Try bleeding any air out of your cooling system. This is a shot in the dark, but check the coolant temp sensor. It's directly under the thermostat.
Coolant is typically changed every 30,000 - 50,000 miles.
Have the coolant changed immediately and you will be ok.
The correct coolant is DEXCOOL it has an orange color to it. If your coolant is green the coolant has been changed. It has been found out that DEXCOOL was bad for Aluminum heads and gaskets. Best to switch to the green coolant.
It is not rust, but broken down extended life coolant. When Extended life coolant goes beyond the replacement time, every five years, it can break down and turn into a rusty sludge like substance. I would bet if you haven't changed the coolant in the car, it has never been changed.
THe fluid will need flushed and changed.
Blown head gasket is a distinct possibility, unless you just flushed and changed the coolant. In that case it is trapped air escaping.
Your check engine light will not come on because your coolant needs to be changed. The only way to be totally sure why it is on you should get it checked with a computer at a dealer or service station. The check engine light may come on if it is over heating because there is no coolant in it but not if it just has to be changed.
Where is it leaking from? Could be front or rear seal or coolant lines Did you change gasket when you changed fluid?
has the red coolant in a 2005 monte carlo been changed since reports on it deteriorating the head gasket?
If it's overheating, it cold be thermostat, radiator or possibly other problems. If it's not overheating it could be the coolant level sensor.
There are all sorts of places that coolant can be leaking from. You just have to look until you locate it.
you didnt but the pipes on right