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?
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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