checked and tested about everything possible and replaced a couple parts and still have no heat. At first i was told the switch was bad but it has a new one and i still dont understand why i have no heat. The blower motor, resister, fuses, switch and hoses and things are fine. Before it quit i had to leave heat on high and if i turned it down or off i couldnt get it back on.
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Popular Answer
on January 23, 2012
It is possible that the heater core is clogged.
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