Question about 1995 Buick Regal

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Temperture gage it go cold to hot then cold then to hot. while driven it will go from extrem to the other. is this the therma stat.

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Thermostat might be sticking

Posted on Dec 09, 2008


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Temperture gage starting to fluxuate while driving.

This can be caused by an insufficient coolant (aka antifreeze) level. Look at the coolant level in the reservoir under the hood. There should be two marks on the bottle "warm" or "hot" and "cool" or "cold". If the engine has been running for a while as in the case when the car has been driven few miles, the coolant level should be up to the "warm" or "hot" line on the bottle. If the car has been parked without the engine running for a couple of hours or more, the coolant level should be at the "cool" or "cold" line on the bottle.

Never remove the radiator cap when hot or if the engine has only been been stopped for less than 2 or 3 hours.

If the hot coolant is at a level that is below the warm or hot line, you should add more of the coolant / water mixture only to the reservoir - not to the radiator. If you are only able to check the coolant level when it is hot - you will have to repeat this procedure until the coolant level of the reservoir is maintained. Checking the hot coolant level can only be done when it has been allowed to cool between hot checks. The cooling period is the only time when coolant is drawn from the reservoir back into the radiator.

If the cold coolant is at a level below the cool or cold line of the reservoir you should add more of the coolant / water mixture to the reservoir and to the radiator, too. Fill the radiator to the top of the neck where the tube from the reservoir connects to it.

If you're still having widely fluctuating temperatures while driving at normal operating speeds, there may be a problem with the water pump, thermostat or other portion of the cooling system.

I hope this helps & good luck!

Oct 19, 2011 | 1994 Toyota Corolla

1 Answer

My 2007 Chevy HHR 2.2L, coolant temp sensor is reading that the coolant temp is 20 degrees warmer than the outside temp after sitting for over 12 hours and the operating temp gets to 214 degrees without...

Sure the engine coolant will be warmer than the outside temperture and if the car has been sitting a long time in cold weather and the outside temperture warms up it could be the other way around. The coolant temperture sensers aren't real accurate as they are a relaitive senser beween hot and cold and the numbers reported don't have to be real just the change from hot to cold and the reching of the coolant to the operating temperture. Noe it the senser doesn't read the opertating temperture coprrectly you'll have all kinds of problems. The therostaste will try to set the temperture of the water to it's set temperture and can open or close completly to get 195 degrees F. Many times if it's too cold then the stat is bad and needs to be replaced This shows up in alot of cars first thing after winter and the first onset of cold weather when the daily tempertures vary the most from day to night.

May 06, 2011 | 2007 Chevrolet HHR Special Edition

1 Answer

Put in a new water pump and thermas stat and the gage still goes to hot

Do you have access to a non contact laser temp gauge?
If so shoot the thermostat housing and see if the gauge is correct.

If the gauge is off from the laser then replace the engine coolant temp sensor,
If the gauge is correct then double check the thermostat installation,is it in backwards? or maybe you got a bad thermostat.

did you flush the entire system when you replaced water pump?

Jun 02, 2010 | 1996 Dodge Ram

1 Answer

Temperture gage reads hot heater blows cold air

. make sure valve on hose to heater from radiator is all the way open.

Mar 01, 2009 | 1995 Oldsmobile Cutlass Supreme

1 Answer

Temperture gage not working

If you unplug temp sending unit and turn ignition on check guage. It should read all the way hot or cold. If so then replace temp sending unit.

Feb 25, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Temperture Gage

First of all, it doesn't sound like your thermostat is working correctly to keep good hot/warm air coming , so I would change that, or have it changed for better heating inside. If you lift the hood & look in front of your radiator, On the engine side, you'll see a fan attached to, or in front of the radiator. It won't come on until the coolant temperature gauge gets up to proper operating temperature. Without getting in to too much detail, have your thermostat changed, and my guess is everything else will start working as it should, and whoever does the work, should know enough to check the fan operation when they do the thermostat.

Jan 28, 2009 | 1991 Mazda Protege

1 Answer

PCV Valve escort 98

it might had small hole drilled in it to help with air flow during those extreme cold tempertures

Aug 29, 2008 | 1998 Ford Escort

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