Dash gage tachometer and heat (sometimes the speedometer) are not working. They have wrapped themselves all the way over to the right and are not moving. The car has never been hot and has never exceeded normal operating speeds.
You will have to change the whole dash unit from the sound of it ,its a mini computer behind it
SOURCE: i have a 2005 pontiac sunfire the car is exceeding
Cooling system might need flushed. About $120 any car service center.
Step two
Is the car over heating if it has 60,000 or more miles you might need a water pump, or might need a thermosat or both. If you are going to flush the system put a water pump and thermosat in it. Removal of water pump and stat are easy just take a picture of it before you do it so you know where everything goes. Scale 1 - 10 I rate it a 4 for being difficult. If you can't do it yourself or some who knows what they are doing you might have to take it to service center which would cost about $300 - $400 dollars.
SOURCE: I have a 2004 Pontiac
Sounds like your cooling fans on the radiator are not working. The fans are activated by a thermol switch on the engine or radiator reading the coolant temperature and an A/C switch. When the coolant is too hot the fans should activate cooling the system down. And, when the A/C is on the fans should also activate in order to cool the condensate so the A/C would work.
When you are driving, the movement of the vehicle throught he air is providing enough air flow to keep things cool and functional.
I would check the radiator fan fuse or fuses first. If those are OK I would try to run the fans with 12 volts and a ground that I supply just to see if the fan motor(s) actually run when powered. If the fan don't run when powered then the fans are bad and will need to be replaced. If the fans do run when you power them manually, then something is not allowing the power to activate, like a relay, control unit, or wiring.
It will take a little diagnostics, but it is not too difficult to chase it down.
SOURCE: I have a 1998 Pontiac
it could be a blown fuse, check the fuses in the fuse box.........cheers.
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