Question about 1992 Volvo 960

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Temp gauge on dash fluctuates up and down

1992 k1500 suburban 4x4 temperature gauge fluctuates up and down but so far not in the 'overheat' zone. I installed a new thermostat and temp. sensor hoping to solve the problem but it did not change anything.

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There is an air pocket in the coolant (upper engine underneath the manifold). Some GM manifolds have a defective design that allows the coolant to leak from underneath the throttle body assembly inside the manifold. This can contaminate oil (check for caramel milkshake color on dipstick), and cause air pockets to form underneath the sensor---thus the erratic signal.

Posted on Mar 26, 2009

  • Glenn Spruille
    Glenn Spruille Jan 05, 2014

    how do i get rid of the air pocket

  • Glenn Spruille
    Glenn Spruille Jun 05, 2014

    I parked on a incline and ran my truck for 20 minutes, topped it off as needed, but still I have the fluctuation, .

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3 Answers

Why does my temperature gauge keep going up and down


An accurate temperature gauge will always fluctuate because the temperature in the engine fluctuates.

Usually the only time this is really noticeable is when the engine has been working hard and suddenly has to wait at a junction or similar and the gauge can rise considerably.

You didn't mention by how much the gauge fluctuates?
As long as it remains approximately in the normal zone it is acceptable but if it climbs into the hot zone or falls into the cold zone it is not acceptable and the cause should be investigated as soon as possible.

May 02, 2016 | 2008 Peugeot 308 1.6

1 Answer

My 95 chevy suburban 5.7 temp. gauge fluctuates from operating temp 195 to 170 back to 195 as I drive


there are two things that can be wrong here.
1-wiring or the sensor itself may be bad.
2-you have a bad head gasket(not blown all the way)but starting to go therefore the fluctuation on the gauge itself.
does it go down when you give it gas? does it uses coolant with out leaking? let me know

Oct 14, 2013 | 1995 Chevrolet Suburban

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

2 Answers

1990 dodge dakota 2.5 over heats temp gauge erratic


For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----

temp gauge goes erratic? http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.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

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Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------

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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This details will help.Thanks.

Feb 07, 2012 | 1990 Dodge Dakota

1 Answer

My truck started running poorly as the temp outside has gotten colder. It runsmeans poorly tillas operating temp. Then atu opp temp Iit trys to die at stop lights. I had replace plugs/wires/ fuel...


You have a Cold starting sequence that is similar to a choke. This system relies on getting a temperature signal back to the Computer. It should have at least 1 water sensor. Sometimes there are 2 sensors with one working the dash gauge and the other working the Cold start sequence. If you find 2 sensors just unplug 1 at a time and do this when the engine temperature has been rising. When you find the dash gauge sensor you will lose the reading on the dash gauge when it is unplugged. The remaining sensor would control the Cold start sequence, so replace that sensor.

Dec 04, 2011 | 1992 GMC Sierra K1500

1 Answer

I have a 92 honda accord that overheats because my fans dont turn on. i know they work because when i turn the a/c on they turn on, but other wise they dont. ive replaced the thermostat and have had no...


Check for a faulty engine coolant temperature switch. This is the switch that talks to the cars computer and the fan relays. (It is NOT the same as the separate coolant temperature sender which is what sends the temperature to the coolant temp gauge on the dash instruments.) If the engine coolant temp switch is stuck open or in the cool mode, it may not trigger the fan relays. Meanwhile, your coolant temp on the dash gauge will look normal.

Jan 18, 2011 | 1992 Honda Accord

1 Answer

Fluctuating engine temp a/c sends out cold air intermittently


Here's the thing. The ECU will shut down AC if the engine temperature is too hot. If the coolant temperature sensor is malfunctioning (lying to the ECU) telling it that the temperature is hotter than it actually is, the computer will turn the AC OFF.

Sep 11, 2009 | Hyundai Motor 2003 Elantra

1 Answer

How do I diagnose a bad thermostat or temperature sender unit on a 94 Cherokee sport 4.0L? Once the vehicle warms up, the temp gauge on the dash fluctuates from 210 (center of the gauge and normal...


You can remove the thermostat and put in a pot of water and boil it.(should open near the stamped temp on yours, 195f) From what you have posted, ti seems that you have a partially obstructed radiator core and at present, it's just bad enough for the electric fan to deal with it. (you can actually see that the temperature fluctuations happen when the fan is on and off) If you do not clean out the radiator, eventually the fan will not be enough to lower the temp and it will begin to actually go into overheat.

Jun 07, 2009 | 1995 Jeep Grand Cherokee

1 Answer

Temp gauge on dash fluctuates up and down and stays at times red.


Check your cooling fans to insure they are working to cool the radiator...

Apr 05, 2009 | 1996 Volvo 960

2 Answers

1995 Jeep Cherokee Country 4x4 - Truck continues to overheat a short while after starting. Have replaced radiator, thermostat in line, & flushed system unti it ran clear. Added new antifreeze and...


Try changing your temperature gauge (temperature switch). It's located right next to the thermostat (at least on my 1992 it is)

"The temperature switch supplies engine coolant temperature data to the MCU. Until the engine is sufficiently warmed (above 135°F/57°C), the system remains in the open loop mode of operation (i.e., a fixed air/fuel mixture based upon engine rpm)."

Aug 09, 2008 | 1995 Jeep Cherokee

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