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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.
It is located in the engine cover, the large plastic cover that hides most of the engine. It's a pain to get to. You need to remove the air boot that goes to the throttle body and also remove the intake duct that attaches to the radiator core support. There are some philips head screws that hold the 2 halves of the engine cover over the filter, you have to access the underside of the engine cover to get to them.
How to change air filter 1. Unplug the Mass Air Flow (MAF) sensor. 2. Undo the spring clips and pull out the turbo inlet connector. 3. Remove the two T-25 screws on the air snorkle as shown below. 4. Remove the engine cover by pulling up HARD where indicated by the green circles in the photo below. 5. DO NOT APPLY ANY FORCE where indicated by the red diamonds in the photo below. 6. If it's cold weather, make sure the engine is warm so that the rubber grommets warm up and are flexible enough to come off. Cold, brittle plastic and stiff grommets will lead to a broken airbox/cover even if you otherwise do everything correctly. 7. Pull up on the rear driver's corner (near the battery box) first, then the rear corner where the MAF sensor is, then the fronts.
On the VW Jetta MkV, the cabin filter is underneath the glove box. Access is gained by removing two plastic screws, gently pulling down a piece of foam insulation, and releasing a single clip to detach the filter. It (and some debris from it) fall easily onto the floor mat below. Insert the new cabin filter, replace the insulation, re-screw the screws, and within 3 minutes, you're back in business with fresh air and clean hands besides!
Its located on the drivers side just behind the battery and in front of the strut tower, a black square box with a black round plastic tube going to it, remove the top cover and you will see the square air filter inside.