LOCATION OF THE SECONDARY LOW VOLTAGE SENDING UNIT TO THE COOLING FANS?

  • Tiny
  • Jessi12
  • 2001 PONTIAC GRAND AM
  • 3.4L
  • V6
  • AUTOMATIC
  • 179,000 MILES

My car was overheating so my father replaced the intake manifold gasket. But that's not what caused it to overheat. So now he's trying to get my cooling fans working because they don't click on when there suppose to. But he can't find the location of the sending units. Where would they be or what do I replace to get the fans working again? Could this be causing the engine to overheat? Is there any other electrical work that needs to be done to fix the fans?

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Tuesday, May 27th, 2014 AT 5:28 PM

8 Replies

  • Tiny
  • Jacobandnickolas
  • EXPERT
  • 68,402 POSTS

Does the engine overheat when it is driven at highway speeds? Also, have you checked the fan relays under the hood in the relay box?

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Tuesday, May 27th, 2014 AT 6:36 PM
  • Tiny
  • Jessi12
  • MEMBER

It drives normal on highway. When I start stopping n going is when the temperature rises. The fuses n relays seem fine.

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Tuesday, May 27th, 2014 AT 7:45 PM
  • Tiny
  • Jacobandnickolas
  • EXPERT
  • 68,402 POSTS

If the relays, fuses, and fan motors are good, then there is either a problem with the wiring or the temp sensor.

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Wednesday, May 28th, 2014 AT 5:27 AM
  • Tiny
  • Jessi12
  • MEMBER

Is there a sending unit to the fans?

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Wednesday, May 28th, 2014 AT 5:36 AM
  • Tiny
  • Jacobandnickolas
  • EXPERT
  • 68,402 POSTS

If I remember correctly, in 2001, there was a temp sensor that was read by the PCM. When a certain temp was reached, the PCM sent power to the fan relay and that, in turn, sent power to the fan motor.

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Wednesday, May 28th, 2014 AT 8:45 AM
  • Tiny
  • Jessi12
  • MEMBER

Ok thanks. Hopefully this works.

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Wednesday, May 28th, 2014 AT 3:28 PM
  • Tiny
  • Jessi12
  • MEMBER

Do you know where the temp sensor is located? We're hoping we don't have to break down the engine again.

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Wednesday, May 28th, 2014 AT 3:44 PM
  • Tiny
  • Jacobandnickolas
  • EXPERT
  • 68,402 POSTS

I believe it is on the intake near the thermostat housing.

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Wednesday, May 28th, 2014 AT 5:49 PM

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