Heater core flush


Asked by Dec 14, 2014 at 09:08 AM about the 2003 Cadillac Seville STS FWD

Question type: Maintenance & Repair

Has anyone flushed the heater core on a Seville? How hard is it to do? Looks to me that
the hoses into the firewall are hard to reach, because the A/C hoses are right above
them. Any tips?

2 Answers


If the hoses are easier to access on the water pump inlet you could flush the heater core using the hoses. Once the heater hoses are disconnected, run a garden hose to one of the lines and run fresh water through the heater core until clean water comes out the other hose. You could leave the hoses intact and buy a system flush kit. They are fairly inexpensive and this will flush the entire cooling system.

Best Answer Mark helpful

I can see one of the hoses already and it does look easier to access. I can't wait to have some heat again. Thank you.

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