excess heat in the interior of car on 2003 Mercedes-Benz C240 4MATIC

I am wondering why the interior of my car gets so hot! I know its from the engine, but is this normal? My A/C conked out as well, so could that be part of the problem?

Asked by for the 2003 Mercedes-Benz C240 4MATIC
Yes, Mercedes are airtight, so you can expect excessive heat with no ac there. where you live, provided theres no other problem, or MIL on dash.