In the case of an air-cooled engine, the engine compartment is hermetically sealed so that only cooling air can be sucked in through the grilles provided. Sucking in hot air is an attack on the cooling capacity.
The heating hoses that run through the engine shroud to the heat exchangers are therefore fitted with rubber seals. Just like the hose that draws in hot air from the bottom of the engine for carburettor preheating in newer Type 1 engines.
Volkswagen adapted rubbers for Type 1 engines in the early 1970s. Until 7.1970 the clamp disappeared in the rubber and from 8.1970 the clamp became visible. This modification was applied to ensure that the rubber could be pressed flatter onto the sheet metal, resulting in a better seal.
For type 1 engines, two parts are needed for the heating hoses and one part for the carburettor preheating. With type 4 engines you need two parts, the left and the right are different.
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