I had my Kia Sedona almost a month now. I feel heat without having my heater on around my legs & feet. There's a slight rumbling I feel through the floor & seat. It has about 68.something thousand mile on it now. Sometimes I hear sounds loud enough to hear over music playing. I had a auto mechanic to look at it, he said by listening & driving, he could not detect anything. But I did not notice any issues the first few days of purchased. No lights have came on indicating a problem. My question is there a need to be concern from my findings?