01 olds silhoutte orificetube location ive had all lines off between condensor and evap and havent found it does it have expansion valve under dash in ac box

Vehicle is equipped with an expansion valve. It looks like this located on the passenger side fire wall

the expansion valve (TX valve) is located at the inlet side pipe of the evaporator under the dash

I think these don't use a traditional expansion valve, but rather an "orifice tube", located in the high pressure line junction near firewall going to evap unit.

the A/C expansion valve (orfice) is right next to the evaporator
in fact that is what causes the Freon to change from liquid to gas.
and must be there.
the Canister, (the receiver /dryer ) is usually near the condensor. end .
you can see the line clear, open hood, see the 2 compressor lines
the 2 fire wall line(hoses/pipes)
see the 2 condensor lines.
the dryer is on the line to the condensor. just follow it, and bingo. thar she be....

The expansion valve will be on the line for the high side of the system and if you look real close the line will have a dimple in the line and that is where the valve is. If I was you I would start checking at the condenser and if not there check just before it goes into the evap. However, it will be in the high pressure line for sure.

Kia Sedona expansion FRONT valve located under dash, behind glove box, fan and coil. Evacuate freon first. Disconnect Freon lines from firewall., Lay right front seat back to flat horizontal position and lay on top or totally remove the seat for easier working access. Remove under dash cover, fan, glove box, coil housing, remove coil mounting bolts, remove old expansion valve. (Inspect old valve, if debris inside, blow out coil before installing new valve. If visible debris best to consider replacing REAR expansion valve and DRIER/FILTER in front of radiator too and blow out all lines and coils while servicing.) Use compressor oil to lubricate "O" rings on new FRONT or REAR expansion valve, install valve bolts, reinstall coil bolts to FRONT firewall or REAR frame, reconnect freon lines to firewall in engine compartment. Evacuate AC system, install freon (35 1/2 ounces, nominal 3 pounds), check system for leaks, check for proper operation, enjoy.

dodge trucks use a liquid line for the expansion device. this line is located on the right fender between the condensor and the evaporator.

its the funny looking metal valve that looks like it has a flat hat on it with copper tubeing, its on the presure line running to the accumullator on most systems but could be near coils on condensor or evap i hope this helps a little do a parts search at a parts store or get a diagram publis library has it for free they make you a copy thsi system is under pressure becarful thsi can get tricky to get right there are a lot of things that have to be done just right to fix a air conditioner good luck let me know if i can help hope i did ,and didnt confuse you be safe

Expansion valve is located passenger dash area , inside the evaporator housing. This is not a repair that can be easily done by a home "do it yourselfer".It requires evacuating the the air condition system of freon is the biggest obsticle doing at home. Rec. taking to a certified a/c repair shop for this repair.

the heater core lines are under the dash and when it starts leak i will flood the floor board. does the ac shut down even if you are running it on recirculate and on fresh air. it may be the compressor clutch. if that hasn't been replaced yet.