Pressure in the air conditioning/heating system, are you talking about refrigerant pressure, or cooling system pressure? By 'super high' what do you mean? If it is cooling system pressure, the cap should let off at 15-16 psi. If you checked for a cracked block, was the method used able to rule out blown head gasket? If it was a block test for hydrocarbons in the cooling system, if the leak is not in a combustion chamber(or near), you may not have a positive result. Are you confident that it is engine oil, and not transmission oil, or does it have an engine oil cooler integral to the radiator? You only have a few possibilities in this case, either oil was put in the cooling system physically, it is transmission oil from a leaking cooler in the radiator, it is engine oil from a leaking oil cooler in the radiator(if equipped), or it is a mechanical engine condition where pressurized oil is passing into the cooling system.
Friday, July 1st, 2011 AT 4:57 AM