I am about to do a A/C retrofit on a 93 Camry 4cyl. Apparently though I have a clog in the low side so I suspect an orifice tube clog or an expansion valve problem. I haven't had this car very long and I am not very familiar yet with the mechanical layout of many of the components. The evaporator appears to be under the dash in the center of the car. The intake manifold to firewall has slim to none clearance. But I a need to know where the the orifice tube is located on this car and how do I gain access to the expansion valve on this car. Anyone have any experience with these components on this model?