Toyota Celica 1993 AT200 series Repair Manual page 977

AC-22
AIR CONDITIOI{ING
SYSTEM _ TROUBLESHOOTING
4, POOR CIRCULATION OF REFRIGERATTT
5. REFRIGERANT DOES NOT CIRCULATE
Condition: Insuffici€ntcooling
SymPtom s€€n in
refrigerotion iyst€m
Probablo causo
D i a g n o s i g
Romody
Pressurs low on both
low End high pre6sur€
s t d 6 s
Frost on tubes from ro-
. Rofriggront flow ob-
slructod by dirt in 16-
coivet
R6c€iv€r clogg€d
. Roplac€ rec6iv6r
Condition: Does not cool (Cools lrom tim€ to time in some cases)
Symptom segn in
retriger6tion system
Prob8blo caus€
Oiagnosis
Rem€dy
Vacuum indicated on
low pressure side, v€ry
low pressure indicatad
on hjgh pressu.e sid6
Frost or dew seen on
piping b6fore and 6ttor
receiver/dri€r or expan-
sion valv€
Re{rigerant flow ob-
structed by moiature or
dirt in rotriger6tion sys-
rem
Refragerant flow ob-
strl.rct9d by ga8 leakage
lrom 6xpansion valv6
heat s€nsing tubo
Retrigeront do€s not cir'
c0late
(1 ) Check heat sensing
tub€, expansion valve
(2) Cle€n oul dirt in expan-
sion valve by blowing
w i t h g i r
lf not ablo to remove
din, replace expansion
(3) Replsce receiver
(4) Evacuste air and
charge new reffigeranl
to proper Smount.
For gas leakage from
he6t s€nsing tube, re-
place expansion valve.