I suspect the thermostat has gone bad in my car. Also, I am having trouble accelerating, even though the Check Engine Light is not coming on.
It is possible that your brakes may be stuck. If this happens, you will have trouble accelerating, and there will be no Check Engine Light. I would ask for assistance from one of the mechanics at YourMechanic to come to you, and check over your vehicle for your concerns, so that they can repair what is causing your thermostat problems.