Where is expansion valve located - 1998 Nissan Sentra

Newer units don't use an expansion valve, but instead just an orifice tube, usually located in the junction of the high side hose to the evaporator under the hood.

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

The expansion valve is always located at the evaporator core inlet and outlet pipe.

Here's a video from Scotty showing you how to replace your expansion valve,had mine replace not long ago,had Midas do mine. Replacing An Expansion Valve In Your Car ,hERE'S A NEW PART. Expansion Valve at AutoZone com Best Expansion Valve Parts for Cars Trucks...

the expansion valve is in the evaporator case. you can tell easily if your car has a bad expansion valve. connect the gauges and turn on air . observe the low side gauge it will pull down to a vacuum. the green numbers below zero.

Yours has a

thermal expansion valve (TXV). no orifice tube . look at fire wall where the a/c pipes go in look for this part .



The thermal expansion valve is located in the liquid line between the condenser and the evaporator. The thermal expansion valve is the dividing point for the high and the low pressure sides of the A/C system. As the refrigerant passes through the thermal expansion valve, the pressure of the refrigerant is lowered. Due to the pressure differential of the liquid refrigerant, the refrigerant will begin to vaporize at the thermal expansion valve. The thermal expansion valve also meters the amount of liquid refrigerant that can flow into the evaporator.

Hi Chester, I'm glad to help! The rear Expansion Valve is behind the right rear quarter panel. It mount in between the floor tubing and the evaporator tubs. Hope this helps and have an awesome day Chester.

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.

The expansion valve is located on the AC piping which is in the evaporator box , under the dashboard. The entire evaporator box must be removed to gaiun access to the expansion valve. This is not an 'easy' job.

raven 1g: Your car doesn't use an expansion valve. It uses a fixed orifice tube which is located in the smaller of the two A/C lines, just before they enter the cabin area of the car.
Just disconnect the line and pull the orifice tube out of the line. Be careful not to break off anything and leave it in the line.