Hi Dot, just seen your post, it seems from your post that you have left the coling systen either go very low on water/Antifreez or your systyem was frozen to indicate that the temp Gauge was going into the red, the indication of low coolant level will be your heater is also indicates an air lock in the system, get it sorted ASAP Dot otherwise you will pay the full price (HEAD GASKET) when topping up add the amount requiered into your system. A merry exam to you, and all, also to all that read this post.