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Power door locks not working properly

Tiny
CHAPPYSDAD
  • MEMBER
  • 2008 CHEVROLET COBALT
  • 2.2L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
When I manually operate the electric door locks they will intermittently unlock the first time but they all four get weaker if I try to consecutively unlock the doors. If I let them all sit for 20 minutes they’ll usually unlock at least once and then back to weak or failing opening. If the A/C is running they will not unlock.
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Sunday, May 24th, 2020 AT 7:49 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

That sounds like a low voltage issue. Are there any other issues with the electrical system? Have you had the alternator and battery tested? Most parts stores will do it for free, or here are two links that explain how to load test a battery at home and how to test an alternator at home. I'm suggesting this first simply because it gets weaker and more power is requested and doesn't work when the electrical draw by the AC is added.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

https://www.2carpros.com/articles/car-battery-load-test

Let me know.

Joe
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Sunday, May 24th, 2020 AT 9:04 PM

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