Low Coolant?
Weak Temerature sensor?
Weak gauge
Gauge working properly and recording the thermostat opening and closing as engine temperature fluctuates
The temperature gauge on a car fluctuates because the car's thermostat is opening and closing. The gauge goes up when the thermostat closes and the gauge goes down when the thermostat opens.
Because it is a Pontiac. Sorry, man.
Temperature gauge may drop when heater turned on because additional coolant from heater core is introduced to cooling system - usually this coolant is cooler than what is currently circulating
Most likely cause is a faulty coolant temperature sensor.
Sounds like it is low on coolant.
When you turn a corner the guage fluctuates.
Your pressure gauge may be broken....If it fluctuates, then you know its not your gauge, but if your gauge always reads 80, it may need to be replaced.
because your thermostat is opening and closing as the engine temp. fluctuates
Could be low on coolant or a faulty thermostat.
replace temperature gauge
Fuse location for temperature gauge for a Malibu
The gauge is part of the fuel pump/float assembly within the gas tank. It is probably a $500.00 repair. It is harmless.