Question about 1999 Chevrolet Silverado 1500

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1999 chevy silverado the heater doesn't put out heat. the engine temp comes up to 190 degrees and the fan works but no heat

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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

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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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1 Answer

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If the heater valve operate properly then the line to the heater core is plug.
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Try replacing the thermostat for a couple bucks and a twenty minute fix. You could also try unhooking the heater hoses to check if there is crud holding back the water, which you can also check the temperature of. Before you do anything, get a good manual like a Chilton or Haynes for your truck that will guide you through the troubleshooting and the repair if needed.

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