So I changed my thermostat the next day I went out to start the jeep and it wouldnt turn over. All the lights came on so I figured it was the battery changed that and it started fine. But the car was making a grinding noise. So I took the front end apart and put a new thermostat housing on. Got rid of the grinding noise but the cars rumbling alot. When I put the key in and turn it on just befor you start the car the engine light is blinking. It goes away once I start the car. No codes and new spark plugs anyone have any insight?