My guess would be low coolant, when you open the valve to let coolant into the heater core, the level drops in the radiator below where the temp sensor is, if is not in coolant, then the sensor is reading steam which is hotter than coolant. If this is the case, it can pose a dangerous situation, steam in the coolant system builds up pressure, if you remove the radiator cap while it is hot, coolant will spray everywhere causing severe burns. Let the car cool down completely, like overnight. then remove the cap and check the coolant level, it should be full to the top. My other guess would be if the coolant is low, the headgasket is the culprit.
http://schematicsdiagram.blogspot.com/2011/12/fuel-gauge-jumps-from-empty-to-full.html
--------------
•
Oldsmobile Temperature Gauge Lamp Switch?
-----------------
http://technoanswers.blogspot.in/2012/02/dodge-neon-gauges-not-working.html
------------
http://schematicsdiagram.blogspot.com/2011/12/temperature-gauge-went-up.html
------------
http://repairhelpcenter.blogspot.in/2012/02/how-to-replace-instrument-panel-and.html
-----------
http://technoanswers.blogspot.in/2012/02/how-to-remove-instrument-panel-on.html
-----------
If
all voltages checked ok, then most probably its faulty instrument cluster board
on which gauges are connected. Yes if cluster circuit board looks ok, then also
it can be faulty. Somewhere there is minute short or burn on board then such
problem arises.
Also
check the fuse box. One under hood and other under dash.
Inspect
each and every fuse and see if all are fine or not.
---------------
For
more troubleshooting on these cluster gauges I suggest you to refer the list of
help links mentioned below. Its step by step instructions will help you to
confirm the exact cause of problem in these conditions: ---------
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
--------------
2005 Lexus SC430: Fuel Door, Dome light and Fuel Gauge Fuse
Location?
http://howtobyme.blogspot.in/2012/05/2005-lexus-sc430-fuel-door-will-not.html
----------
Toyota 4Runner:
Temperature Gauge Sensor
http://technoanswers.blogspot.in/2012/04/toyota-4runner-temperature-gauge-sensor.html
------------
Temperature gauge sits over half way mark?
http://schematicsdiagram.blogspot.in/2012/04/temperature-gauge-sits-over-half-way.html
---------------
Heater blows intermittently and temp gauge goes erratic?
http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.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
-----------
2003 Pontiac
Grand Prix: Erratic Fuel Gauge?
http://technoanswers.blogspot.in/2012/06/2003-pontiac-grand-prix-erratic-fuel.html
-----------
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
---------------
Fuel gauge jumps from empty to full?
http://schematicsdiagram.blogspot.com/2011/12/fuel-gauge-jumps-from-empty-to-full.html
--------------
Gas gauge stuck on empty on 2002 Mercedes Benz 240c?
http://repairhelpcenter.blogspot.in/2012/02/gas-gauge-stuck-on-empty-on-2002.html
---------------
• Oldsmobile
Temperature Gauge Lamp Switch?
-----------------
Fuel gauge drops to Empty?
http://technoanswers.blogspot.com/2012/01/fuel-gauge-drops-to-empty.html
----------------
Dodge neon gauges not working?
http://technoanswers.blogspot.in/2012/02/dodge-neon-gauges-not-working.html
------------
Temperature gauge went up?
http://schematicsdiagram.blogspot.com/2011/12/temperature-gauge-went-up.html
------------
Temperature gauge stays At cold on jaguar?
http://technoanswers.blogspot.in/2012/02/temperature-gauge-stays-at-cold-on.html
-----------
How to replace Instrument panel and dashboard on Toyota
car?
http://repairhelpcenter.blogspot.in/2012/02/how-to-replace-instrument-panel-and.html
-----------
How to remove instrument panel on Chevrolet car?
http://technoanswers.blogspot.in/2012/02/how-to-remove-instrument-panel-on.html
-----------
How to remove control panel on Buick regal?
http://howtobyme.blogspot.in/2012/02/how-to-remove-control-panel-on-buick.html
---------------
These
details will help.
Thanks.
http://howtobyme.blogspot.in/2012/05/2004-toyota-tundra-oil-gauge-and-temp.html
---------
Toyota 4Runner: Temperature Gauge Sensor
http://technoanswers.blogspot.in/2012/04/toyota-4runner-temperature-gauge-sensor.html
-----------
Temperature gauge sits over half way mark?
http://schematicsdiagram.blogspot.in/2012/04/temperature-gauge-sits-over-half-way.html
----------
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
-------------
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
----------
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
-----------
Dodge neon gauges not working?
http://technoanswers.blogspot.in/2012/02/dodge-neon-gauges-not-working.html
---------
Heater blows cold?
http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html
----------
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
-----------
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
-----------
These details will help.
Thanks.
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