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on 18/11/2002 4:06 PM, Jim Adney at jadney@vwtype3.org wrote: > One thing that most people don't realize is that the thermostatic valve inside > the mixer box just opens the flap once the temp reaches its set point. It > does not know whether there is actually a cool air tube connected there or > not. So if you leave the cool air tubes off, the thermostatic valve will open > and > just let the hot air spill outside and be wasted. This also means that the > temp inside the mixer box will not get moderated, so sometimes this > overheats and pops the thermostat. Does the cool air come from those intermediate heat exchangers on stock exhausts, or is there another piece that goes in between the air outlets on the fan housing? Has anyone got close-up pictures of the stock setup and the intermediate heat exchangers? I am thinking of making something up for my Fastback which has a non-stock exhaust on it, and at the moment it has those flimsy tinfoil hoses there, which don't usually last long. Thanks, Ben Doughney '75 1200L '63 1200 - Ringo '71 1600TL http://members.tripod.com/~superkafer/ ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/