Question about 2001 Oldsmobile Alero

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2001 Oldsmobile Alero Temperature goes high - alarm sounds - steaming from under hood. Losing coolant. Have already replaced the Temp Sending unit, the Thermostat, and the Water Pump.

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I would have someone pressure test the cooling system to determined if there is an external or internal leak somewhere as it sound like you have one or the other. An internal leak, such as a head gasket, won't show up as a dripping coolant but will cause coolant to be forced out of the coolant reserve tank in a kind of bubbly burp as the engine warms up while an external leak usually can be spotted by following the trail of leaking coolant back to it's source. I would suggest having it checked out as soon as possible as serious engine damage can result from even a fairly short time spent overheating.

Posted on Jul 05, 2010

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Temp guage not working 1999 alero


One advantage us dealer tech's have over a week end warrior is that we have factory service repair information and have factory scan tool ,Tech 2 , to check data coming into the instrument cluster . Most of you probably don't even think about how that coolant temp infor shows up on the gauge , except by a coolant sensor !

High Temperature Indicator
The high temperature Indicator function handles the control of the Engine Temperature Gauge Display and the red High Temperature indicator. The Powertrain Control Module (PCM) reads the Coolant Temperature Sensor, filters the messages, and sends the coolant temperature to the instrument cluster via a Class 2 serial data message. The PCM monitors the coolant sensor in order to determine a fault. The PCM transmits the Class 2 serial data coolant temperature report messages to the instrument cluster for the temperature gauge display and for the high temperature indicator control.
The instrument cluster receives the engine temperature data in the Class 2 serial data message from the PCM. The instrument cluster converts this data into a temperature gauge pointer position which drives the gauge pointer. The instrument cluster also uses this data in order to determine the high temperature indicator control.
The Body Control Module (BCM) looks for the high temperature indicator Class 2 serial data report from the instrument cluster and triggers a chime when the indicator is ON.

Your best bet , take it to a qualified repair shop , rather then just replacing parts .

Feb 10, 2017 | 1999 Oldsmobile Alero

2 Answers

2001 alero is violently spewing coolant


Is the temp gauge working?
where is it spewing from?

Feb 07, 2013 | 2001 Oldsmobile Alero

1 Answer

2001 oldsmobile alero 6cyl smells like gas when it starts, takes a little while for the rpms to stabilize...


Check engine light on? sounds like it's flooding, may need to replace the coolant temp. sensor.

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1 Answer

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clean the engine compartment and fill the radiator start the car and let it idle until you find the coolant leak

Jan 12, 2010 | 2001 Chrysler Sebring

1 Answer

The temperature gage has stopped registering on the car, it stays at the bottom of the gage and does not move - does anyone know how much this kind of thing costs to repair


$30 or less. If it is the sending unit.Cheap place to start.There may be more than one.One for guage and one for computer, but you can buy the correct one at the parts store then pop the hood and go hunting.They may know the location at the parts store.You can always return it if you don't feel comfortible doing it yourself.Just do it when the engine is cold and when removing the old one have the new one close.You will start losing coolant when it is removed.Before you start remove any pressure by removing then reinstalling the radiator cap.

Dec 31, 2009 | 2001 Oldsmobile Alero

1 Answer

With a 2001 oldsmobile alero the temperature gauge shuts off , service engine light goes on but heat is still working, what's the problem


If by "shuts off" you mean goes all the way to the cold or no temp, then sounds like the thermostat is open and needs to be replaced. Could also be the temperature sensor and you are losing the signal. I would check to see the actual temperature of the engine to know the difference.

Dec 06, 2009 | 2001 Oldsmobile Alero

1 Answer

Where are the coolant sending units


ON THE LEFT CYLINDER HEAD BELOW THE THERMOSTAT HOUSING.IF YOU REPLACED THE COOLANT SENDING UNIT.STILL THE OVER HEAT LIGHT COMES ON YOU HAVE A SHORT IN GAUGE OR WIRE.

Sep 27, 2009 | 1995 Oldsmobile Ninety Eight

2 Answers

Location of the temperature sending unit on a 1991 olds toronado


Ok, you have three sensors on this engine that work together to manage the temperature reading that are sent to the gauge. i recommend checking all three to be safe. i will list the sensors and, locations below.

1. Coolant temperature sensor- Under hood, driver side, upper engine area, above transmission bell housing, mounted in driver side end of intake manifold.

2. Engine Temperature sensor- Under hood, driver side, upper engine area, mounted on rear cylinder head

3. Temperature switch.- Under hood, center, lower engine area, above oil filter, rear of coolant temperature sensor, mounted in engine block




Jul 09, 2009 | 1991 Oldsmobile Toronado

1 Answer

Whats wrong with my 1999 Alero


Slow cranking should be checked 1st by having the battery checked (free at most parts stores) to determine if it's time to replace it, or if it's something else. Even before this, check battery and starter connections to make sure they are clean and tight. Dirty cables can cause your problem. If the battery checks out ok, you should have the starter checked out, if it's on the way out, it will turn the engine over slowly.
Need more info on overheating. When does it happen, how often, is aux. cooling fan turning on when temp goes up, when was system last flushed, any leaks, or loss of coolant, is the engine actually 'boiling over', steam from under hood? Hot temp at idle, etc.

Apr 29, 2009 | 2000 Oldsmobile Alero

1 Answer

2001 Jeep Grand Cherokee Engine temg gauge not working


If you changed the coolant temperature sensor and it had a 5 volt ref signal to it then you replaced the wrong part. You need to replace the coolant temperature sending unit.  The coolant temp "sensor" is an input to the ECM for your fuel injection system. The coolant temp "sending unit" is for coolant temp reading at the gauge, It is an NTC switch (negative temperature coefficient) which means as temp increases/resistance decreases. 

Dec 19, 2008 | 2001 Jeep Grand Cherokee

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