Engine temp. is normal but when rad. cap is open smoke comes out as if it were overheated. So much pressure that it put a hole in the heater hose and a small crack at the bottom of the reservoir. Some friends say common problem is head gasket. If its the Head Gasket shouldn't my oil have coolant and milky white? Never ran into a problem like this before, need all the help I can get, pls. Only car to get to and from work, thanks.
You may only see obvious coolant in your oil pan after considerable water has made its way into combustion chambers. For a small crack in the head, or a tiny leak in a head gasket, excessive pressurization of the cooling system by exhaust gas is a far more common first symptom. You can test this with an inexpensive radiator cap pressure guage: http://www.sears.com/shc/s/p_10153_12605_00946342000P?vName=Automotive&cName=Tools&Equipment&sName=Automotive%20Specialty%20Tools&psid=FROOGLE01&sid=IDx20070921x00003a
The normal expansion of coolant with temperature will naturally pressurize a cooling system to a few pounds per square inch range. But exhaust gas leaking into the cooling system will quickly drive that pressure 2 or 3 times higher, often blowing out the coolant past the pressure relief of the radiator cap, and perhaps damaging other parts like hoses and coolant reservoir.
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