Pontiac Problems? Ask a Mechanic for Answers ASAP
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
This fault here is usually caused by the gauge stepper motor itself failing in the instrument cluster needing replaced or repaired. One way to check this is locate the engine coolant temperature sensor and unplug it as this would put it into a negative reading which should make the gauge go to 0° or the very bottom. If it still reads 220° the cluster itself needs removed and repaired or removed and replaced.
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