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On that truck you do not have an orifice tube but what you do have is called an expansion block or also known as an H-valve and there are two if you have a dual a/c system..........
That sounds like the expansion valve.
The accumulator is a component on the low pressure (vacuum) side of an air conditioning system which uses a fixed orifice tube - they won't be found on a Thermal Expansion Valve system.
I just spent $ 785 to repair AC on 2005 PT Convertable with Turbo...it is an orifice system. Reason for AC failure was failed motor mounts and the engine torque pulled on the AC hoses until they failed and leaked suddenly.
There is no expansion valve. There is an orifice tue. It is located in the inlet tube of the evaporator core.
By law, this operation must be performed by an ASE certified tech in an EPA certified shop, which will have the necessary equipment to recover, store, and recycle refrigerant, and prevent it from being released into the atmosphere. Additionally, as this operation will open up the air conditioning system, the receiver-drier (if it's a Thermal Expansion Valve system) or accumulator (if it's a Fixed Orifice Tube system) will also need to be replaced.
Some units use orifice tubes and some units use thermostatic expansion valves to meter the refrigerant, but in either case it will be found between the condensation coil and the evaporator coil. Usually just before entering the evaporator coil.
A '99 Olds Delta 88 doesn't use an orifice tube system for the air conditioning it uses a thermal expansion valve. The location is under the passenger side dash in the heater/evaporator box. Unfortunately, you have to remove the dash to replace it as well as discharge the a/c system.
The ac system on a Ram doesn't use an expansion valve. It uses a fixed orifice system.
You need to have a system performance test performed on the vehicle. If it turns out to be a leak, and the system needs to be opened up in order for parts to be replaced, you'll also have to replace either the receiver-drier or the accumulator (which one you'll have depends on whether or not you have a fixed orifice tube system or a thermal expansion valve system).
A 2002 Ram truck does not have an expansion valve. The ac system uses an orifice tube that is made into the liquid line.
Could be a number of things. Plugged orifice tube/expansion valve. Condensor, evaporator plugged.