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I have a 2003 olds mobile Alero, it began to over heat riding around the city so I replaced both the thermostat & water pump but the car still over heats. What else could be wrong?

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  • Cars & Trucks Expert
  • 87 Answers

Most likely air in the colant system, an air bubble trapped when water pump was replaced. An eazy way to tell if air is in the coolant system squeze the upper radiator hose, if seems empty or can hear coolant swishing around, then there is air in the coolant system and also coolant level not compmetely topped off.

Top off coolant with Antifreeze Concentrate, NOT WATER. water will boil and evaporate, 50/50 antifreeze mix is good but if you dont know how much water has allready been added to the coolant system then straight shots of Antifreeze is recommended when toppong off coolant level.

Remove Air and Top Off Coolant

•While Engine is cool
•Remove radiator cap
•Slowly fill to the rim with Antifreeze, while at the same time squeezing the upper radiator hose to swoosh around coolant, try to get as full as you can.
•Replace Radiator Cap
•Start engine and switch air fan on high
•Remove radiator cap
•Squeez upper radiator hose and add more Antifreeze as Nessesary
•Notice preasure on the coolant hose, while adding antifreeze Concentrate preasure on the hose will stiffin up,
When coolant is full turn off the motor.

Posted on May 08, 2017

  • Alex Cardenas
    Alex Cardenas May 09, 2017

    I tried that and still began to heat up, when the car is running for a while and it heats up you can heat the coolant on the top hose literally boiling

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  • Cars & Trucks Master
  • 4,608 Answers

Radiator fan maybe not working???

Posted on May 08, 2017

6 Suggested Answers

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Posted on Jan 02, 2017

wilsodfarm
  • 986 Answers

SOURCE: 99 olds alero car over heating rapidly

sounds like a head gasket or a cracked head,

Posted on Jul 28, 2009

  • 173 Answers

SOURCE: No heat in 98 jimmy. Replaced water pump,

Possibly.. the actuators which operate the doors actually have a position signal for reference, but the actual motors inside the actuators dont realize there is a limit and overshoot their limits causing the fine wires inside to rip apart rendering the actuator scrap but this happens when actuators are still plugged in to the connector while being taken off the heater door, and they can and will still move with the key in the off position if the actuator thinks it not in the proper position..thats how they work anyway.hope you had them unplugged untill the last, then this would'nt happen....hope this explaination helped

Posted on Dec 07, 2009

seanpwright
  • 2030 Answers

SOURCE: i changed the water pump thermostat and heater

1)Air trapped in system
2)plugged radiator
3)collapsed heater hoses while engine is running
4) heater control valve
5) blend door motor for hot/cold (VERY COMMON)

Posted on Jan 30, 2010

  • 6 Answers

SOURCE: 2003 Olds Alero heat will only work on High

It is the blower motor resistor

Posted on Feb 28, 2010

SOURCE: 1999 Alero: I replace the head gaskets thermostat water pump n...

OK you have done the engine side of things. If you have an electric radiator cooling fan make sure it comes on when radiator is hot, if not the fan motor is caned or the thermostat switch is faulty. Sometimes the fan motor is supplied by a fused/relayed circuit in which case these items will also need to be checked. Check that not only does the top hose from the engine to radiator get hot but that the bottom one does too. If not this would indicate a blockage perhaps in the radiator core due to sludge. If full of sludge give both ends a flush out with a high pressure hose. Like wise do the same with the bottom hose back to the pump. If the water is circulating and the radiator fan is working then the normal cooling system is working as it should. f the engine is running hot one last thing is to find the EGR valve and check that it is opening as it should. If not the combustion temperatures go very high. One indicator of a hot engine is blue/glazed spark plugs so take one out and check it for signs of hot running. If hot then look to clean the EGR valve and associated exhaust gas feeder pipe with frayed cable, cloth and and carb cleaner spray.

Posted on May 05, 2010

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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.

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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.

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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.

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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?


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TAKE RADIATOR CAP OFF WITH ENGINE COLD AND CHECK WATER ..MAKE SURE RADIATOR NOT BLOCKED,,PLASTIC BAG ETC. THIS SOUNDS LIKE LOW WATER OR RADIATOR ..STOPPED UP INSIDE ..IF YOU HAVE GOOD HEAT IT'S FULL OF WATER. REPLACE T STAT B4 RADIATOR..IT'S CHEAPER. ALSO CHECK FOR RADIATOR COOLING FAN OPPERATION..I,M RULING OUT THE WATER PUMP.

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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.

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