1990 Lexus LS 400 fans & overheating

1990 LEXUS LS 400
71,833 MILES • V8
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NICKYNLONO
  • MEMBER
  • 6 POSTS
We pulled 3rd relay out to check front fans and nothing then put 3rd back in wiggled it and only right fan went on. Why didnt both fans go on and why didnt the twmperature go down? Please help? Any possibke suggestions to my problem?
Jan 26, 2014 at 10:49 AM
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MLDANIELS2000
  • ✓Experienced Mechanic
  • 227 POSTS
If it turned on when wiggling, could indicate bad connection in relay box. if only one turned on and other didn't when overheating, probably bad coolant sensor. If you have a test light you can try to probe wires to see if the other fan is getting signal to turn on. May have a bad fan motor.
Jan 26, 2014 at 12:37 PM
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