MY HOT AND COLD METER KEEPS RISING AND FALLING

possible no water in the engine and it is overheating
this is indicated by the temp gauge rising and falling
temp gauge sender units need to be immersed in water full time to get a reading so if it goes up that is in water and when it falls back that is in nothing or steam
hot engine would account for hot floor

engine - Car temperature displaying below Cold or just ...

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Jun 25, 2012 - Today I was boiling inside my car as it was a very hot day and my ...cold, it almost never goes up to even 1/4 of the temperature gauge, the ... Where I live, it's hot enough that even with the thermostat wide open the engine won't stay at C.. ... How to Match Skin Color Between Pictures Of The Same Person In ...

What does it mean when my car's temperature gauge is halfway ...

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Aug 23, 2011 - I think my temperature gauge is usually all the way to the left, which I think is "cold" (okay). ... before steam poured from under the hood of my car and I had to pay $217 ... Why does my A/C stop blowing cold & my temperature gauge goes toHOT? ... But the battery won't keep a charge after sitting over night. my temp gauge always stays on cold. never moves.? ' Yahoo Answers
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Sounds like an air lock. There shotld be a release screw on one of the hoses

was the pressure gauge connected to the discharge side or the suction side of the compressor
if you have it connected to the suction side , you have excessive gas in the system

My first question would be, do you know if the cooling fan is coming on ? ?
The computer can shut down the engine if it reaches 250 or 260 degrees. You could also have a coil or other electrical part that is failing when hot.

No heat is meaning the coolant isn't circulating, so it could be a few things.

1. Thermostat stuck closed (Most Likely)
   
2. Water Pump leaking
   
3. Clogged Heater Core
4. Intake Gasket Leaking Internal or External
5. Head Gasket/Gaskets leaking external .. If its internal there would be big piles of white milky smoke
   

hi,
i actually used to have a 1995 pontiac grand am that did the same thing....only difference was i didn't have to restart the car....usually what i would do was drop the car in neutral and gas the car and i'd notice my temp gauge go down and my heater gave heat.....chances are it's a sticky termostat. Hopefully that helped.

Replace bad thermostat.

Good luck

remove the radiator cap and let the car run for 30 minutes to let the air out of the heater coil, these radiator caps on the 2008 Impala will not bleed off, while running notice if air bubbles air slowly rising to the top of the radiator cap, re-install cap and see if this fixes problem, we also purchased a new radiator cap, this fixed my wifes car.

water pump