The slit in the end of the tube is to prevent fumes getting drawn up from
the engine compartment into the heater system and thence the cabin. It was
also fitted to 80s and 90s Metros, at least. Whether the bulb on the end is
to squeeze gunge out or not is a moot point on the MGB as it isn't that easy
to get to. And in any case you could open up the slit simply by pressing on
the sides of a plain tube, the bulb perversely makes it *less* likely to
eject gunge that way as it will hold a larger lump.
Look in the air intake, if you can see water lying there the drain is
blocked. If not then pour some water in and see if it runs out immediately.
If not then it is partially blocked. The drain is at the right-hand end,
and bit of 1/4" or so dowel poked in should locate the depression which is
the top of the tube. Photos here
http://www.mgb-stuff.org.uk/heatertext.htm#airb
Much easier to clear from above, unless getting a face and arm-full of
rotting vegetation and insect life floats your boat. Once you have the
dowel through pour clean water in from the top until it runs clean from the
bottom.
PaulH.
----- Original Message -----
> No that does not make sense ! The drain tube goes up to the intake so no
> exhaust fumes there. The bulb is probably there to allow a "squeeze".
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