Question about 1999 Oldsmobile Alero

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My 1999 Olds Alero has a issue with the fluid backing out of the overflow tube. I did a flush and fill for the radiator and replaced the cap, what would be cause it. I did replace the radiator with a used one for a junk yard. Can you assist me?

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Fow, t-stat, water pump first tings to check
if ok compression gasses going in
performed test

Posted on Mar 31, 2011

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  • Master
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Often times coolant gets pushed out of the overflow as cylinder compression is leaking through a bad gasket or crack into the cooling jacket. Many shops can check for the presence of combustion chamber gases in your coolant. That would confirm it before you start doing the head gaskets.

Posted on Mar 31, 2011

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1 Answer

2002 Oldsmobile Intrigue- Radiator Flush


you may need to replace the thermostat or the water pump to solve the overheating issue.
The leak in the overflow was NOT the cause of over heating.
You do have a radiator cap. It is the one on top of the overflow.

The radiator drain petcock is on the bottom of the radiator near one of the corner edges.
(Some face engine, others face the grille)
If for some reason you still can not find it, you can always pull the lower radiator hose (make sure water/engine is cold)

once you flush/fill the system, use a 50/50 mix of water and the proper antifreeze. (older cars use green, newer use orange)

If you are unsure, just ask the guys at the auto parts place which one you need and note that they sell an orange color that can be safely used in old and new cars and it can also be mixed with any color of fluid.

After you have the system filled, start the engine and remove the fill cap.... let it run and watch for air to rise out from the opening. (Some coolant/water may overflow, but you need to watch for any air bubbles coming out)

Once you don't see any air trying to escape, put the cap on tight and you should be good to go,

Another cause for overheating is air trapped in the system.

I hope this helps.

Jan 27, 2013 | 2000 Oldsmobile Intrigue

1 Answer

What is proper method for flushing the radiator and engine in a 1999 Pontiac Montana?


1: Drain coolant system
2: Purchase coolant flush, making sure you have the proper amount for your size of coolant system
3: Pour coolant flush into your radiator, filling the rest with water
4: On the coolant flush bottle it will tell you how long to run your vehicle
5: Once done running, let cool enough to open radiator cap, and drain system COMPLETELY by first draining out of pep **** on radiator, then taking one side of the hoses off the radiator and draining those
6: Put hoses back on and fill system with coolant. When the fluid gets to the top of the fill port on radiator, start vehicle and let run, allowing air to escape the system, and fill as necessary

Oct 27, 2012 | 1999 Pontiac Montana

1 Answer

Why is 99 olds alero have no heat and fluid coming out of overflow


You may have a physical obstruction between the radiator and the heater cool. This could be a kinked hose, a vapor lock, or a stuck thermo. While the car is cool, take off the radiator cap, and then let idle up to temperature and look to see if water is moving through the radiator. If no water is flowing, definitely start by replacing the thermostat and then go from there.

May 01, 2012 | Oldsmobile Alero Cars & Trucks

1 Answer

I have a 1999 oldsmobile alero and there are 3 tubes connected to the antifreeze. 2 go to the engine which are by eachother in the front of it, and one by its self towards the back of the antifreeze. well...


SMALL COOLANT HOSES ON RADIATOR OVERFLOW JUG LOCATION. BACK SMALL HOSE ON OVERFLOW JUG GOES TO THERMOSTAT HOUSING THE SMALL FRONT HOSE ON OVER FLOW JUG GOES TO RADIATOR.LOOK AT TOP RADIATOR ON PASSENGER SIDE YOU WILL SEE SMALL TUBE ON RADIATOR THATS WHERE OTHER SMALL HOSE GOES.

Dec 21, 2010 | 1999 Oldsmobile Alero

1 Answer

How do you change transmission fluid in an 1999 alero olds


This usually depends on what kind of transmission maintenance you wish to do. if you want to do a complete flush you need to take it to a shop and have it flushed professionally. If you would rather do a drain and fill, then this is definitely something that can be done at home. I would also recommend changing the transmission filter and pan gasket. Will only take you a few extra minutes and will save you alot of trouble in the long run. Before you get started, be aware that it is not always recommended to do a complete flush on older model, high mileage vehicles. As the transmission fluid becomes worn, it creates deposits and when you completely flush the system, sometimes the deposits are left behind and will clog up the oil ports and cause you some major headaches. Always do at least 5 drain and fills before you flush the whole system. For a complete pictorial guide on how to perform a drain and fill please go here.

Nov 03, 2010 | 1999 Oldsmobile Alero

2 Answers

Why is coolant being thrown out overflow tube?


The cap may be bad, or the solution in the coolant system is not 50/50 coolant to water and it's boiling over.

Oct 02, 2010 | 1999 Oldsmobile Alero

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.


Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

Sep 07, 2010 | 1999 Oldsmobile Alero

2 Answers

1999 Olds Alero. Low coolant light comes on and stays on even though its full. Starts running hot to the 3/4 mark. When the heater is turned on it cools off. Could this be the thermostat or the water pump.


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.

Mar 20, 2010 | 1999 Oldsmobile Alero

1 Answer

Tranny fluid


remove the air box the cap is under that it should be taken to a service dealer that has a specil fill process no dip stick if u have the tranny fluid u drained u can measure that and put the same amount in hope this helps

Mar 24, 2009 | 2001 Oldsmobile Alero

6 Answers

1999 olds alero


There is not your typical dipstick but underneath the hood about half way to the fire wall is where you put it in. If you unscrew the cap and fluid drips off if it does not you need more.

Jun 14, 2008 | 1999 Oldsmobile Alero

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