My 2008 grand Cherokee is overheating?

What is your question?

The engine is overheating but when I turn on the heater to full blast it begins too cool down. It's my wifes primary vehicle and i haven't physically inspected it yet due to being at work. I plan on checking the coolant but if it cools down with the heater on wouldn't that be a fan issue?

What makes this problem better or worse?

blasting heater cools car down

How long has your 2008 Jeep Grand Cherokee had this problem?

a week or so