After replacing the heater core it hesitates and smokes after running for a awhile?

2002 MERCURY SABLE
164,000 MILES • 3.0L • V6 • 2WD • AUTOMATIC
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LARRY M HARRISON
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  • 1 POST
The car listed above is a GS model. I changed heater core and assembly now it hesitates and smokes when running awhile on the side the water pump on.
Mar 21, 2021 at 7:05 PM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
Good morning,

Check the hoses for leaks around the heater core are. You need to pressure test the system.

https://www.2carpros.com/articles/radiator-pressure-test

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

I attached a YouTube video of the heater core procedure below.

https://www.youtube.com/watch?v=iqCQpsGY49I

Roy
Mar 22, 2021 at 5:14 AM
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