[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [New Search]

Re: [T3] Heating in a Type 3



Charlie=> please outline the basics of the Type 3 heating system

The basics: 

Air enters the car through louvers in the rear, drawn in by the engine 
fan. Most of it goes to cool the engine, but two diversions from the 
(aluminum) fan shroud carry air down through two tin elbows into the 
rear heat exchangers, where it is warmed by waste heat from the exhaust 
manifolds of the rear cylinders. It moves from there into the larger 
pair of heat exchangers for the front cylinders. One of your heat levers 
controls the flaps in the front of these exchangers. The right exchanger 
has a hose going to the engine air intake for carb heat. Flaps open, hot 
air moves through the large flex hoses to the body. Just before it 
enters the body, it passes through a large valve on each side with a 
built-in thermostat. This meters in cool air from a smaller hose, coming 
off the fan elbow, to help prevent tennie-burn. 

Inside the body, the warm air passes through a pair of mufflers under 
the rear seat, and divides into rear and front heat. If you have a Ghia 
(T34), the left side will also divide to an outlet under the rear 
window (Fastbacks too?). The other heat lever controls flaps in the rear 
underseat outlets for front-to-rear mix. Front heat moves through the 
heater channels behind your rocker panels, famed for intense rust 
repair, and divides again into footwell and dash heat. The little 
grilles by your feet should have sliding doors on them, under the 
carpet. 

Under the dash, paper hoses carry hot air to the windshield. In the 
early models, heat and defrost are the same thing. I imagine things get 
a little more complex in later models, but you wanted the basics.

Hope this helps!

Steven Ayres, Prescott AZ
'66 343

-------------------------------------------------------------------
Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [New Search]