Jeep Cherokee 1999 Electronic Service Manual page 1241

14 - 50 FUEL SYSTEM
REM OVAL AN D I N STALLAT I ON (Cont inue d)
ENGINE COOLANT TEMPERA TURE SENSOR
WARNING: HOT, PRESSURIZED COOLANT CAN
CAUSE INJURY BY SCALDING. COOLING SYSTEM
MUST BE PARTIALLY DRAINED BEFORE REMOV-
ING THE COOLANT
REFER TO GROUP 7, COOLING.
Th e coola n t t em per a t u r e sen sor is in st a lled in t h e
t h er m ost a t h ou sin g (F ig. 57).
Fig. 57 Engine Coolant Temperature Sensor—
REMOVAL
(1) P a r t ia lly dr a in coolin g syst em u n t il coola n t
level is below cylin der h ea d. Obser ve t h e WARN -
IN GS in Gr ou p 7, Coolin g.
(2) Discon n ect coola n t t em per a t u r e sen sor wir e
con n ect or.
(3) Rem ove sen sor fr om t h er m ost a t h ou sin g.
INSTALLA TION
(1) Apply sea la n t t o sen sor t h r ea ds (n ew r epla ce-
m en t sen sor s will h a ve sea la n t a lr ea dy a pplied).
(2) In st a ll coola n t t em per a t u r e sen sor in t o t h er m o-
st a t h ou sin g. Tigh t en t o 11 N·m (8 ft . lbs.) t or qu e.
(3) Con n ect wir e con n ect or.
(4) F ill coolin g syst em . Refer t o Gr ou p 7, Coolin g
Syst em .
INTAKE MANIFOLD AIR TEMPERA TURE
SENSOR
Th e in t a ke m a n ifold a ir t em per a t u r e (IAT) sen sor
is in st a lled in t o in t a ke m a n ifold plen u m n ea r t h r ot t le
body (F ig. 58) or (F ig. 59).
TEMPERATURE SENSOR.
Typical
Fig. 58 IAT Sensor Location—4.0L Engine
Fig. 59 IAT Sensor Location—2.5L Engine
REMOVAL
(1) Discon n ect elect r ica l con n ect or fr om IAT sen -
sor.
(2) Rem ove sen sor fr om in t a ke m a n ifold.
INSTALLA TION
(1) In st a ll IAT sen sor
Tigh t en sen sor t o 28 N·m (20 ft . lbs.) t or qu e.
(2) Con n ect elect r ica l con n ect or t o sen sor.
VEHICLE SPEED SENSOR
Th e veh icle speed sen sor is loca t ed on t h e speed-
om et er pin ion gea r a da pt er (F ig. 60) or (F ig. 61). Th e
pin ion gea r a da pt er is loca t ed on t h e ext en sion h ou s-
in g of t r a n sm ission (dr iver s side).
X J
in t o in t a ke m a n ifold.