My Beetle Restoration

Disassembling the Heater Mufflers

by on Feb.14, 2011, under Disassembly

Disassembling the Heater Mufflers

I disassembled the heater mufflers today. These are used to muffle the engine noise so that it doesn’t come through the heater channels. This year (1960) is the last year that these were used. On the outside, is a vinyl cover that is wrapped over the entire muffler and the incoming tubes. Under the vinyl cover, is a 1/4” to 3/8” layer of cotton batting. Under the batting, is the muffler housing. The housing is a two-piece unit that is held together by two tabs on each side that are bent down to retain the top part to the bottom. The top piece comes off, but the bottom piece is welded to the tube coming through the rear cross member on one side and to the heater channel on the other side. Inside the muffler housing is a cartridge that consists of a cylinder of galvanized steel mesh that is wrapped with approximately 3/4” of tightly packed cotton batting which is then covered in a single layer of burlap. As the sound bounces through the pipe towards the heater channel, it is absorbed by the cotton.



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