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Thanks. The firewall on an R Class is about a foot in beyond the hood hinge. I'm hoping there's an easier way to get to it than this on the R Class. I'll do some looking tonight.
Looked at my W166 tonight. If I were to do this on my car, I would remove the cowl cover (no fasteners, it slips and clips in), small air duct or cowl drain (no fasteners), left (driver's side) and center bulkhead panels. The bulkhead panels seem relatively easily removed with a small number of accessible fasteners on the W166. On my vehicle the refrigerant tubes (pictured) penetrate the dash panel near the inboard edge of the steering wheel. I am not 100% certain the TXV can be removed after disconnecting the refrigerant tubes. This idea follows what is shown on the ML320 video above.
It seems the W164/X164 platforms may share parts or portions of the architecture. Look at mercedesbenzstarparts at the X164 TXV and it can be imagined that is it similar to the R-Class. The parts diagram requires some guesswork.
So, the search continues. I actually am having the fender (and Xenon Headlight assembly) replaced on the R Class (someone backed a trailer into it.)
I had the guy snap a couple of pictures. You can see the tire in the left lower corner.
This confirms my theory that the valve isn't in the engine bay/firewall. You can see the lines came through the inner fender wall and down, then insulated and head under the floor, just beneath the steering column.
Hi, I was wondering if you found the tx valve as I need to replace mine and im not sure where it is. Any help would be appreciated.
well, my valve stopped sticking, actually, so I never pursued it. However, the lines in the photograph go to the rear AC unit, so I suspect it is located behind the battery on the passenger side of the vehicle.
I f you find it let me know. I have one in a box as I suspect it might give me problems again I think the spring.
Discharge air conditioning system
Remove partition wall between wheelhouse liners (visible in the photos posted in this thread)
Remove engine trim panel
Remove air filter
Remove (additional?) partition wall/bulkhead
Relieve pressure on cooling system
Remove nut and bracket from high and low pressure refrigerant pipes, remove pipes
Remove bolts and remove expansion valve part A1648300084
Per EPC the same expansion valve part number is used for the rear A/C system.
well, my valve stopped sticking, actually, so I never pursued it. However, the lines in the photograph go to the rear AC unit, so I suspect it is located behind the battery on the passenger side of the vehicle.
I f you find it let me know. I have one in a box as I suspect it might give me problems again I think the spring.
So, I found the tx valve on my R300. I thought it was going to be a nightmare. But after removing the front and rear engine covers it only took 2 10mm bolts to find it. It’s behind the rear engine trim as shown in the pics.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
