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2000 Ford Taurus Momentary 200 RPM idle increase

Tiny
KENLOVESJENN
  • MEMBER
  • 2000 FORD TAURUS
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 16,000 MILES
With the heating/cooling fan on, idle surges by just under 200rpm every 3 seconds. Fan only works when speed selector switch is in highest speed setting. I pulled switch to attempt repair, it looks like it got hot at some point. I'm pretty sure the rpm surge didn't start as soon as I lost other speed settings, but I guess I'm not 100% on that.
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Thursday, May 20th, 2010 AT 8:56 PM

3 Replies

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Check AC system if low as if maybe the AC compressor engaging and disengaging
that will cause the RPM to flex up and down

as for the fan
suspect, check and replace blower motor speed control resister located beside blower motor at the passenger side
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Thursday, May 20th, 2010 AT 9:54 PM
Tiny
KENLOVESJENN
  • MEMBER
  • 7 POSTS
Yeah, AC system is definitely low. Today as I was driving, I started to smell a horrible burning - it was the AC compressor. Guess I'll replace it and charge the system. As for the resistor - is that what probably took out the fan speed switch? Is it as easily tested as, say, a 5k ohm resistor in a circuit - just measure resistance? Does it say what the resistance should be? And, finally, is it accessed through the engine compartment at the firewall as I would assume? Thank you very much for your response!
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Tuesday, May 25th, 2010 AT 10:15 PM
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Blower ResistorIn located dash, below center of glove box it about $30 or less easy to replace
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Wednesday, May 26th, 2010 AT 6:02 AM

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