94 C280 with only 51k miles. I've had it for 6 months with no problems -- it is in great shape.

It is pretty cold the last 2-3 weeks (30ish) and I have an odd problem.

Sometimes my temp gauge works and sometimes it doesn't. It will typically be pegged at the bottom. Most of the time at some point in the ride it will suddenly rise up to where it should be. At that point it stays active until the problem reoccurs at a later starting.

1. I have no heater problems (stuck thermostat -- heat works perfectly).
2. I have no engine overheating problems. It never runs hot, and never is at any higher temp than normal when it does decide to work.
3. Coolant is at the proper mix for winter.

Any thoughts or suggestions?

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