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1999 Oldsmobile Alero Overheating

Tiny
JUNTOSUNO
  • MEMBER
  • 1999 OLDSMOBILE ALERO
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?
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Sunday, July 5th, 2009 AT 10:00 PM

4 Replies

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Is your cooling fan(s) coming on?
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Sunday, July 5th, 2009 AT 10:06 PM
Tiny
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Yes, but only when a/c is on.
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Sunday, July 5th, 2009 AT 10:19 PM
Tiny
BLUELIGHTNIN6
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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.
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Sunday, July 5th, 2009 AT 10:20 PM
Tiny
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Thank you. I'll try that.
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Sunday, July 5th, 2009 AT 10:24 PM

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