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LIG HTS/ M ET ER/SWITC H ES
THERMOSTATIC SWITCH
I N S P E CT I O N
T h e the rmostati c switch senses t h e temperature o f t h e r a d i a
tor coolant a n d s i g n a l s t h e f a n moto r . The motor c o m e s i nto
action at 9 8 ° - 1 0 2 ° C ( 2 08 ° - 2 1 6 ° F ) a n d stops at b e l o w
9 3 ° - 9 7 ° C ( 1 9 9 ° - 2Q1 ° F ) .
Before testing c h e c k the c o o l a n t level at warm-up the e n g i n e
to operating temperature .
If the fan does not t u r n , d i s c o n n ect the connectors from t h e
thermostatic s w itch a n d j u m p the term i n a l s using a j u m p e r
w i r e . T u r n t h e i g n it i o n s w itch O N .
I f the fan turns, replace t h e thermostatic switc h .
If t h e f a n does n o t start test t h e f a n moto r : D i sconn ect t h e f a n
motor connecto r . ( 2 P B l a c k ) at t h e l eft steering h e a d c o n n e c
tor h o l d e r .
Check for battery b o l t a g e b e t w e e n the b l ue/black w i re a n d
g r o u n d with the i g n it i o n s w itch O N .
I f there i s n o voltage, c h e c k the su b-fuse ( 1 0 A ) . o r loose ter
m i n a l s or connector, o r an o p e n c i r c u it
Suspend the therm ostati c switch i n a p a n of coolant ( 50 - 50
m i xture) a n d c h e c k the tempe ratures at w h i c h the s w itch
opens a n d closes .
M a ke s u re that there is no conti n u ity at room temperat u re a n d
t h e n g r a d u a l l y r a i s e the c o o l a nt temperature . The switch
s h o u l d show c o n t i n u ity
207 ° F ) .
N OTE
o
Keep the temperature for 3 m i n utes to confirm cont i n u it y .
A s u d d e n c h a n g e of t e m p e rature w i l l c a u se error tempera
ture reading between the thermometer a n d switc h .
o
Do not let the s w itch or thermo meter touch the pan as it w i l l
g i ve a false read i n g .
o
I m merse the s w itch i n c o o l a n t u p to its thread s .
I nsta l l a n e w 0 - r i n g on t h e switc h .
A p p l y sea l a nt t o t h e switch thread a n d i n sta l l i t .
T i g hten the s w i t c h to the s p e c i f i e d torq u e .
1 8
( 1 .8
TORQUE:
N • m
kg-m,
NOTE
o
Do not over tig hten t h e sw itch .
COOLANT TEM P E RATU RE I N DICATOR
SYSTEM I N S P E C T I O N
R e m ove the horn .
Disconnect the sensor w i re from the thermosensor a n d s h o rt it
to ground using a j u m pe r w i r e .
T u r n t h e ignition s w i t c h O N .
T h e temperature i n d icator l i g h t s h o u l d come o n . I f the i n d i c a
tor l i ght d o e s n o t c o m e o n , c h e c k the su b-fuse ( 1 0 A ) a n d
w i res f o r a loose c o n n ection o r a n o p e n c i rcuit; if n o rm a l , re
p l a c e the meter with a new one .
1 8-8
( c l o s e )
at 9 3 ° - 9 7 ° C
( 1 9 9 ° -
1 3
ft-l b )
[]]
0
( 2 ) T H E R M OSTAT I C
S W I T C H
( 1 )
T H E R M O M ET E R
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Troubleshooting
