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Posted on Sep 15, 2010
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2003 Oldsmobile Alero, the engine turns over but the car won't start.

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Jeffrey Turcotte

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  • Oldsmobile Master 8,991 Answers
  • Posted on Sep 15, 2010
Jeffrey Turcotte
Oldsmobile Master
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Joined: Aug 22, 2010
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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.
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2003 Alero, heater won't shut off? Fan shuts off but can't turn heater off.

Faulty heater control valve.Its located under the hood on the passenger side in front of the firewall.
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2003 Alero won't shift into overdrive

Why will my 2003 Oldsmobile not shift into drive
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2003 alero steering won't lock and nothing happens when you turn the key in the ignition

If the security light keeps flashing,you might as well do a reset.
Be sure to turn off all the accesories including the radio before you start the process.
Insert the key to the ignition switch and turn the key to ON position without starting the car.
leave it ON until the flashing light (security) stops.It will take approximately 15 to 20 minutes.
As soon the flashing stop,turn the key to OFF
position and start the cart.
Hope this help.

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Car won't start

start by checking for spark, then check fuel pressure and injector signal, so you need a spark tester and noid light
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Shutting down

Try replacing the air filter.
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We need to reset the computer on a 2003 Oldsmobile Alero

HI there if the scan tool you are using will not reprogram the theft module the try the 10 min relearn

  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to start the engine, then release the key to ON (vehicle will not start).
  3. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
  4. Turn OFF the ignition, and wait 5 seconds.
  5. The vehicle is now ready to relearn the Passlock™ Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK. Important: The vehicle learns the Passlock™ Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
  6. Start the engine. The vehicle has now learned the Passlock™ Sensor Data Code and/or password.
  7. With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles
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2003 Oldsmobile Alero Thermostat/Fan Trouble

they should turn on at about 213 orbetween 200 and 215 dont let it go over 230 if so please turn off
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