Jeep Cherokee 1999, Electronic Service Manual

Page: 1876 / 1948

u sed t o r ecover t h e r efr iger a n t fr om a n R-134a r efr ig-
er a n t syst em . Refer t o t h e oper a t in g in st r u ct ion s su p-
plied by t h e equ ipm en t m a n u fa ct u r er for t h e pr oper
ca r e a n d u se of t h is equ ipm en t .
REFRIGERANT SYSTEM EVACUATE
WARNING: REVIEW THE WARNINGS AND CAU-
TIONS IN THE GENERAL INFORMATION SECTION
NEAR THE FRONT OF THIS GROUP BEFORE EVAC-
UATING THE SYSTEM.
If t h e r efr iger a n t syst em h a s been open t o t h e
a t m osph er e, it m u st be eva cu a t ed befor e t h e syst em
ca n be ch a r ged. If m oist u r e a n d a ir en t er s t h e syst em
a n d becom es m ixed wit h t h e r efr iger a n t , t h e com -
pr essor h ea d pr essu r e will r ise a bove a ccept a ble
oper a t in g levels. Th is will r edu ce t h e per for m a n ce of
t h e a ir con dit ion er a n d da m a ge t h e com pr essor.
E va cu a t in g t h e r efr iger a n t syst em will r em ove t h e
a ir a n d boil t h e m oist u r e ou t of t h e syst em a t n ea r
r oom t em per a t u r e. To eva cu a t e t h e r efr iger a n t sys-
t em , u se t h e followin g pr ocedu r e:
(1) Con n ect a R-134a r efr iger a n t r ecover y/r ecy-
clin g/ch a r gin g st a t ion t h a t m eet s SAE St a n da r d
J 2210 a n d a m a n ifold ga u ge set t o t h e r efr iger a n t
syst em of t h e veh icle.
(2) Open t h e low a n d h igh side va lves a n d st a r t
t h e ch a r gin g st a t ion va cu u m pu m p. Wh en t h e su c-
t ion ga u ge r ea ds 88 kP a (26 in . H g.) va cu u m or
gr ea t er, close a ll of t h e va lves a n d t u r n off t h e va c-
u u m pu m p.
(a ) If t h e r efr iger a n t syst em fa ils t o r ea ch t h e
specified va cu u m , t h e syst em h a s a lea k t h a t m u st
be cor r ect ed. See Refr iger a n t Syst em Lea ks in t h e
Dia gn osis a n d Test in g sect ion of t h is gr ou p for t h e
pr ocedu r es.
(b) If t h e r efr iger a n t syst em m a in t a in s t h e spec-
ified va cu u m for five m in u t es, r est a r t t h e va cu u m
pu m p, open t h e su ct ion a n d disch a r ge va lves a n d
eva cu a t e t h e syst em for a n a ddit ion a l t en m in u t es.
(3) Close a ll of t h e va lves, a n d t u r n off t h e ch a r g-
in g st a t ion va cu u m pu m p.
(4) Th e r efr iger a n t syst em is n ow r ea dy t o be
ch a r ged wit h R-134a r efr iger a n t . See Refr iger a n t
Syst em Ch a r ge in t h e Ser vice P r ocedu r es sect ion of
t h is gr ou p.
REFRIGERANT SYSTEM CHARGE
WARNING: REVIEW THE WARNINGS AND CAU-
TIONS IN THE FRONT OF THIS GROUP BEFORE
CHARGING THE REFRIGERANT SYSTEM.
Aft er t h e r efr iger a n t syst em h a s been t est ed for
lea ks a n d eva cu a t ed, a r efr iger a n t ch a r ge ca n be
in ject ed in t o t h e syst em . See Refr iger a n t Ch a r ge
Ca pa cit y for t h e pr oper a m ou n t of t h e r efr iger a n t
ch a r ge.
A R-134a r efr iger a n t r ecover y/r ecyclin g/ch a r gin g
st a t ion t h a t m eet s SAE St a n da r d J 2210 m u st be
u sed t o ch a r ge t h e r efr iger a n t syst em wit h R-134a
r efr iger a n t . Refer t o t h e oper a t in g in st r u ct ion s su p-
plied by t h e equ ipm en t m a n u fa ct u r er for pr oper ca r e
a n d u se of t h is equ ipm en t .
REFRIGERANT CHARGE CAPACITY
Th e R-134a r efr iger a n t syst em ch a r ge ca pa cit y for
t h is veh icle is 0.567 kilogr a m s (1.25 pou n ds).
REFRIGERANT OIL LEVEL
Wh en a n a ir con dit ion in g syst em is a ssem bled a t
t h e fa ct or y, a ll com pon en t s except t h e com pr essor a r e
r efr iger a n t oil fr ee. Aft er t h e r efr iger a n t syst em h a s
been ch a r ged a n d oper a t ed, t h e r efr iger a n t oil in t h e
com pr essor is disper sed t h r ou gh ou t t h e r efr iger a n t
syst em . Th e a ccu m u la t or, eva por a t or, con den ser, a n d
com pr essor will ea ch r et a in a sign ifica n t a m ou n t of
t h e n eeded r efr iger a n t oil.
It is im por t a n t t o h a ve t h e cor r ect a m ou n t of oil in
t h e r efr iger a n t syst em . Th is en su r es pr oper lu br ica -
t ion of t h e com pr essor. Too lit t le oil will r esu lt in
da m a ge t o t h e com pr essor. Too m u ch oil will r edu ce
t h e coolin g ca pa cit y of t h e a ir con dit ion in g syst em .
It will n ot be n ecessa r y t o ch eck t h e oil level in t h e
com pr essor or t o a dd oil, u n less t h er e h a s been a n oil
loss. An oil loss m a y occu r du e t o a r u pt u r e or lea k
fr om a r efr iger a n t lin e, a con n ect or fit t in g, a com po-
n en t , or a com pon en t sea l. If a lea k occu r s, a dd 30
m illilit er s (1 flu id ou n ce) of r efr iger a n t oil t o t h e
r efr iger a n t syst em a ft er t h e r epa ir h a s been m a de.
Refr iger a n t oil loss will be eviden t a t t h e lea k poin t
by t h e pr esen ce of a wet , sh in y su r fa ce a r ou n d t h e
lea k.
Refr iger a n t oil m u st be a dded wh en a a ccu m u la t or,
eva por a t or coil, or con den ser a r e r epla ced. See t h e
Refr iger a n t Oil Ca pa cit ies ch a r t . Wh en a com pr essor
is r epla ced, t h e r efr iger a n t oil m u st be dr a in ed fr om
t h e old com pr essor a n d m ea su r ed. Dr a in a ll of t h e
r efr iger a n t oil fr om t h e n ew com pr essor, t h en fill t h e
n ew com pr essor wit h t h e sa m e a m ou n t of r efr iger a n t
oil t h a t wa s dr a in ed ou t of t h e old com pr essor.
Refrigerant Oil Capacities
Component ml fl oz
A/C System 240 8.1
Accumulator 120 4
Condenser 30 1
Evaporator 60 2
Compressor
drain and measure the oil from
the old compressor - see text.
X J HEATING AND AIR CONDITIONING 24 - 23
SERV I CE PROCEDU RES (Cont inue d)