Heater not getting hot

2008 CHEVROLET COBALT
34,687 MILES • AUTOMATIC
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FRANCES RODRIGUEZ
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  • 1 POST
I need help with my heater it doesn't get hot. I have checked the coolant. I have changed the thermostat. I did a flush of the heater core. I don't know what else to do. can you please help me?
Jan 12, 2020 at 1:20 AM
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TOUGHDIVER
  • CERTIFIED EXPERT
  • 224 POSTS
Hi,

It could be the heater core is clogged a good way of telling is to warm up the motor and with the engine not running locate the heater hoses under the hood rear the engine where they go through and into the car. Being very careful not to get burnt check the hoses they should both be hot. If only one is hot the heater core is clogged with debris try to flush the heater core (careful depressurize the cooling system first antifreeze can severely burn you) by removing the hoses and forcing water through the heater core with a garden hose. If you can't get water to flow freely the heater will need replaced. If they are both hot you have problem with the heater controls inside the car. I'm attaching repair guides and video below on the heating system for you to reference, let us know if this was helpful and what fixed the vehicle.

https://www.2carpros.com/articles/engine-cooling-system

https://www.2carpros.com/articles/car-heater-not-working

https://www.2carpros.com/articles/replace-heater-core

https://youtu.be/dcL_0TWeZJY

https://youtu.be/D_RaAsxQ1sg

https://youtu.be/M9SIafVsqyc
Jan 12, 2020 at 2:22 PM