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I think I'd worry more about old, leaky hatch seals and leaky header joints before I'd worry about the heater boxes. What's the particular concern, are you getting an exhaust smell back in the cabin? I got some spares off a guy who was a bug parts dealer and was dismantling a junk TIII engine. He commented on how heavy the TIII boxes were in comparison to the bug's. Those J-tubes are pretty heavy in through the box itself, plus being encased in the aluminum heat exchanger fins. I suppose you could have a rust-through up in the head, but that's heavier material than the tubing. If you're really convinced you have a leak, I suppose you could pull the box, plug one end and put some air pressure on the J-tube and see if you have air coming out the heater air inlet and outlet. I've never had a problem except with the tin heater box cover rusting through and that's outside. Air pressure from the fan would keep exhaust gas out of those holes. Other areas would be the fan to the body boot having a hole in combination with an exhaust leak or poor airflow. On Wed, 16 Sep 1998 21:09:40 -0500, you wrote: >Hello, > >I'm wondering how to evaluate the 'leakiness' of my environmental >control system. I think someone mentioned using a home carbon monoxide >detector. Any other quick ways short of taking apart the heater boxes? > >thanks > >Kevin >68 fastback savannah beige > >------------------------------------------------------------------- >Search old messages on the Web! Visit http://www.vwtype3.org/list/