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Temperature gauge fluctuates up and down.. smell antifreeze .. no leaks.. cools down when driving heats when sitting still

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 2003 Pontiac Montana antifreeze smell?

Bad News. I recently had the same type of smell ( no leaks or puddles either) coming from my van and had to have the intake manifold gasket replaced due to the Dex-cool issue. It appears GM installed an inadequate/substandard gasket when they built the van. My van only had 65,000 miles on it. There's a Dex-cool settlement you could have applied for but repairs had to be made by May of 2008.

This is the only real complaint I've had with the van.

Posted on Dec 09, 2008

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SOURCE: My 2001 Jeep Grand Cherokee's

You may have a stuck closed thermostat or the impeller has failed on the water pump.

Replace them both. You never trust a stat that has gotten hot, and there is no sure fire way to test. You can take it out, put the car back together and see if the engine still gets hot to determine if it's the stat, or the water pump, but once you do all that, you might as well just replace them both.

You also need to make sure the radiator is not all slugged as well, and make sure the radiator cooling fans are both working.

There is a cooling fan relay that is prone to failure as well. Mine did in my '03 Jeep Cherokee. It's located behind the right headlight, and requires that you remove the headlight, drill a hole in the plastic shield, and replacing the relay. You can get a new one at the auto parts store. For more detailed instructions, go to www.wjjeeps.com

Posted on Jan 29, 2009

  • 285 Answers

SOURCE: antifreeze ts boiling back into reservoir.

it sounds like a possible head gasket problem,you can get the fluctuation from combustion gases getting pumped into your cooling system and creating gas pockets,i would suggest taking it to a shop and have them do a block test to look for combustion in the cooling system to confirm the problem,that way you will know for sure,if it comes up negative they can also perform a flow test to make sure there is no restriction in the cooling system such as a plugged radiator or a bad thermostat,hope this sheds a little light on it

Posted on Sep 12, 2009

Testimonial: "I bet you've hit on the problem ! Car has been "using " antifreeze for a couple years now, with no leaking anywhere. Lost through the head gasket ?"

fingaz22
  • 1068 Answers

SOURCE: Heat/Temperature gauge

the temp sensor sounds like it maybe bad and not responding the way it should.they are cheap 10 - 20 dollars and easy to replace.

Posted on Dec 16, 2009

  • 398 Answers

SOURCE: Temperature gauge fluctuates

First of all you have a bad heater core that needs to be replaced. Second you may have a bad temperature sensor. Make sure the radiator if full of water

Posted on Jan 19, 2010

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Erratic temp gauge - strong smell of antifreeze - temp light comes on flickers goes out. really hot air coming through heater vents.


have the alternator checked for out put. have a pressure test done on the cooling system to check for leaks The fluctuating temp gauge may be the boiling water gushing past the sender bulb .

Mar 02, 2014 | Buick Century Cars & Trucks

1 Answer

Temperature gauge fluctuating on 2005 Impala


you have a common problem that all GM cars and truck have,and that is leaking intake manifold gasket. here is a picture of a bad intake manifold gasket out of 2005 pont bonnville with very low miles12_27_2012_8_32_41_pm.jpg12_27_2012_8_32_44_pm.jpg

Dec 27, 2012 | Chevrolet Impala Cars & Trucks

2 Answers

Heat gauge goes way up,then by reeving motor it will go down.blows cold air


Check out related help links with solutions to troubleshoot the problem:---
Click the link below:---
2004 Toyota Tundra: Oil Gauge and Temp Gauge Not Working?


http://howtobyme.blogspot.in/2012/05/2004-toyota-tundra-oil-gauge-and-temp.html

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Toyota 4Runner: Temperature Gauge Sensor http://technoanswers.blogspot.in/2012/04/toyota-4runner-temperature-gauge-sensor.html

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Temperature gauge sits over half way mark? http://schematicsdiagram.blogspot.in/2012/04/temperature-gauge-sits-over-half-way.html
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Heater blows intermittently and temp gauge goes erratic?


http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html
------------- No heat on Oldsmobile Silhouette? http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html
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Temperature gauge does not move and no heat when heater is ON? http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html
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Temperature gauge keeps fluctuating up and down close to red? http://technoanswers.blogspot.com/2012/01/temperature-gauge-keeps-fluctuating-up.html
----------- Temperature gauge on the dash quit working on Pontiac Grand Prix? http://technoanswers.blogspot.com/2012/01/temperature-gauge-on-dash-quit-working.html
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Dodge neon gauges not working? http://technoanswers.blogspot.in/2012/02/dodge-neon-gauges-not-working.html

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Heater blows cold? http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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Heat blows cold on drivers side and hot on passenger side? http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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1992 Lexus LS400: Engine overheats, Antifreeze out of reservoir and heater Blows Cold Air? http://whatisbyme.blogspot.in/2012/05/1992-lexus-ls400-engine-overheats.html

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These details will help.
Thanks.

Nov 22, 2012 | 1997 Ford Taurus

1 Answer

Gas Gauge fluctuates, Overheating even with enough antifreeze & Heater blowing freezing cold air.


GAS GAGE IS EITHER A BAD SENDING UNIT OR "SLOSH MODULE" IF A FORD. HEAT ISSUE IS A VACUUM LOCK IN THE COOLING SYSTEM AND NOT ALLOWING THE AIR TO ESCAPE AND NO WATER TO CIRCULATE.CHECK FOR LEAKS ,THE THERMOSTAT,AND WATER PUMP FOR PROPER CIRCULATION

Oct 09, 2012 | 1997 Mercury Mountaineer

1 Answer

My freestar temperature gauge keeps reading that it is over heating. It does not smell hot and I do not smell antifreeze. As soon as I come to a stop, even with the engine still running the temperature...


Sounds as if fins are worn on waterpump. A pump doesnt need to leak or you to smell it for it to be bad. My bets waterpump, 24 yrs as a ford senior master behind this thought...

Oct 28, 2010 | 2006 Ford Freestar

1 Answer

2004 cheverolet impala 3.4L engine - Started running hot. Had never changed antifreeze, bought a flush and refilled with antifreeze. Ok for several weeks, started running hot again. Replaced the...


Sounds like you have an air;lock in your cooling system.Try placing a bleeder on the return hose to the heater core ........looks like a small tap

Aug 18, 2010 | 2004 Chevrolet Impala

1 Answer

Temperture fluctation


Generally the temperature fluctuates due to a leak in the cooling system.

The cooling system operates similar to a pressure cooker, with everything sealed, for each pound of pressure on the system, the engine can increase the temperature above the boiling point by 7 degrees without boiling. This is why when a hose breaks, the temperature gauge generally goes all the way up & you will hear boiling if you open the hood & inspect the area as it occurs.

If you lose a pound (more or less) of pressure, even with antifreeze, due to the pressure the system is under, the temperature will rise.

So, when there is even a pin hole sized leak, a gasket that occasionally leaks, a radiator cap that isn't actually holding the correct pressure-all of these things will cause the pressure to drop & an immediate change in the temperature making it hotter and as it re-seals itself, the temp will decrease again. There are a lot of particles floating through your cooling system and these particles sometimes will plug a leak until pressure pushes it out later.

Generally a leak is iindicated by the temp gauge rising higher than ever before. To resolve this, a pressure test will be necessary unless you replace the radiator cap & find it is no longer fluctuating.

Also, this doesn't have to happen each time you drive. Seals leak when they want to & that's all I can say about that. Usually they will reach a point where they will want to leak all of the time but finding them has to be done while they are in fact leaking.

good luck

Feb 11, 2010 | 2005 Ford Explorer Sport Trac

1 Answer

Smoke coming out vents when defrost is on and temp gauge goes up and down in 1994 Taurus


The fluctuation in the temp gage indicates a low coolant situation. The smoke you see from the defroster vent is actually antifreeze that is leaking from the heater core somewhere and as the antifreeze evaporates from the heat it causes a vapor to produce. You should smell a very sweet smell when you see the vapor. If so it is definitely antifreeze. Find the leak and fix it. Then refill your coolant system to specs and you should be good to go.

Aug 21, 2009 | 1994 Ford Taurus

2 Answers

I can smell a burning smell after my car has been running. the last few days i can hear the fan running constantly while i'm driving and when i come to a stop or slow down the temperature gauge moves up to...


When the engine is cool, check the fluid level in the radiator. If low add 50/50 solution of water and antifreeze. Do not continue to drive your car until this is fixed or you could cause a lot of damage to the engine.

Jul 08, 2009 | 2006 Mazda 6

3 Answers

Antifreeze smell


If u smell the antifreeze inside the car, the heater core needs to be replaced most likely. It is leaking inside, and will get worse, to the point of 'fogging up' the windows inside.

Oct 29, 2008 | 1984 Porsche 944

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