Question about 2003 Oldsmobile Alero

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How to replace a heater core for a 2003 oldsmobile alero

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 2000 oldsmobile bravada heater core replacement

I have this problem also, what is holding the passenger side part of the top part of the plastic air box to the firewall?

Posted on Oct 20, 2008

GM Elec
  • 1000 Answers

SOURCE: Where is the fuel pressure regulator on a 2003 oldsmobile alero?

There are 2 fuel lines connecting to the fuel injector rail. The larger line is the pressure line and the smaller line is the return line. The smaller line attaches to the fuel pressure regulator. You will notice that the regulator also has a vacuum line attached to it. If you are planning on changing it your self, let me know. There is a specific way to change it for safety reasons.
Let me know.
Regards,

Posted on Mar 10, 2009

  • 334 Answers

SOURCE: how do you change the fuel pump on a Oldsmobile

your fuel pump is in the gas tank. you have to drop your gas tank. at a shop it sould 2 to3 hr to chang it. depands on how much gas is in it

Posted on Apr 01, 2009

  • 401 Answers

SOURCE: 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

Posted on May 03, 2009

  • 1 Answer

SOURCE: How do you change a serpentine belt on a 2003 Oldsmobile Alero?

Brute force - you have to pry up the tensioner pulley. The way we did it was put the belt over the alternator and A/C compressor, and get it back in place around the main bearing pulley. Then we took a bar and forced up the tensioner and slid the belt over the main bearing pulley. Voila . . .

Posted on Jul 12, 2009

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1 Answer

2001 olds alero. replaced thermostat last year. Heater still not blowing warm air just cold. AC works. Defrost blows cool air.


Heater core is bad. Part is about $40...labor is around $700. The entire dashboard has to be removed and this is a major time involved job. It takes 10 to 12 hours.

Aug 22, 2016 | 2001 Oldsmobile Alero

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2003 oldsmobile alero a/c and heater fan quit working


Connect it directly to power to see if it works. If not, replace

Dec 07, 2013 | 2003 Oldsmobile Alero

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Replacing heater core


Click here to see heater core repair guide.

Nov 23, 2012 | 2000 Oldsmobile Alero

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What would cause my 2002 Alero not to start at all lights come on but wont start after I replaced the heater core


You left something disconnected is my best guess. Look under the dash and see if the ignition switch is connected completely.

Nov 06, 2012 | 2002 Oldsmobile Alero

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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.

Oct 29, 2012 | 2003 Oldsmobile Alero

1 Answer

Olds alero leaking collant through air condtion overflow


Heater core must be leaking. It is located close together in the dash next to the ac evaporator so it can leak out through the ac "overflow" hose.

Jun 06, 2011 | 2003 Oldsmobile Alero

1 Answer

I have no interior heat. Boiled over 2 weeks ago. had rad flushed and all new antifreeze. Worked for 1 week and then no heat at all. Replaced thermostat. Still no heat although all hoses are hot.


there is two things. one is low coolant the other and most likely is heater core is plugged flushing the coolant causes things to loosen up stuff and it gets stuck in the heater core if you take heater hoses off and back flush the heater core with a garden hose and you will have better heat then you ever had.

Dec 17, 2010 | 2003 Oldsmobile Alero

1 Answer

Instuctions for removing heater core


  • Disconnect the negative cable from the Oldsmobile Alero's battery. While the car is securely raised on jack stands, drain the engine coolant into a clean container. Most models don't have a drain plug on the bottom of the radiator, so you must take off the lower radiator hose to drain the system.
  • Step 2 Remove the drain tube from the heater's housing and disconnect the heater hoses from the core. Take off the center console, if one is equipped. Then, take off the sound insulators on both sides of the car, the steering column's opening filler, the air outlet duct and the floor air outlet to reach the heater core.
  • Step 3 Disconnect the heater core cover. Remove the core-to-housing mounting clamps and remove the heater core.
  • Step 4 Install the replacement heater core. Connect the mounting clamps and replace the core cover.
  • Step 5 Replace the rear floor air outlet, air outlet duct, steering column opening filler, sound insulators and center console (if equipped). Reattach the heater hoses to the core and the drain tube to the housing.
  • Step 6 Fill the cooling system, using new coolant if the old liquid doesn't appear clean. Be sure the lower radiator hose is securely back in place before filling the radiator. Reconnect the negative battery cable.
  • Step 7 Start up the Oldsmobile Alero's engine and let it run until it reaches normal operating temperature. Observe the climate control operation and check for any leaks in the system.


  • Read more: How to Replace the Heater Core in an Oldsmobile Alero | eHow.com http://www.ehow.com/how_4590629_replace-heater-core-oldsmobile-alero.html#ixzz0uQeICxug

    Jul 22, 2010 | 2000 Oldsmobile Alero

    1 Answer

    My 2003 olds alero keeps over heating. I have had a major tune up, changed the thermostat and its still over heating. The water pump is working fine. What else can it be?


    It could be that your heater core is blocked. I would suggest getting the cooling system flushed, and get a mechanic to see if there is blockage.

    Jul 05, 2010 | 2003 Oldsmobile Alero

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