Question about 2003 Oldsmobile Alero

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Temp gauge goes over hot and clear down past cold mark. water boiling fans working car stalled and filled coolant ran normal then

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You should check and top of if necessary your coolant reservoir at least once a month. Other fluids to check at least once a month are, brake fluid, engine oil, transmittion fluid (automatics to be checked warm, idling in park).
Overheating is very harmful to your cars engine, and should be avoided/prevented at all cost. Once an engine shuts off due to excessive temperature, damage has already been done.

Posted on Sep 11, 2009

  • Frank  Fernandez
    Frank Fernandez Sep 12, 2009

    Also, if your temperature gauge is erratic or inaccurate? Check the temperature sending unit on the engine,as it's most likely at fault.

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1 Answer

Temp/gauge not reaching normal working temp-richer


the first thing to check is to feel if the radiator is hot, if the radiator feels hot and the engine is also hot the coolant is circulating ok then the problem is more than likely electrical, the temp gauge gets its signal from the engine control module the coolant temp sensor sends coolant temp signal to engine control module for engine managment purposes then passes it to instument pack/gauge, if the sensor was at fault you would have engine running problems also,with poss fault codes logged, if the engine and rad are cold/only warm after the engine has been run for 15 mins or so it sounds like the thermostat is stuck open but you have changed that. i have had faulty new ones in the past and have had to test them in a pan of boiling water, hope this is some help to you.

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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.

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Temp gauge stuck past hot mark


The stepper motor that controls the gauge is bad , gm had problems with 03 to 06 vehicles . Here watch the video !

How to repair GM Instrument Cluster Speedometer Gauge Stepper

Apr 20, 2017 | Pontiac Aztek Cars & Trucks

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The car was overheating i checked all hoses and replaced the thermostat the radiator it still is ovrheating and the water is boiling in the overflow tank


Answer could be a faulty thermostat,or it could be a sign that your head gasket is about to blow ,or last of all your timing could be out of sync.

Answer 2 from Inventus: It means your cooling system is funtioning properly. In a system having a coolant recovery tank, coolant in the radiator is always up to the brim, hot or cold. There is negligible or no air space. When coolant in the radiator expands sufficiently due to warming from the engine, it will squeeze past the pressure cap's bottom seal and flow into the recovery tank. (If no provision for such expansion was present, the expansion would rupture the radiator or your hoses.) Only coolant within the radiator is under pressure, and because of this pressure (together with the elevated boiling point that the "anti-freeze" permits), it normally does not boil. But once past the pressure cap's bottom seal, the overflow is at atmospheric pressure and therefore boils.
This boiling is usually unnoticed after a short, i.e., local, trip because the cooler coolant already in the recovery tank quenches it. But after some highway driving the influx of more hot overflow heats up all the coolant in the recovery tank to the (unpressurized, i.e., "natural") boiling point.
As the engine cools when shut off, the contracting coolant in the radiator sucks back coolant from the recovery tank. Fluid in the recovery tank should never be below the "full hot" or "full cold" marks, lest air be sucked in.
-- BETTER ANSWER ==
Your cooling fans are not turning on. It is not normal for your overflow tank to boil like that. It is true that your radiator is overflowing into the reserve tank, but that means yourr adiaotor is boiling. Check for blown fuses or relays for your cooling fans. IF theya re fine. run your engine for about 15 minutes and drive. When you temp level is at normal operating temp open your hood with the engine runing and see if your fans are on. If they are, then you may have a bad thermostat or a plugged radiator, or a bad water pump. If the fans are not on, get your cooling fan switch replaced if your car has one. Check your temp sending sensor

Oct 30, 2011 | Cars & Trucks

2 Answers

I just had the thermostat, a hose and water pump replaced in my 2006 Pontiac Grand Prix GT. The temperature gauge always stayed at half or under. It now is between half and 3/4 more towards 3/4. This...


This is not normal. Several possible causes are;
the wrong thermostat was put in, meaning the temperature setting is higher than the one that it replaced;
the fans are not working properly
if the cooling system was not flushed, you may have a blockage
if the radiator was not rodded out, it may have a blockage
the system may not have been completely filled with coolant
the cooling system may have been filled with less than a 50/50 blend of coolant and water ( I once left a shop that filled my car with water only and it boiled)
Since I don't know what your symptoms were before you had the work done, it is possible that you had one of these other problems and didn't know it.
Try the cheap fixes first:
Look at the overflow tank and see if it the coolant level is at the (cold) full mark if the car has been sitting overnight or at the (hot) full mark if the car was just driven. If it is not at the full mark add coolant and water in a50/50 mix until you have the tank at the full mark. IF it was mixed properly, the coolant should have color to it: gatorade green, or orange are typical, and it should feel slippery
when you rub it between your fingers

after that, run the car and check to see if the fans come on. they should come on after the car gets to the normal operating heat temp as shown on the gauge.

does the temp gauge show the car getting steadily hotter and then dropping down to 3/4? If that's the case then the problem is likely to be with the thermostat - it may be sticking and back to the shop it goes.

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3 Answers

NEW RADIATOR,1 YEAR WATER PUMP, NEW THERMOSTAT, STILL OVERHEATS,SENSOR OK, ERRATIC READINGS ON HEAT GAUGE WHEN DRIVING A SHORT TIME GAUGE GOES UP TO HOT AND ENGINE IS HOT. PARK FOR SHORT TIME AND THEN TURN...


Check first if the fan is running, you can do this by pulling out the temp sensor at the lower radiator hose. You should see the fan go on. If the mechanics has checked out everything, I suggest to see if there are added load on the engine such as busted bearing on the pulleys for the serpentine belt. Observe the coolant if it is boiling hard when you notice the temp go up. It might be a problem withe the sensor which triggers the ECU to shut the engine.

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1 Answer

Engine overheats when heater pipes connected


I think you could be right about there being air trapped in the system.
Or the heater core(radiator) is plugged.
Either way you need a pressurized radiator coolant pump to put the coolant in without air being trapped.
Although,i have seen it done by jacking the vehicle up high enough that the radiator was now higher than the heater core level, and then the coolant was put in.
But this is dangerous to try.

Jan 29, 2009 | 1999 Ford Escort

1 Answer

Hello, My 1992 Cadillac Seville has not been blowing heat for about one week. We replaced the thermostat and that did not work. Yesterday my car became really sluggish and started to overheat. The...


Help is HERE!
It looks like an Air lock scenario!
Park vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater to hot blower on full. When at operating temp keep clear of coolant filler area and listen, hopefully gurgling then a boil over, wait and then top up with very warm water/coolant let settle it may boil over again whilst air is still in system.
Check for heat inside car, if hot and coolant settled replace cap but keep an eye on temp gauge for a while as air lock may still be further along cooling system.
Please press the Blue button if sorted!
Paul 'W' U.K.

Jan 28, 2009 | 1994 Cadillac DeVille

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