Question about 2002 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

I replaced the heater core now all the dash lights come on but it will not crank

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

Posted on Nov 06, 2012

  • 3 more comments 
  • stacyb893
    stacyb893 Nov 06, 2012

    I will try that and see thanks for your help I was not wanting to have to take the whole dash apart again but here we go I guess

  • yadayada
    yadayada Nov 06, 2012

    You do realize it is nearly imposs to know what you did wrong. Sorry that is the fact of it.

  • stacyb893
    stacyb893 Nov 06, 2012

    Yeah I know just have to retrace my steps that is all. I will fix it or give it my best shot thanks

  • stacyb893
    stacyb893 Nov 06, 2012

    I sit here one very proud person I fixed it and the car is working like a champ !!!!!

  • yadayada
    yadayada Nov 06, 2012

    Good I guess.

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Posted on Jan 02, 2017

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SOURCE: 2002 old alero 3.4L itermittent no start, star and stall

My daughter has the same problem and has been in contact with GM. The problem is the system, not the battery or fuel pump etc. GM has no direct fix or parts to repair. The battery disconnect/reconnect works best, its what a dealer will do and they reset the computer even though they find no error. Alero is also is prone to bad motor mounts effecting grounding which can cause the same problem. GM replacement mounts are the same as the problem mounts. Battery reset works here too. Since Olds is gone they won't invest, especially now. carry the battery wrench, drive it till you can't stand it any more and then trade in. Look at the net, its full of the same problem in multiple years of that Alero version. Shame its a nice car.

Posted on Apr 08, 2009

  • 407 Answers

SOURCE: no start

sounds like the ignition module

Posted on May 08, 2009

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1 Answer

My car jerks/ hiccups when I accelerate, and the engine shakes when I turn it on.


timing belt jumped a tooth?,causing burning smell from engine overheating?????????. Out of ignition timing causes erratic/missing/jerking and possibly die. All this " may be " a coincidence from heater core repair.

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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

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My 1999 Alero must have a leak somewhere because the thermostat gauge rises every few days. I put coolant in it at least 1 a week. I had a new water pump and thermostat put on it, but it is still...


CHECK AROUND WATER PUMP AREA.AND THERMOSTAT HOUSING FOR LEAKS.THE MECHANIC WHO PUT THE WATER PUMP ON MAY FORGOT TO PUT SEALANT ON BOTH SIDES OF THE WATER PUMP GASKET CAUSING LEAKS.LOOK AROUND THERMOSTAT HOUSING FOR LEAKING.IF THERMOSTAT SEAL WAS DAMAGE DURING INSTALLATION IT WILL CAUSE LEAKING.IF ALL LOOKS GOOD CHECK FOR COOLANT LEAKS AROUND RADIATOR .CHECK RADIATOR TOP AND BOTTOM HOSES FOR LEAKS AND CHECK HEATER PIPES AND HEATER CORES HOSES FOR LEAKS.IF ALL HOSES GOOD.CHECK FOR LEAKING CORE PLUGS.

Sep 26, 2010 | 1999 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

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    My heater just started to blow cold air, what are


    first likely problem is low antifreeze. If there isn't enough, it can't fill the heater core. wait til it cools down - about five minutes in this weather ;) and then open the radiator and fill it with antifreeze/water combination. If it takes a bit (more than a few pints, then you might try adding some Bars leak or radiator stop leak junk.

    If radiator is already full then you probably have a blocked heater core or a stuck thermostat and will need to take it in.

    Jan 04, 2010 | 2003 Oldsmobile Alero

    1 Answer

    Changed the heater core in 2002 ford ranger, now the winshield wipers wont work, bought new switch and still wont work? what is it????also the interior lights wont work. all fuses are ok.


    Why did you buy a switch? Did the original one meter out bad? Never replace any part till you understand how it works and how to test it. Work the wipers and the lighting issues as two separate problems. The wiper motor or relay etc may have failed around the same time as the heater core. Two separate things Unplug the wiper motor and turn the key on. Meter out the connector in different switch modes. Need a schematic of the circuit. Lights-- Problem is after the fuses and they are the start of most circuits. so you know you have an open circuit like a connector under the dash you disturbed unknowingly during the heat core deal or a loose ground wire.

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    Jul 04, 2009 | 2003 Oldsmobile Alero

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    Heater on a 2002 alero died


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    The heater core has gone out and will need to be replaced

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    Wont start security light stays on


    My girlfriend had the same problem, so we took it to the local dealer in Costa Mesa, CA and were told she needed a new engine to the tune of 5K. We decided to take it to our local mechanic and he discovered that the “ignition control box”, which apparently has the antitheft controls too and shuts the flow of gas to the engine because it thinks its being stolen when it malfunctions, was causing the starting problem. Once, the box was replaced it worked fine. Because the IBC controls antitheft, it will need to be “reprogrammed” be someone that has access to the proper equipment or the dealer. I think the whole thing was about $800 - $900. Sure beats $5,000

    Hope this helps,
    B

    Nov 22, 2008 | 2002 Oldsmobile Alero

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