My dryer went out and neighbor gave my a older model Kenmore Heavy Duty dryer and said it worked.When I plugged it up it worked fine but it concerns me because if you look behind it while its on and running there is a red glow.If its off its not there.Ive never seen a dryer do this before is it normal to light up like that?Should it be a concern I haven't used it because fear mighht start a fire in the house.

This is an electric unit, correct? What you are seeing is the heating element. Is the back panel on this unit? If not, do not use until you get one on it. If it is on it, just where do you see the glow coming from?