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1999 Mercury Sable Cooling fan/AC fan not working

Tiny
HAGANJE
  • MEMBER
  • 1999 MERCURY SABLE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 135,000 MILES
My cooling and AC fans will not kick on. Engine overheats but cools down while air moving through radiator so thermostat working fine. Both fan motors working correctly. Relay working fine. Replaced coolant temp sensor. Both fans still not turning on. Is there another "switch" or "sending unit" that I'm missing? I'm afraid it might be a faulty electrical wire. Any ideas?
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Tuesday, May 25th, 2010 AT 3:39 PM

3 Replies

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
There are 2 relays for the cooling fans, a low speed and high speed cooling fan relay. Have you tested both of these?
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Tuesday, May 25th, 2010 AT 4:35 PM
Tiny
HAGANJE
  • MEMBER
  • 1 POST
I switched around all three of the same size relay's in the engine compartment fuse panel. Did not have any effect.
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Tuesday, May 25th, 2010 AT 5:00 PM
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Ok, the a/c compressor switch is likely at fault then
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Tuesday, May 25th, 2010 AT 7:51 PM

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