1999 Oldsmobile Alero Overheating

1999 OLDSMOBILE ALERO
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JUNTOSUNO
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  • 4 POSTS
Engine Cooling problem
1999 Oldsmobile Alero 6 cyl Front Wheel Drive Automatic

Overheating and water purging back up through reservoir tank. Water pump, thermostat and reservoir tank cap all replaced. Any ideas what is causing?
Jul 5, 2009 at 3:00 PM
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BLUELIGHTNIN6
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  • 16,542 POSTS
Is your cooling fan(s) coming on?
Jul 5, 2009 at 3:06 PM
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JUNTOSUNO
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  • 4 POSTS
Yes, but only when a/c is on.
Jul 5, 2009 at 3:19 PM
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BLUELIGHTNIN6
  • ✓Experienced Mechanic
  • 16,542 POSTS
Okay..that is your problem then. I would suspect a faulty engine coolant temperature sensor preventing the fans from kicking in. You may want to first test the cooling fan relays though.
Jul 5, 2009 at 3:20 PM
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JUNTOSUNO
  • MEMBER
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Thank you. I'll try that.
Jul 5, 2009 at 3:24 PM
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