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THE
BODY
return pipe and
union
(
11) and
joint washer
(28)
to
the
threaded
hole in
the
water return casting. Secure the
pipe
by tightening the
union
firmly. Fit the
two
clips (18) to
the oil filter pipe and
fasten
them
to
the clips on the
copper return pipe using
two
screws
(21),
two washers
(26),
and
two nuts (24). Connect the heater outlet
to
the
copper return
pipe with the short rubber water
hose
(12)
and
secure at both ends with
two
clips (32).
Fit the
two demisi tubes (14) to the holes in
the
lower
heater
case
seen
under
the
fascia
above the
air
outlet
door
using six
screws
(20).
Fit the
14
in.
(35·6 em.)
air
hose
(6)
to the
lo;.ft·hand
demisi tube and the
25
in
.
(63·5
em
.)
air
hose (7)
to
the right-band demist tube.
Connect
both a ir
hoses
to
the
demist nozzles a lready
fitted under
the dash
panel with
the
two rubber
adaptors
(
19).
Connect the
switch
leads from the
temperature
control
lever
to
the green lead and
the
green lead with
brown
tracer
issuing
from
the
harness
below
the
fascia
(on
the
car
these
two
wires may be found already
j
oined to-
gether by a snap connector).
Connect
the
leads
from
the
heater
motor
to
the black
.lead
and
the
green
lead with
brown
tracer issuing
from the
harness behind the heater
(snap
connectors
on
all leads).
Reconnect
the battery
leads.
Refill the
cooling
system,
start the engine
and
check
for
water
leaks. Push the
'
AIR'
and
'
DEMlST'
knobs in,
pull the central control out and slide the temperature
control lever
to the
'MAX'.
position. If
the heater has
been
fitted
correctly a cool
stream of air
will
enter the
car
interior
through
the
air
outlet
door and will
be
heated
as the cooling system warms
up.
If the water return hose does not warm
up
in a few
minutes an air-lock may
be
present in the system.
If
this
happens switch off the
engine
and
remove
the rubber
hose
from
the copper return
pipe.
Extend the
rubber
hose
by
some temporary
means so that the water
will
flow
back
into the
radiator
through the filler
neck. Plug
the copper
pipe
temporarily.
Start
the
engine and allow it to run
at
a
fast idling
speed.
Note
the
water
flow-back into
the radiator. When
this is
smooth
and bubble-free
reconnect the
hose to the
copper pipe and tighten the
clip
as
quickly
as possible.
Fit
the longer
air
hose (9)
between the rear of the
air
hose
connector on the
left-hand side of the radiator
and
the
air
intake on the
heater.
Secure
at
both
ends using
the two flexible clips (31) and fasten the
hose to
the
bonnet drain channel with two
cleats (17)
together
with
two screws
(23),
two washers (27),
and two nuts
(25).
It
may be
necessary to
drill
two
it
in. (5·16 mm.)
diameter holes
in
the bonnet drain
channel
for
the
securing screws.
When
d
raining the
cooling
system
it is not possible
to
completely drain
the heater unit.
Anti-freeze
must,
therefore,
be used in
the
cooling system
when frost
is
anticipated .
•
Fig.
S.3
Components
of
the M.G.
(Series
MGA
Twin
Cam)
fresh air ventilation
kit
fitted
in
position
S.6
MGA
(IWUt
cam).
Issue
2.
23026
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