On my 02 pontiac Aztek the temperature gauge rises pretty quickly when stopped at a light or sitting for a few minutes, but as soon as I start moving again the temp falls back to normal about 1/2 way up the gauge. I have noticed that the cooling fans do not seem to come on, I have let the gauge raise to about 3/4 and the fans do not come on. If I turn on the A/C both fans come on and stay running. So far It has not overheated and I would like to keep it that way. I am ASSUMING the temp sensor might be going bad as is seems to cool back down indicating the thermostat is functioning, also the heater works fine indicating it is circulating fluid properly. so I am thinking it is just the sensor and am curious where the offending sensor located?
There are 2 different circuit that control the cooling fans.
The engine controller turns the low speed fan circuit on to control temperature and turns on the high speed fan circuit if the engine and A/C is running.
It sounds like your low speed fan function is not working.
Find your fan 1 fuse located in the under hood fuse panel and make sure it is not blown. If OK go to next step.
Find your fan 1 relay located in the under hood fuse panel. Find another relay in the fuse panel that matches and swap the two. If the fan then works you know you have a bad relay.
If both are check good, let me know and we will go from there.
Below, I have attached the wiring diagram for your cooling system, hope it helps.
Regards,
If you check in your power distribution box under hood, I believe relay # 2 is a rad fan relay, that could be a possible problem too. If other relays in the area are same number & 5 pins, or whatever yours is, you can try swapping them for testing it.
http://schematicsdiagram.blogspot.com/2011/12/fuel-gauge-jumps-from-empty-to-full.html
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Oldsmobile Temperature Gauge Lamp Switch?
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http://technoanswers.blogspot.in/2012/02/dodge-neon-gauges-not-working.html
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http://schematicsdiagram.blogspot.com/2011/12/temperature-gauge-went-up.html
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http://repairhelpcenter.blogspot.in/2012/02/how-to-replace-instrument-panel-and.html
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http://technoanswers.blogspot.in/2012/02/how-to-remove-instrument-panel-on.html
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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.
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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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