Heater not working properly

1997 CADILLAC DEVILLE
220,234 MILES • 4.6L • V8 • 2WD • AUTOMATIC
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REARDRIVE
  • MEMBER
  • 93 POSTS
What cause my heater to run awhile cut off awhile and back on? ( on and off)
Jan 15, 2019 at 11:17 PM
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SCGRANTURISMO
  • ✓Experienced Mechanic
  • 4,897 POSTS
Hi Reardrive, my name is Alex and I will be helping you today. This sound like a loose connection to me. You might want to check the ground connection where I circled on this wiring diagram. I also am sending a couple of links on how to test the ground as well. Thank you and I hope this helps.

https://www.2carpros.com/articles/how-to-use-a-voltmeter
https://www.2carpros.com/articles/how-to-check-wiring
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Jan 15, 2019 at 11:39 PM
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