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How to flush the heater core?

Tiny
SKIPPY-JACK
  • MEMBER
  • PONTIAC GRAND PRIX
I have a 2003 grand prix which was recalled, and the dealer added some kind of pellets to the coolant. Now I have no heat and it feels like there is gravel in the heater hoses that run to the heater core. The pellets were added a couple of years ago. How do I flush the heater core?
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Saturday, January 13th, 2007 AT 9:06 AM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

There are a few reasons why the heater might not work.
It could be due to low coolant, clog in the heater core, the engine not warming up properly, faulty blend door actuator.

Take a look at this helpful guide:

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

Here is a guide on how to flush the cooling system:

https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars

Please take a look at these guides and let me know if you have any questions.
Thank you.
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Friday, January 14th, 2022 AT 2:13 PM

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