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If your "Check Gauges" light is on, the light means pretty much whay it says...CHECK GAUGES! One or more of your gauges is/are reading outside of normal operating range. You could be having an overheating problem (Temperature gauge near or in the red) You could be having a charging system problem (Battery or Amp gauge reading in the "discharge" or "low voltage" area.) You could be nearly out of fuel (Fuel gauge reading near empty) Your oil pressure could be low (OIl Pressure gauge reading very low)....You have to look at your gauges to find out what is going on that is not normal.
If the coolant level (antifreeze) level is low there may not be enough fluid in the system for the temperature sensor to register a proper reading ( think of it as holding an oral thermometer just outside of your mouth).
Insufficient fluid passing through the heater core (small fan that blows through a small heated radiator) may not be enough to produce heat.
However: At increased speeds the engine may be heating what little fluid there is to a point to supply heat to the heater core, and register on the temperature sensor.
The problem is a bad ambient air temp sensor or a broken wire to that sensor. The sensor usually is located in the front of the engine bay on the support for hood latch, between the outer grill and the radiator/condensor assemblies.
For general awareness, the outside air temperature sensor is located above the inside mirror. Try to reset the temperature measurement unit:1. Switch engine on.2. Press and hold clock minute (min) and hour (h) buttons simultaneoutly longer than 3 seconds. The display will show new temperature measurement unit.