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I have a 99 oldsmobile alero 2.4 engine. it froze up. i drained it after it thawed and filled w antifreeze and water. now its overheating and heater is blowing cold air. what could be wrong?

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Check the oil and see if there is water/antifreeze in there, the oil will be milky, if it is you will need to rebuild the motor or else get another depending on what froze up. Also, something else may still be frozen up, park the car inside a heated garage and let it warm up for a few hours and then try run it again, there may be ice blocking the coolant from getting to the motor from the radiator.

Posted on Nov 28, 2014


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Posted on Jan 02, 2017

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SOURCE: Overheating 93 Subaru Legacy

water pump could be bad again. if the seal is out lets air in around pump propeller and it won't move water and it over heats. its a lot of work but you can fix it your self

Posted on Dec 21, 2008

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SOURCE: Toyota Celica gts 2000 blowing cold air when heater is on.

nothing try back flushing heater core, they clog up due to litle water preasure,you might want to flush cooling system if you already havent, hope this hleps.

Posted on Oct 06, 2009

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2000 Oldsmobile alero had water in the coolant and it froze over night now it over heats and shoots the coolant out the overflow . I don't think the water pump is out. What else could be wrong?

Very serious.... don't over heat too much or your car will break..... could be the thermostat is hooped... or the water pump.... make sure the car is completely thawed.... but i'd she over heats take her to the mach.... night cost a few bucks but no car costs a lot more

Nov 19, 2014 | 2000 Oldsmobile Alero

1 Answer

99 alero overheating

Girls like it, boys use it, parents hate it

Aug 15, 2017 | 1999 Oldsmobile Alero

1 Answer

Need to drain coolant from 99 alero

buy a flush kit from Walmart, about 5 bucks. cut the top heater hose add the kit hook-up water hose then on the bottom driver side of radiator unscrew plug and drain, then turn on water hose flush till clear, then add your coolant

Oct 20, 2011 | 1999 Oldsmobile Alero

1 Answer

Coolant level ok no leaks new 195 deg. thermostat still very little heat from heater defective heater core?

I am assuming your vehicle has the pink antifreeze called Dexcool. This is the recommended coolant for all late model GM cars and trucks. This coolant tends to form a pasty sludge in the cooling system which can lead to overheating and/or plugged up heater core. Try flushing the cooling system with a good aftermarket product such as prestone radiator flush. First thing to do is drain all the pink coolant, then add the radiator flush and fill with plain water. Run the engine according to directions on the flush container. Drain the radiator again and refill with plain water. Run the engine for a few minutes and drain again. Keep repeating this until all the pink antifreeze has been eliminated. Fill the system with 2 gallons of green antifreeze. Make sure the antifreeze container says it is compatible with aluminum engine parts. Hope this helps. If it does, then you won't have to replace the heater core.

Dec 16, 2010 | 1999 GMC Sonoma

3 Answers

My 99 olds alero is kinda over heating. i added water and it stayed stable for a while and started going up again so i then bleed it and it went down. i brought some antifreeze to put in the surge tank...

Check the radiator hoses after engine is warm.
If one is cold - the thermostat has failed and must be replaced.

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Sep 07, 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 |

    Jul 22, 2010 | 2000 Oldsmobile Alero

    2 Answers

    My alero 99 was overheating now engine soon light came on

    What you can do is go to a parts store like Auto Zone or most part stores and have them check the codes.This will help find what could be causing the light to come on.It could just be something that was disconnected or removed when the thermostat was replaced.Let me know what you find and I`ll be glad to help you out.Good luck.

    Apr 21, 2010 | 1999 Oldsmobile Alero

    1 Answer

    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

    2 Answers

    2001 Oldsmobile Alero overheating

    I think you started out looking in the right places. Replacing the coolant, thermostat, relay and sensor are all fairly inexpensive.

    I believe you either have blockage in the system (especially if you're using tapwater), or your water pump may be failing.

    I would first either take it to a radiator shop and have them flush the cooling system out thoroughly, or else pick up a chemical flush kit and do it yourself. This involves more than just drain and refill.

    If this doesn't work, your next step will probably be replacing the water pump. At almost 200k miles, it's probably about due anyway.

    Jun 16, 2009 | 2001 Oldsmobile Alero

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