Heater blows cold air

2004 CHEVROLET TAHOE
1,800,000 MILES • 5.3L • 4 CYL • 4WD • AUTOMATIC
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JRBACA
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  • 1 POST
First the truck overheated then i topped it off with antifreeze then it did not overheat, but the gauge would drop toward cold temperature and the heater would blow but only cold air.
Dec 7, 2016 at 11:36 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
it is probably still low that is number one cause of no heat. have coolant system pressure checked for head gaskets.
Dec 7, 2016 at 12:10 PM
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RYAN L
  • ✓ASE Certified Mechanic
  • 272 POSTS
  • ASE Certified Mechanic
Thank you for using 2CarPros! Here is a great video on what could be wrong with your heater! https://www.youtube.com/watch?v=SNRb6pSwYuU

If you have any further questions please feel free to ask!
Dec 7, 2016 at 3:16 PM
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