Your vehicle does not have an orfice. It has an expansion valve.
SOURCE: 2006 chevy hhr transmission fluid and filter change
usually a pan under the trans. anywhere from 10 to 22 bolts. filter inside. some vehicles have an oil style filter on the externally, but i don't think that this is one.
SOURCE: Key win't turn ignition switch in 2008 Chevy HHR
replace the floor shifter. there is a switch on the shifter that allows the key to move. gm has had alot of problems with these shifters.
SOURCE: 2007 Chevy HHR Fuse panel
There should be a printed list on the inside of the fuse boxes, as well as in the owners manual. There is one box under the hood, and another on the right side of the console near the passenger's feet.
SOURCE: 2008 HHR LS can't get to drivers side headlight bu...
This video will show you how to replace the headlight and also the bulb in the headlight of your HHR">
SOURCE: Where is the orifice tube
The orifice screen is located in the evaporator inlet tube. 
Hope this will Fix Ya up.
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