Question about 1999 Chevrolet Silverado 1500
Check the valve on the upper heater hose and make sure it moves,if it does then you need to have the heater core flushed.You can do it your self by removeing the heater core hoses from the heater core and runnin water through it with a garden hose but a rad shop can do a better job.If you choose to do it yourself pick up a bottle of rad cleaner first and put it in the rad a few days before you flush it.
Posted on Nov 16, 2009
More than likely your heater core is stopped up if you undo the two heater hoses and flush them with a water hose back and fourth till water is clear that should make it hot
Posted on Jan 02, 2010
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Posted on Jan 02, 2017
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