Question about 2003 Oldsmobile Alero

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2003 Alero, heater won't shut off? Fan shuts off but can't turn heater off.

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  • Oldsmobile Master
  • 2,620 Answers

Faulty heater control valve.Its located under the hood on the passenger side in front of the firewall.

Posted on Oct 29, 2012

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Posted on Jan 02, 2017

  • 14036 Answers

SOURCE: I HAVE A 99 ALERO OLDS.4CYL.& IT WON'T PASS SMOG

IF DECELERATION FUEL REDUCTION SYSTEM IS NOT OPERATING, FUEL ECONOMY WILL BE REDUCED WHILE HC AND CO EMISSIONS ARE INCREASD.SEE ON MANY ENGINES WITH DECELERATION FUEL REDUCTION SYSTEMS THE PCM STOPS GROUNDING THE INJECTORS IN A SPECIFIC RPM, DURING DECELERATION.

Posted on Jun 24, 2011

  • 1 Answer

SOURCE: 2003 alero dash light won't shut off

I had the same problem in my 03 alero. I turned the key into the on position pressed the gas peddle down 3 times and it went off and hasn't been on for over a month.

Posted on Jun 17, 2009

  • 2501 Answers

SOURCE: shutting down

Try replacing the air filter.

Posted on Dec 21, 2009

  • 58 Answers

SOURCE: Why won't my car heater shut off

You have a short in the switch or resistor pack. replace the switch

Posted on Feb 03, 2010

  • 6 Answers

SOURCE: 2003 Olds Alero heat will only work on High

It is the blower motor resistor

Posted on Feb 28, 2010

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1 Answer

2003 Oldsmobile Alero won't start


Chances are you got water inside the fuse box or a wiring harness connection.
You may have to start tracing circuits to find out what is getting power and what is not.

Jan 10, 2013 | 2003 Oldsmobile Alero

1 Answer

2002 alero ran.shut off won't restart.Replaced fuel filter,now it gets gas,but still won't start.


For some reason aleros have this problem every once in awhile. It might be the security on the alero. What you would have to do is turn the key all the way to accel i believe right before you start it and let it sit for about 13 minutes. affter this the security will recognise itself and start your car

Dec 30, 2012 | 2002 Oldsmobile Alero

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2000 chevy venture heater fan won't shut off


Usually a sign of a stuck fan relay.

Dec 24, 2012 | 2000 Chevrolet Venture

1 Answer

No heat till you start driving and then fan will kick on and not shut off but it doesnt overheat


You won't get heat right away. The heat has to have time to reach the heater core. That's where you get the heat for the passenger compartment. But if the fan isn't turning off, then I would have it checked for an electrical problem.

May 05, 2012 | 1999 Dodge Caravan

1 Answer

Shutting down


Try replacing the air filter.

Dec 21, 2009 | 2003 Oldsmobile Alero

3 Answers

The heater/ac fan only works on speed settings 4 & 5


you might check your switch sounds like to me that your two lower speed sides of the switch maybe burnwed out.

Dec 19, 2009 | 2002 Chevrolet TrailBlazer

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