THERMOSTAT AND FUEL GAUGE PEGGED HOT AND FULL

Asked by Sep 21, 2014 at 03:06 PM about the 2002 Saturn L-Series 4 Dr L300 Sedan

Question type: Maintenance & Repair

STARTED THE CAR ONE DAY AFTER IT WAS ONLY RAN A COUPLE MINUTES
(CAR WAS NOT OVERHEATING) CAR WENT FROM EMPTY ALMOST TO
COMPLETELY FULL, THE THERMOSTAT LIGHT CAME ON AND THE
THERMOSTAT GAUGE WAS PEGGED HOT.... PUT SCANNER ON IT AND IT SAID
ERROR CODE U2105 PLUS THE EGR AND EVAP SYMBOL WAS FLASHING

THIS CAR WILL START SOMETIMES BUT NOT ALWAYS, TO GET TO START I
HAVE TO DISCONNECT AND RECONNECT THE BATTERY CABLE FOR THE CAR
THEN IT MAKES A LOUD HIGH PITCH NOISE UNDER THE HOOD AND STARTS
RIGHT UP.

WHAT DO I DO ???? AND IF IT IS A STUCK THERMOSTAT DOES THE INTAKE
MANIFOLD NEED TO COME OFF???

1 Answer

72,345

Sounds like you have a wire for the instrument cluster that's shorted to ground. In other words a bare spot on a wire is touching something metal and forcing the temperature gauge to hot and the fuel gauge to full. It could also be a bad printed circuit on the back of the instrument cluster. HTH. -Jim

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