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
Avatar
LARRY M HARRISON
  • MEMBER
  • 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 12:05 PM
Advertisement
Avatar
ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
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 21, 2021 at 10:14 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle