So, I finally got behind the glovebox to look for this infamous foam tube for the dash sensor on my 83' 300D, that if suitably replaced will supposedly give me a system that does something other than "I want it hot!" or "I want it cold!".
Sure enough there was a hunk of gunky, sticky foam stuff between a couple lengths of seemingly regular rubber and/or plastic hose. It was suggested that a piece of belled hose such as that from the radiator reservoir makes a good replacement. I don't have a junk car to use and I haven't made it to the FLAPS to see if they have a nice cheap replacement so i was wondering what my other options might be. If the idea is simply to get some flow, but not full flow air through, how appropriately sized does the belled hose need to be? Could I just use one larger piece of hose over top of the smaller? I.e. the I.D. of one hose matches the O.D. of the other. Could I simpy get a regular piece of hose and put some holes in it? As for explanation of the system, is it basially just trying to get some low flow of air over the sensor by pulling from the blower motor? Is it also sampling outside air? I found a broken hose that seems to be heading out the side of the car right in front of the passenger door and the other end seems to come from near where the air temp sensor is. I think I've mostly got it sealed up now with some electrical tape. Thanks! Levi
