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Stalls when engine reaches operating temperature

Tiny
GRUCKER7
  • MEMBER
  • 2000 BUICK CENTURY
  • 3.1L
  • V6
  • 2WD
  • AUTOMATIC
  • 122,000 MILES
When car gets to operating temperature and fans get ready to come on the car will stall. No codes are present no mil light on.
Friday, August 24th, 2018 AT 8:53 AM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

Does it start right back up?

I would check the battery and make sure it can handle the load.

The fan motors themselves may be drawing too much current.

Roy

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

https://www.2carpros.com/articles/how-an-electric-cooling-fan-works

https://www.2carpros.com/articles/replace-electric-fan-motor
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Friday, August 24th, 2018 AT 9:11 AM
Tiny
GRUCKER7
  • MEMBER
  • 3 POSTS
Yes, starts right back up but will stall again until I rev engine high enough then it will hiccup and fan will run and car will stay on.
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Friday, August 24th, 2018 AT 9:56 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, when the engine is cold and the fans are not working, do you still have the same issue?
When it is hot, disconnect the fans and see if it still happens.

Roy
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Friday, August 24th, 2018 AT 9:58 AM
Tiny
GRUCKER7
  • MEMBER
  • 3 POSTS
I see this stalling when fans come on is a common problem on this site. What did the other people do to fix it?
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Friday, August 24th, 2018 AT 7:46 PM
Tiny
GRUCKER7
  • MEMBER
  • 3 POSTS
I am going to disconnect fans, but I was hoping you guys could look in your data base because a lot of people have the same problem and what did they do to fix it.
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Saturday, August 25th, 2018 AT 9:43 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,722 POSTS
I have seen the engine coolant temperature sensor short out when hot. I would try to change the sensor to see what happens. Here is a guide to give you step by step what to do and the location of the sensor below:

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

Check out the diagrams (below). Please let us know what happens.

Cheers, Ken
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Saturday, August 25th, 2018 AT 1:18 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Just to add what Ken said, try disconnecting the fans and see if it still stalls.

Every car is different with there issues and solutions. The most common is the voltage spike from the current draw from the fans creates low voltage to the PCM.

That is why I asked you to do those tests.

Roy
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Saturday, August 25th, 2018 AT 3:06 PM
Tiny
GRUCKER7
  • MEMBER
  • 3 POSTS
Ken, when I install both computers what is program procedure and which is programmed first. I think you guys sent the wrong BCM with this part #09380717?
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Thursday, August 30th, 2018 AT 4:48 PM
Tiny
GRUCKER7
  • MEMBER
  • 3 POSTS
Where is the right BCM for my car, it should have been here by now? 2000 Buick Century 3.1L.
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Wednesday, September 5th, 2018 AT 7:49 PM

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