CHRYSLER SERVICE MANUAL
COOLING SYSTEM—7
(and other magnet) away from
(C)
cold posi-
tion.
b.
Sending Unit
The sending unit
is
located
in the
water outlet
manifold
and
transmits
the
water temperature
to dash unit.
c. Electrical Circuit (Testing)
Remove wire
at
sending unit
and
turn ignition
switch
on.
Gauge hand should
not
move.
If
hand moves,
the
wire
is
grounded
or
gauge
is
defective. Remove wire
at
dash gauge terminal
"GA,"
and if
hand still moves, replace dash
gauge; otherwise, replace wire.
If
gauge
op-
erates correctly
and
wire
is not
grounded,
re-
place
the
engine unit.
6. THERMOSTAT (Testing)
(Fig. 9)
The thermostat starts
to
open
at
158-162
de-
grees
F.
(177-182 degrees
F. for Air
Condi-
tioned)
and is
fully opened
at 185° Std.
(202°
for
Air
Conditioned). Place thermostat
in a
pail
of
water with
a
thermometer
and
heat
wa-
ter until thermostat starts
to
open. Check
thermometer
and
continue heating until ther-
mostat
is
wide open,
and
again check thermom-
eter. Replace thermostats that do
not
open com-
pletely, open
at too low
temperature
or
open
at
too high temperature.
7. RADIATOR PRESSURE
CAP
Radiators
are
equipped with
a 14 psi cap, as
shown
in
Figure
10.
Always check identifica-
tion number
on cap,
when replacing.
WARNING
When removing pressure
cap,
turn
it
counter-
clockwise
to the
stop, permitting built
up
pres-
sure
to
escape through overflow tube. This will
prevent
hot
water from spraying
out of
radiator
filler opening.
SERVICE DIAGNOSIS
8. POOR CIRCULATION
a. Check
for low
coolant level
and
refill
to
114 inches below filler neck.
b.
Inspect
and
replace hoses
if
collapsed.
c. Check
for
plugged radiator
or
cylinder
block
and
reverse flush
as
necessary.
d. Check
for
loose water pump impeller
and
repair
as
necessary.
e. Check
for
loose
or
defective
fan
belt,
tighten
or
replace
as
necessary.
9. OVERHEATING
a. Refer
to
Poor Circulation listed
in
Para-
graph
8.
b.
Check
for
plugged
air
passages
of
radia-
tor core
and
clean passages
by
applying
air
pressure
on
reverse side
of
radiator core.
c. Check
for
sticking thermostat
and
replace
as necessary.
d. Check
for
excessive sludge
in the
crank-
case. Drain
and
flush crankcase
as
necessary.
In severe cases, remove
oil pan and
clean
in-
side
of
block
by
hand.
10.
OVERCOOLING
a. Check temperature gauges
and
replace
as
necessary.
b.
Check operation
of
thermostat (could
be
sticking)
in the
open position.
MyMopar.com
To Next Page
Loading...
