WHY WONT MY COOLANT FAN WORK

  • Tiny
  • gmason002
  • 1997 Mercury Sable
  • 200,000 miles

The car is a 97 motor 96. After the car sat for 3 yrs I did the engine swap. The was some mice damage noticed on the seatbeats. Coolant fans would work unless I unplugged the cts. I've replaced with new the ccrm, cts, temp. Sensor for the gage and thermastat. All new coolant w/ flush. The only things I haven't changed is the water pump and pcm. Any help would be greatly appreciated.

Monday, March 12th, 2012 AT 4:54 PM

5 Answers

  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

The fans would work only when the coolant reaches a certain temperature. Is the engine overheating and fans not coming on?
Do they come on when the A/C is turned on?

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Monday, March 12th, 2012 AT 6:01 PM
  • Tiny
  • gmason002
  • Member

They don't come on when the a/c is on and the temp gauge will sit at the top end of hot just below the red line. It hasn't boiled out any coolant. Before I changed engines the temp gauge never went above half way on normal.

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Monday, March 12th, 2012 AT 10:57 PM
  • Tiny
  • gmason002
  • Member

I had it running for about 45 mins at an idle. Reving up to 3500 rpms at times trying to get the fans to come on.

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Monday, March 12th, 2012 AT 11:01 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

Here are the cooling fan schematics.

Start by checking the fuses, relays and wiring connections.

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Tuesday, March 13th, 2012 AT 1:37 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

Oops

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Tuesday, March 13th, 2012 AT 1:38 PM

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