Question about 2001 Oldsmobile Alero

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2001 Olds Alero suddenly quits sending heat then sometimes it does and sometimes it overheats. Is this a water pump or a thermostat. Help. Mallory M

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  • Oldsmobile Master
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Check the cooolant level, sound like theres a leak somewhere, water pump, hoses, t-stat bad, rad cracked, heater core leaking, bad rad cap, cooling fans not working, you need to get it looked at really soon, before you get it to hot and blow a head gasket.

Posted on Dec 30, 2010

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1 Answer

I changed the thermostat on my 01 olds alero but it still overheats. i have a small leak from the coolant expansion tank but not a big enough one to drain the whole tank. it seems like the tank overfl


try checking your water pump the fluid just my be sitting there n not circulating or is poorly flowing n also check your heater core it might be clogged might need replaced

Apr 22, 2013 | 2001 Oldsmobile Alero

1 Answer

Have an 2003 Olds Alero 2.2L, overheating. Removed thermostat housing/feed pipe to check thermostat to find no thermostat present, however the heat has working, although it has took 5 or 6 minutes to warm...


I can't give you any specifics on how to change your water pump, but I can answer your questions about the thermostat. Yes, the heat will work withou a thermostat. And yes, a car will overheat without one, especially in the summer months. The purpose of a thermostat is to allow cooler water to flow into your block, but also to allow the water adequate time to be cooled in the radiator. Without the thermostat, water is continuously cycling through your coolant system, getting hotter and hotter. Often I see people with malfunctioning thermostats jsut remove them, sometimes on the side of the road, just to get where they're going.

May 02, 2011 | 2003 Oldsmobile Alero

2 Answers

2001 alero running hot after changing water pump, thermostat


Was it running hot before you changed the pump and thermostat? Did you bleed the air out of the coolant system when you filled it back up? Some cars have bleeders on them to get the air out. If this is not done it will overheat. It could be possible that the new thermostat is causing you grief. I recommend using only OEM thermostat for that reason. If it was running hot before I would check the condition of your radiator and ac condensor fins. Make sure they are not packed with dirt, bugs, or whatever. You may have an internal engine problem such as a bad head gasket.

Apr 27, 2011 | 2001 Oldsmobile Alero

1 Answer

I have a 2001 Oldsmobile Alero. For the second time in a year my car has been overheating. The first time the problem actually went away after a few days before I even had the pressure tested. This was...


First the reason the heater is not working is because there is air in the system and these engine are known to trap air.There is a bleeder at the top of thermostat housing to remove the air.Take the radiator cap off while the engine is off and cold and add coolant/water mixture till fluid streams from bleeder screw(will need to be removed) then tighten screw and install radiator cap.Let it idle and see if it over heats and pay attention to the cooling fan operation and heater operation.If it does not overheat after 20 minutes the take it for a drive and see if it overheats.I fit does not overheat idling but does overheat driving you have a bad radiator.Dexcool is great for pugging radiators and heater cores.It is possible to flush the radiators and fix sometimes but new ones are not that expensive.I would probaly replace.If it overheats idling and fans are working suspect a bad thermostat.Good Luck!

Apr 20, 2011 | 2001 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

2 Answers

Thermostat bad?


in order to replace the thermostat u either have to remove the exhaust pipe on the left side of the engine (driver) or the lower intake but them engines are known for then lower intake gasket leaking and if you are loseing coolant then i would look in to haveing the intake gasket checked

Jan 28, 2010 | 2001 Oldsmobile Alero

1 Answer

A 2001 Alero with engine heating-up during idle (and more)


sounds like a thermostate problem for the over heating would have to no more info for the cost aspect

Sep 25, 2009 | 2001 Oldsmobile Alero

1 Answer

Car is over heating. Alero 2001


If you changed the hoses and thermostat and the car is still overheating, then the next thing to look at is the water pump. See if the water pump is leaking water from a vent hole. If it is, then the water pump is defective and will need to be replaced. Sure hope this helped.

Jul 20, 2009 | 2001 Oldsmobile Alero

2 Answers

Cant figure out how to change the thermostat on my 2003 Olds Alero.


  1. (This is for a 2.2L engine) If equipped with an automatic transmission, remove the exhaust manifold.
  2. Drain the cooling system.
  3. Remove the thermostat housing to water pump feed pipe bolts.
  4. Remove the thermostat housing to water pump feed pipe.
  5. Remove the thermostat.

Jun 24, 2009 | 2003 Oldsmobile Alero

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