Cooling fans never turn on

Tiny
SREUBENW
  • MEMBER
  • 1999 OLDSMOBILE INTRIGUE
  • 3.8L
  • V6
  • AUTOMATIC
  • 137,000 MILES
Tested cooling fan motors they work, tested relays and fuses they work, changed the coolant temperature sensor and engine thermostat, flushed radiator and filled with new coolant. They do not come on with AC, have not yet tried disconnecting coolant temperature sensor, starting to run out of options might have to take it to a shop because I feel like I am chasing a gremlin.
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Friday, December 29th, 2017 AT 10:16 AM

7 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good morning

remove the connector from the coolant temp sensor for the computer with the engine running. The fans should both come on.

Let me know the results

Roy
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Sunday, December 31st, 2017 AT 6:56 AM
Tiny
SREUBENW
  • MEMBER
Just did the test(twice), both fans did come on both times, im not exactly an expert so what is the purpose of this test?
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Tuesday, January 2nd, 2018 AT 12:27 PM
Tiny
ASEMASTER6371
  • EXPERT
Checks the complete circuit for the fans.

This indicates either a bad coolant sensor, bad connector or a thermostat issue such as stuck open.

Roy
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Tuesday, January 2nd, 2018 AT 12:49 PM
Tiny
SREUBENW
  • MEMBER
Thank you for the help, local auto parts store wants 40 some odd dollars for the correct connector.
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Tuesday, January 2nd, 2018 AT 6:37 PM
Tiny
ASEMASTER6371
  • EXPERT
Shop around. That is too much for a connector.

Roy
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Tuesday, January 2nd, 2018 AT 6:40 PM
Tiny
SREUBENW
  • MEMBER
Turns out the gm 3800 engines just run hot commonly hangs out around the halfway mark, the reason the coolant tempature sensor light came on was due to the coolant level sensor reading improper so says Mr. Mechanic dissent exactly make sense to me but cars working good, hope my experience helps somebody, and Thank you everybody for your helpful input
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Saturday, January 27th, 2018 AT 1:48 PM
Tiny
ASEMASTER6371
  • EXPERT
Your welcome

Roy
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Saturday, January 27th, 2018 AT 1:57 PM

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