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I hope this helps I know that a Photo Technical Manual is best but getting pictures inside the dash was a pain so I quit while I was doing the job, they were not coming out.
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This is the easiest. I broke the tabs off the element with needle nose pliers. **SAVE THE LOCK WASHERS AND RUBBER WASHERS**. Disconnect the rod by squeezing the 2 halves of the lock mechanism and the rod should come off the shaft.
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You approach the fresh air element via the glove box and the blower motor opening. You may have to disconnect some electrical wires on the amplifiers just above the glove box so you can get your hands on the element. I used a 90 degree pliers to push on the locking tab and then rotated the element out of its holder. I also removed the 90 degree tube from the blower to the side panel to egress the element. The attachment rod is disconnected by moving it perpendicular to the rod shaft and installed in reverse, very easy.
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Just replaced all the AC vacuum elements on my son’s 85 300D. I did not take pictures since it would have been very difficult to get good pictures. But I will put to paper (actually keyboard ) my thoughts since I just finished the job.