The doghouse cooling fan is wider and blows around 25cf/sec 4000rpm, which is why cars with this cooling set-up NEED a slotted engine lid - the slots under the rear window are simply not large enough to provide the doghouse fan running with enough air at higher engine speeds.Īgain, don't lose sight of the fact that your Bug is AIRCOOLED. Note: Air flow for the non-doghouse 1300/1500/1600cc engines is 21 cubic feet per second at 4000 rpm.
#VW DOGHOUSE FAN SHROUD MANUAL#
*How to Keep Your Volkswagen Alive - A Manual of Step-by-Step Procedures for the Compleat Idiot, 1976 Edition, page 14. The fan housing for such models is referred to as a doghouse housing. In later models the oil cooler is located just forward of the main body of the fan housing, with separate housing tin molded around it. From there the air is blown primarily down through the cylinders and heads, but also (in cold weather) through nozzles on the sides of the fan shroud, through the heater boxes and to the front of the car to provide warmth in the winter.Īlso in the fan housing, bolted to the top of the crankcase with appropriate seals, is an oil cooler which stands up in the stream of air like a radiator and cools the oil which is pumped through it. The cooling air is drawn from the outside through slots in the car's body under the rear window (and, in later models, through slots in the engine lid as well) by the suction of the fan in the front (front) of the fan shroud. The fan is encased in a fan housing (often referred to as the fan shroud) which is attached to the engine tin to make an air-tight assembly.
#VW DOGHOUSE FAN SHROUD GENERATOR#
The fan is attached to the front (front is front of car) of the generator or alternator and is driven (along with the generator or alternator) by a belt from the crankshaft pulley. The entire engine is shrouded by sheet metal (usually called the engine tin) to direct the flowing air to the most efficient path. A centrifugal blower (usually referred to as a fan) is provided to force air down through the spaces between the fins to carry the heat to the atmosphere. The cylinders and heads are cast with fins to aid in the removal of heat. The Volkswagen engine is air-cooled, which means that the heat of combustion in the cylinders and heads is carried away by the flow of air. General Description of the Fan and Related.
The following topics related to the VW fan are discussed in this article.
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