Re: Speaking of Heat

[Greg Merritt <gregm@engin.umich.edu>]

The "j-tubes" inside of the heater boxes are quite thick.  Very often,
the source of exhaust fumes in the heater comes from the junction of the
heater box & the rest of the exhaust.  If the exhaust clamps don't seal
tightly, and if there is a leak in the heater box shrouding, the
high-pressure
exhaust forces its way into the heater.

	Those narrow pipes are controlled by thermostats... they let cool air
in if the heater gets too hot.  I've removed the two small thermostats
up
near the body, along with the small cooling tubes.  Need all the heat I
can get!  (Note, I'm not talking about the useful thermostat that
controls
the engine cooling flaps; the DPO removed those...:(  )

-Greg
'71 squareback
'63 Beetle

cwoolsto@ladc.lockheed.com wrote:
> 
> When I turn on the heat in my '71 Fastback it makes the car smell like exhaust.  I've checked the pipes from the heater boxes to
> the firewall (fine), the pipes from the fan to the heater boxes (fine) and the one small pipe from the heater boxes to the fire wall (I
> believe it is for defrost, also fine).  So the question is, are the insides of the hear boxes shot or does some else have a different
> idea?  Thanks in advance.