Question about 1999 Chevrolet Silverado 1500

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Heater only blows out luke warm air no antifreeze smell and not low on level

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I just had the same problem with my 1999 Silverado.I had a clog in my heater core,so I back flushed the heater core and then ran water throught the otherway.It worked and then replaced the cabin filters and now I get lots of heat.Be very careful removing the heater hoses because they have plastic connectors from the heater hose to the heater core.I ended up replacining the white connector.

Posted on Nov 15, 2009

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Start the motor and let run idle for a few minutes. then feel the side reservior of the radiator. if it feels overly hot then you need a new thermostat if not real hot then there is an air routing problem under the dash panel. you should have it checked out by a pro...

Posted on Nov 15, 2009

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Usually the most common issue is from the thermostat being bad. if you have recently done a radiator flush using chemicals, leaving the mixture in the system to long can cause the thermostat to go bad. next would be a plugged heater core only if you have not maintained your system. I am not completely familiar with this year & model but one other thing to consider may be electrical or vacuum line connections up under the dash which controls how much heat you get. hope this helps

Posted on Nov 15, 2009

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