Question about 2004 Oldsmobile Alero

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How do you change the thermostat it goes from cold to mid point never to hot, the gauge will drop down to cold and vehicle feels like it wants to stall. is this telling me i need a new thermostat?

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Sounds more like a new temperature sensor.
Don't throw parts at it. Have it tested with a scanner by a knowledgable shop

Posted on Sep 29, 2010

  • Anonymous Sep 29, 2010

    Coolant Temp Sensor-Won't stay in closed loop and computer refers back to open loop and it almost stalls. Just a possible problem,get it checked out.

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Posted on Jan 02, 2017

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2003 chrysler town and coy try, temp gauge goes up and heater gets warm when idling, but as we drive the temp gauge goes way down and heater blows cool air. Any suggestions?


1. Engine Coolant Temperature.
If the thermostat in the cooling system is getting stuck in the open or partially open position rather than opening and closing as needed to keep the coolant at the required operating temperature then you will get the results you have described here with the coolant temp dropping as you drive. The radiator is providing optimum cooling when the car is moving and there is plenty of cold air flow through it.
I am assuming the temp gauge in the vehicle is reading correctly.

Thermostats in the cooling system do become faulty in time and it may well never have been changed (or only changed once) since the car was built and is possibly gummed up with debris. With those symptoms I would definitely change the thermostat. Make sure a full flush of the cooling system is done at the same time and refilled with fresh coolant.

2. In Car Heater.
I would not worry about the interior heating until you change the thermostat on the cooling system. However if you continue to get cold air from the heater then there will be an issue with hot coolant from the cooling system being restricted in flowing through the heater core.

Feb 22, 2016 | Chrysler Cars & Trucks

2 Answers

I have a 02 Grand caravan that has new radiator, termostat, one new fan. the temp gauge goes up to max hot the drops right back down in seconds. what could be the problem?


it could be you have an air lock in the cooling system
remove the rad cap from the rad, start the engine and let it run until the coolant drops (add to fill it back up) or until the coolant boils out of the rad spout.

maybe pull the heat sensor. -replace it OR clean it off, reinstall it.

Mar 12, 2015 | 2002 Dodge Grand Caravan

1 Answer

Temperature gauge cold then back to normal


You have to make sure the thermostat is working properly and is the correct one. Idle the vehicle for about 20 minutes and then feel the upper radiator hose. It should be hot to the touch. Drive the vehicle and when the temp gauge falls to 'cold' stop and feel it again. If it is much cooler to the touch than before the thermostat is defective or wrong.

Mar 23, 2014 | 2000 Ford Ranger SuperCab

1 Answer

Temperature gauge goes up then down engine


Sounds like the thermostat is sticking, on warm up on lot of vehicle the gauge goes past normal and when the thermostat opens drops back. If it is going higher than normal, the thermostat is opening late. Needs changing before it stops opening altogether.

Jan 07, 2014 | 1996 Lincoln Mark VIII

1 Answer

Temp gauge goes up to hot then back down only a few times


This is a sign that the thermostat is sticking shut and then opening after the temp gets past a certain point. If the heat gauge goes to high and then drops down suddenly, this is the likely culprit and you need to replace the thermostat - again.

I have had them arrive from the parts store and be defective.

May 18, 2017 | 2001 Pontiac Aztek

2 Answers

My antifreeze resevior is completely filled but my temp guage raises above the mid point then drops below the mid point then raises then drops. I started the car and noticed that only one of the two fans,...


The thermostat may be wearing out. A thermostat controls the engine temperature to keep it at a consistent temperature, The other fan will probably turn on if you turn on your Air Conditioner.

Mar 04, 2010 | 2002 Kia Optima

1 Answer

Heating problem for bmw


It sounds like your thermostat is broken. The metal retaining tabs that hold the thermostat together can break over time. I would recommend pulling it out and checking it. When installing a thermostat there is an arrow on the edge. Make sure it points up. toward the top of the cylinder head.

Mar 08, 2009 | 1994 BMW 3 Series

1 Answer

2000 Elantra Overheating


First when vehicle is cold like in the morning check and make sure that the vehicle has enough coolant/ antifreeze in radiator and reservoir. If coolant is need use a 50/50 mixture of water and antifreeze. You will need some time to do this let car run at idle until the temp guage is in the middle NOT+ normal operating temperature. At this point if the thermostat should be in the open position. Let vehicle run and check to make sure that radiator fan comes on. This should come on when guage is about midway/half way. If temperature rises above half going to h/hot and fan doesn't come on, you either have a BAD FAN BAD FAN SWITCH BAD FAN RELAY OR BLOWN FAN SWITCH FUSE. You will need to check all of the following I will help if its needed. If fan comes on and doesn't go off and vehicle continues to get hot even with fan running. Feel radiator hoses and see if the lower radiator hose is cool/cold. If it is you have thermostat that stuck closed. Replace thermostat and fix problem. If all the above is good and vehicle continues to over heat. THE BAD NEW IS THAT YOU MAY HAVE A BLOWN HEAD GASKET /CRACKED HEAD /BROKEN WATER JACKET. Basically you will need a HEAD JOB at least a head gasket. ONe tell tail sign of this is oil looking like milkshake/chocolate milk-a creamish while residue in oil or antifreeze. Contact if you need hel0p. Good Luck and thanks for using FIX YA

Jan 10, 2009 | 2000 Hyundai Elantra

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