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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 email@example.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.