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A damaged cylinder head gasket or a cracked engine block are two typical causes of coolant and oil mixing together. These typically happen after the engine has overheated. This is less likely than a cooling system leak.
If you are referring to left outside air vent when looking from the back of the car to the front, that is engine air intake vent. So it's not surprising that you wouldn't feel hot air being blown out of it. The right side is where the engine compartment vent hot air when the compartment temperature rises above a certain level.
Last edited by thom4782; 09-01-2013 at 05:38 PM.
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