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2003 Silverado 5.3 heater core install

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Old December 14th, 2009, 12:05 PM
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Default 2003 Silverado 5.3 heater core install

I am having heating issues - not very hot, thinking about flushing system first but wanted to know if anyone is having similar problems on a 2003 model - 110k miles, and should I be looking at replacing the core. I smelled fluid once last week for first time and have not checked hoses to see if one's hot and the other is cold as of yet.
Old December 14th, 2009, 4:36 PM
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i'd be looking at your thermostat befor you sart doing all of that..
Old December 15th, 2009, 9:24 AM
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Default Heater Core install

Thanks - I already flushed the system, replaced hoses & thermostat last summer, but in Phoenix - we do not need the heat as much - and just now starting to see a problem.
Old December 15th, 2009, 11:55 AM
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well i have replced a thermostat and a week later i had to replace it again.. and thats on different cars..... and thats happened a few times.. would u rather spend $5-10 or 100+?
Old December 16th, 2009, 8:50 AM
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Good advice! - I'll replace the thermostate & do a flush, hope this will fix it. Thanks.
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