2004 Dodge Dakota Orifice Tube Location?

[kingtut1980]

I have a 2004 Dakota extended cab with a 3.7 liter engine. Recently I have noticed during hot weather that the AC is not keeping up, it cools but not well enough to keep you comfortable. I stuck my gauges on and the high side pressure is around 275 psi at an idle while the low side hangs around 45psi. It cools okay when it's not super hot, so I figured I might change the orifice tube and dryer and evacuate and recharge the system, problem is I don't know where the orifice tube is hidden. Any help would be appreciated..