The lights come on when you put in key to show you they are all working. Once you start they should go off. Keep an eye on it just in case but it should go off.
If not reset the system by disconnecting the batt. neg cable for 5 min and put it back that should clear it
Mike
SOURCE: possible overheating, 2004 pontiac montana
Its definitly a bad reading, you would know if your vehicle is overheating, you can usually smell it right away.I would say its your temperature gauge sending unit is defective, check the wires to see if they are well connected or broken. ask a backyard mechanic for assistance.
SOURCE: how to reset the change oil light in a 2001
turn the key on to the power position but do not start the vehicle, then press the accelerator pedal to the floor three times within a ten second period.
Good luck dont forget to rate
SOURCE: temp gauge often reads too hot, engine normal.
It sounds like your cooling fans are not comming on by themselves, but when you turn on the ac it forces them to turn on. Make sure relay is good, then replace coolant temp sensor, this may have failed no telling pcm to turn on cooling fans. Thanks
SOURCE: 2001 Montana - temp guage does not move - engine check light on -
This can be a sign that your coolant level is not adequate. It can also be a sign that your Temp Sending unit is bad. Oviously the first thing I would do is to go through the coolant level check of pulling the radiator cap (on a cold engine) and adding a mixture of 50% anti-freeze, and 50% distilled water until the coolant fills to the top. I typically run the engine with the radiator cap off until it gets to or close to full operational temperature (typically 190-210). When close you should see that the level has dropped after the thermostat has opened and circulated the coolant. Add additional fluid until the level stabilizes at the top again. Once it stablizes at the top replace the radiator cap. Check and make sure the temp gage is reading normal operating temperature. If you only have a light make sure it is not illuminated. You should know this better as you are used to driving the vehicle. If there is still in indication problem then look at other things like the temp sending unit. This is normally found screwed into one of the cylinder heads with a wire coming out of it. One way to check it is an ohmeter to the connection terminals. They don't cost but $15-60 dollars.
There are others issues that can be going on like a bad/worn or broken water pump drive belt (accessory drive belt, serpentine belt), or a bad water pump generally noted by coolant leaking out of weap hole on the bottom near the input drive where the pulley is at. There are other issues that could be causing this, but we won't go into those here (assuming your vehicle hasn't shown more serious indicators).
SOURCE: NOT SHOWING TEMP ON GAUGE,ENGINE LIGHT IS ON,FANS
You may want to check out http://www.obd-codes.com/p0128 it has some good info on your problem.
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