Question about 1994 Oldsmobile Achieva Special Edition

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Why would a 1994 Oldsmobile Achieva S quad 4 engine temperature gauge fluctuate between 195 & 220 degrees? The thermostat has been changed and the engine and radiator have been flushed. The normal operating temperature is maintained on the highway but, when stopping at a traffic stop, the temperature gauge climbs to 220 degrees. I'm aware that the gauge does no show the actual temperature of the coolant. The coolant is getting to around 230 degrees. But, the guage has never fluctuated to this degree before, except when the cooling fan motor was not pulling enough air over the radiator. That was over two years ago.

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tim fredrickson

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Either the thermostat is getting ready to fail or the temp sensor isnt working properlythese engines also leak fluid from rear side of head after getting hot so check that so may have air in system because of the blown head gasket

Posted on May 28, 2011


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Why does the temperature gauge on my 1995 Chevy K2500, 5.7L read 150 degrees ?

If you replaced the SENSOR and not the gauge SENDER, there's your answer.

The SENSOR sends the computer (ECM, PCM, ECU, etc.) the engine temp so it can make the adjustments to the fuel, timing etc.

The gauge SENDER makes the gauge read what temperature the engine coolant is.

Hope the helps.

Feb 21, 2015 | 1995 Chevrolet K2500

1 Answer

What causes hyundai Elantra 2002 tempature gauge fluctuates between normal and hot

The thermostat "seals" the cool coolant giving up (rejecting) heat in the radiator & heater core from the hot coolant absorbing heat in the running engine "block".

When the coolant in the engine reaches a specific temperature (180 ~ 195 degrees) as determined by the value selected by manufacturer or when replaced, it opens and allows the hot coolant in the engine block to be pumped out to the radiatot & heater core for cooling and the cool coolant in the radiator / heater core is pumped into the engine block - replacing the hot coolant. The thermostat senses cool coolant in the engine block and seals shut until the temperature of the coolant in the engine block rises to 180 ~ 195 degrees again. This process continues over and over for as long as needed.

You should check to make sure that the coolant level in the reservoir / radiator is sufficient by checking when cold. Do NOT remove a radiator cap when it is hot! With the cap off, start the engine and add additional coolant as the engine warms up to normal operating temperature. If coolant levels are ok, the trouble could be related to the thermostat or possibly a faulty temperature sending switch. This means that the temperature of the coolant is fine - but the switch or sensor that converts the temperature to a voltage for the gauge on yur dashboard is the problem.

If the temperature is fluctuating up and down, you should have it fixed. Good luck!

Apr 12, 2013 | 2002 Hyundai Elantra GT

1 Answer

My temperature gauge warns up normal but the fluctuates between normal and half way to cool... What could the problem be? Dangerous?

Probably not dangerous.
Assuming the radiator is full of coolant, it could be a normal thing where the thermostat is opening and closing at 195 degrees.
Or the cooling fan could be going on and off.
The thermostat opens at 195 degrees on most cars and the cooling fan comes on at 220 degrees.

Jan 14, 2013 | Cars & Trucks

3 Answers

Changed the thermostat on a 1994 Corsica 2.2 4 cylinder because the gauge was moving from the 1/4 position to 1/2 of temperature range. What do you think could be causing this swing in temperature

Your fan coming on to cool the engine coolant is the reason it fluctuates, but the temperature sensor or gauge are only as good as their condition-in other words, the best way to determine if your fluctuations are from the sensor, gauge, thermostat or even the PCM is to use a remote temperature gauge, an infrared hand-held temperature gauge, or replace the sender, then thermostat. Doing the last two is probably the easiest and least expensive.

Jan 03, 2011 | 1994 Chevrolet Corsica

1 Answer

Thermostat temp guage goes to 220 degrees

220 degrees is normal operaing temperature for your car. The thermostat does not open until 195 degrees and the fans don't come on until 126 to 128 degrees. If it gets over 129 degrees and the fans have not turned on then the cooling fan system is the cause of the problem. (cooling fan, cooling fan temp switch, cooling fan relay, etc.)

Dec 05, 2010 | 1994 Buick Century

1 Answer

What temperature should the thermostat run? Just added antifreeze and its running at about 220, that seems a little hot?


Jun 13, 2010 | 1994 GMC Jimmy

2 Answers

The cars temp gauge goes up and down,and looses heat. I am thinking a bad thermostat or lack of antifreeze/coolant. Is this a correct assumption?

My mechanic has had my Silhouette for two weeks for the same problem. Engine Tempurature is running at 195 degrees when the gauge is pegged on overheat. Normal operating temp for this van is 220. So it is not overheating. Had the cooling/heating system flushed and refilled, bled and topped off. Still the gauge is up and down like a yoyo. Still looking for answers.

Oct 10, 2009 | 2001 Oldsmobile Silhouette

3 Answers

What the normal temperature operating range indicated on the temp gauge?

195 degrees is the typical high end on the thermostat (when the thermostat opens), so the temp gauge should read a max of 195 degrees, give or take a few degrees. Some people replace their thermostat with a lower temp one, such as a 180 degree one. Then the gauge will read lower (approx 180 degree max). So the range is typically from cold at start to just under 200 degrees.

Jul 31, 2009 | 1995 Oldsmobile 88

1 Answer

1994 Buick Skylark overheating

This vehicle uses a 195 degree thermostat. Standard operating temperature is about 210. If the vehicle was running 160 before then the thermostat was probably stuck open before.

Jun 17, 2009 | 1994 Buick Skylark

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