My understanding is that many cars are programmed this way - to stay out of overdrive until up to temperature. The purpose is to get them to closed loop faster - i.e. fuel economy. I might be wrong, and its certainly not true of all vehicles.
My understanding is that many cars are programmed this way - to stay out of overdrive until up to temperature. The purpose is to get them to closed loop faster - i.e. fuel economy. I might be wrong, and its certainly not true of all vehicles.