There is a gurgle sound when I accelerate

A sound like that (without being able to hear it myself) would lead me to believe your antifreeze/coolant is low and you are hearing the air pockets pass through your heater core. Make sure your coolant is full and there is no air trapped in the coolant system which includes your heater. The overflow bottle should be filled to the proper level and free from any leaks. some vehicles require a special procedure for filling and bleeding the air from the engine coolant system so be sure to follow any procedure outlined for your vehicle.