Could be a shorted sensor , have you replaced it ? Shorted wiring , A problem with in the instrument cluster . Would need to do some testing to find out what causes this . I would tell you to check power an ground of both circuits involved ,could you do that ? You would need pin out charts of the connectors that go to the instrument cluster . find the wire for coolant sensor , then find that same wire color at the coolant sensor an with ohm meter check to see if wires are shorted to ground etc...
The engine coolant temperature is operated by two coils. The battery voltage is applied to both of the coils. One of the coils is grounded directly and the other coil is grounded through the engine coolant temperature sender. The engine coolant temperature sender has a resistance of 44 ohms at 125?° C (260?° F). The resistance increases at lower temperatures. The resistance is approximately 1365 ohms at 37?° C (100?° F), causing the current through the engine coolant temperature sender at one of the coils to increase, as the coolant temperature decreases and moves the pointer.
Fuel Gauge
The magnetic fields of the two coils moves the fuel gauge pointer. The two coils are at right angles to each other. The battery voltage is applied to the E coil and the circuit divides at the opposite end of the E coil. One voltage path continues to ground through the F coil, as the other goes to ground through the variable resistor of the fuel level sender.
The resistance of the fuel level sender is low when the fuel tank is low. A large flow of current passes through the E coil and the fuel level sender resistor. The current pulls the pointer towards the E on the scale.
The fuel level resistance is high when the fuel tank is full. The increased current flowing though the F coil moves the pointer to the F on the scale. With the two coils operating the pointer, the fuel gauge is not affected by the any changes in the voltage of the system.
Without being able to test the electrical circuits , I would say there is a problem inside the instrument cluster. You could take it out an have it tested or you could get a used one from a auto salvage yard for $15.00 an see if the problem goes away .
With
SOURCE: 1995 Pontiac grand prix's temp gauge goes hot
check to see if the electric fan is coming on when it should. Also check coolant level. Also, you may have the beginning of a plugged radiator If all else is OK flush radiator out.
SOURCE: dash lights
You will have to replace the light bulbs. In order to do this, you'll have to take apart the cluster and radio to get to them. Visit www.oqcgp.net to search for fixes to common grand prix problems
SOURCE: 1992 Pontiac Grand PrixPower loss,erratic idle
spark plug gaps are very critical on computerised cars!! [some wont even start!]
distributor module may be breeaking down as temp rises they fail!
otherwise do compression check as it may have valve problems
also check plug leads & injectors aswell as the fuel pump pressure [ could bestarving for fuel]
SOURCE: I have a 1997 Pontiac Grand Prix air temp sensor may be bad
the air sensor yur thinking of is usually found out front of the car on the post that supports the hood latch betwween the radiator assemblies and the oute decorative grill. go to your auto parts store like autozone and ask for the ambient air temp sensor. then if they can, ask for a diagram of its location. Its real easy to replace usually one bolt and one wire clip. Autozone has /offers these do it yourself repar guides that can help you .
SOURCE: location of the radiator drain plug for 2001 Pontiac grand prix
doesnt have one ,remove the bottom hose
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