It comes on after i've been driving the car for a while.
If this is a new problem, a temperature sensor may have gone bad. But if this is a new car to you, some Climate Control cars work this way.
Some will allow for Vent or Panel just to get air circulating, but the A/C should come on when you select A/C unless the outside temperature is too low.
For heater functions, the engine must warm up enough to provide heat. The Climate Control models will not turn on until it compares your temperature settings with how hot the engine water temperature is to provide this heat for you.
Now you may need to check the Antifreeze levels and check the temperature of the Radiator water to know if the Thermostat is working properly.
SOURCE: The trouble message for the ETS comes up at odd
Hi there,
The ETS stands for "Enhanced Traction System" and is GM's version of the Traction Control system. Via the engine management module, it will control wheel slippage. It uses the wheel speed sensors for the front wheels to determine wheel slippage and then cuts power as needed.
This light usually appears when the "difference" in relative wheel speed between the two front wheels is great enough, that it thinks a low traction environment is happening and cuts engine power until the speeds of both wheels are within relatively acceptable limits.
As you mentioned this light appears intermittently (especially at slow speeds), then there is likely to be a fault occurring somewhere in the ETS system.
To know for sure which circuit/component is causing this issue, you will need to query your vehicle's on-board ETS computer via the OBD diagnostics. For a small fee, your local Oldsmobile dealership (or approved agent) can check your vehicle's Diagnostic Trouble Codes (DTC's) - this only takes approx. 15mins to do. Only then, will you identify the actual component at fault.
Some speed sensors are part of the wheel hub assembly and aren't replaceable as individual parts. If you determine it is a wheel speed sensor fault, you should always check the sensor condition first - is it dirty? Is the air gap incorrect? Does the sensor's resistance (Ohms) measure within manufacturers specification? Always check these factors first, before you proceed with replacing.
If you DO need to replace, you could try TRW or other vendors for an aftermarket unit.
Good luck...
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