Temp Gauge Staying in the Blue; What Do I Do?

[All2kool]

So I notice while driving today that the temperature, according to the gauge, never leaves the blue mark. I disconnected what I believe was the Temperature Sending Unit, started the car, the Temp Gauge still flickered and held a line above being dead. Am I wrong that the TSU is on the passenger side of the Radiator? I mean, there is a probe stuck into the Radiator and it has a plug in it.

Popular opinion is that the thermostat must be stuck open. I've ordered a new 180 degree thermostat along with a new aluminum housing.

Until I get to the repair, is there an inherent problem with driving the car with the Temp never getting above the blue?

[witeshark]

If you can avoid driving it that cool, do it. Running too cool will cause higher emissions and may foul your O2 sensors.

[All2kool]

As luck would have it, it has started working normally again - a few hours after ordering replacement parts. I'll replace the Thermostat and Housing anyway; next time it sticks open.