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'05 Grand Am 3.4 V6 Temp Gauge not Working all of a sudden.

Just did a cylinder head job on my 05 Grand am. Got everything put together. Drove it two days and all of a sudden the temp gauge dropped to 100 and sits. Both fans are running full speed. I changed the Temp Sensor and the same is still happening. Thermostat is only 2 weeks old. Is there a fuse? Is it the Thermostat? Temp sensor? Any suggestions?

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  • Stephen Sickels
    Stephen Sickels Apr 07, 2015

    No check engine light. Coolant was at the top of the whole when I changed sensors last night.?? Would the computer need to be cleared? It is possible that I have a bad sensor as it was one I had in a previous vehicle.



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Sounds like a temp sensor or wiring problem.
You may only have one sensor for both the gauge and the engine computer.
If the computer temp sensor fails, or is not sending a signal to the engine computer, the fans will run as a precaution to keep the engine from overheating.
If you have replaced the correct sensor, it could be a wiring problem, or the engine coolant could be low enough to not touch the sensor.
If the coolant sensor is not sending a signal, the check engine light should also be on.

Posted on Apr 07, 2015

Testimonial: "Quick Clear answer. Thanks Stephen for your help."

  • Stephen Sickels
    Stephen Sickels Apr 07, 2015

    No check engine light. Coolant was at the top of the hole when I changed sensors last night.?? Would the computer need to be cleared? It is possible that I have a bad sensor as it was one I had in a previous vehicle.

  •  Stephen
    Stephen Apr 07, 2015

    I would want to know what the sensor is sending to the computer. I have a scanner that would tell me if the sensor is working. If you unplug the sensor, the check engine light would come on, and the fans would run. So if the fans are running, and the light is not on, something is not right. You could have a faulty sensor, or perhaps the wrong sensor. In years past, you would have two, one for the gauge and another for the engine computer. You might try unplugging the sensor and see if the check engine light comes on.



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I need the easiest possible directions to replace the coolant temperature sensor in my 1999 Chevy Lumina ltz 3.8 v6 car please.

The coolant sensor temperature is usually found just beneath the cylinder head, on the engine block.

You just disconnect the 1-2 wires and then undo it with a wrench.
The sensor will look like one of these:
1999 Chevy Lumina ltz 3 8 v6 coolant temperature sensor Google Search

Just be aware .. you may have TWO such sensors on your vehicle.

One sensor (usually with 3-4 electrical pins) is near the thermostat and works in conjunction with other sensors to regulate fuel/air according to engine temperature.

The other type of sensor is in the block near the cylinder head. It sends a signal to the temperature gauge on your dashboard ONLY. If your temp gauge constantly reads too hot or too cold .. this one is the culprit.25939754-r0ibht2u2t2rhetbyfvb2pry-5-0.jpg
If it's a running fault .. speed .. rough running .. fuel. It may look like this:

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ok , but no engine stated. which one>??
hot = lying dash gauge or real hand held pyro IR gun? a $20 tool.
did the scan tool ECT reading show too hot, Yes/no.

no new cap, really?
is the cam timed right?
is the spark timed right.?
is the ECU stuck in limphome mode? (huge heat to cylinder walls)
thermostat not upside down.
or thermostat not with bleed hole up hill trapping air below
making it lie and the dash gauge lie too, (the gauge can not measure air, period)

id not do squat with no IR gun. not me. its super accurate too.
and dirt cheap and saves burned hands,
and finds clogged rad tubes saving useless $250 new rad.
one tool. use it. and win.

i this this dang I6 engine, that loves to trap air?
had 3,now, over 500k miles on them. 1988 to present.
and never overheated but once, pin hole in heater core hose
ran bypass and drove home.
i have a 08 wrangler 6sp, 3.8L v6 , nice rig. easy to fix too.

there are 2 parts. (3 really)
engine make too much heat, (limphome or timed wrong)
air in system.
cooling system.

the rad pressure test pass and the green/blue test passes

no water in engine oil
no oil or carbon seen in the engine coolant , all places look.

how hot, ??????
numbers matter, in all ofscience. they talk to you.
at what exact temp did the fans, kick in,?
the FSM shows you this, and how to do that. how to make sure the
fans kick in happen, RIGHT. some are 2 staged with A/C.
not just kick. (when)

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