Chevrolet LIGHT DUTY TRUCK (SERIES 10-35) Service Manual page 58

POOR SEAL A T M O DULE TO COVER OR
M O DU LE TO COWL
POOR SEA L A T E VA PO R A TO R CORE TO
E VA P O R A TO R CASE OR E VA PO R A TO R TO
H E A T E R CASE.
D E F E C T IV E OR M IS SING E V A P O R A TO R D R A IN
HOSE.
A IR DUCTS N O T P RO PERLY CO N N E C TE D .
V A C U U M C O N T R O L HOSES NO T C O N N E C TE D
PR O PE R LY .
O FF A L L T IM E
1
CHECK COMPRESSOR H O T LE A D W IRE
W ITH TE ST L IG H T OR PLACE
JUMPER W IRE FRO M TH E
COMPRESSOR TO P O S ITIV E (+)
T E R M IN A L OF B A T TE R Y
NO T E NG AG ED
APPLY E X T E R N A L G R O U N D
TO COMPRESSOR, IF C LU TCH
IS S T IL L NO T ENG A G ED
RE M O V E C LU TC H & REPAIR
AS PER S E R VIC E M A N U A L .
SYSTEM
(O.K.)
A L L SWITCHES
CHECK O.K.
CHECK FOR BRO KEN W IRE
OR LOOSE CO N N E C TIO N
IN COMPRESSOR C IR C U IT
R E P A IR OR REPLACE
SYSTEM
(O .K.)
| BELOW 22 PSIG (152 kPa) | ■
LOST CHARGE
LE A K TEST A N D
RE P AIR. E VA C U A TE
AN D RE-CHARG E
SYSTEM
Fig. 1 B -1 4 -C C O T T h e rm o s ta tic C y c lin g S y s te m D ia g n o s tic P ro c e d u re s
C .C .O .T. A /C S Y S T E M D IA G N O S T IC PR O C ED U R E
" IN S U F F IC IE N T C O O L IN G "
M O VE TEMP. LE V E R R A P ID L Y BACK A N D FO R TH FRO M
M A X . H E A T TO M A X . C O LD —LIS TEN FOR DOOR H IT T IN G A T EACH END.
1. SET TEMP. LE V E R F U L L CO LD.
2. SET SELECTO R L E V E R "N O R M " A /C .
3. SET BLOWER SW ITCH ON " H IG H ."
4. OPEN DOORS A N D HOOD.
5. W A RM E N G IN E (CHOKE OPEN & O FF FAST ID LE SPEED CAM ).
6. RU N E N G IN E A T ID L E .
FE EL FOR A IR FLOW A T H E A TE R A N D A /C O UTLETS
CHECK V IS U A L L Y FOR COMPRESSOR C LU TC H O P E R A TIO N —
CHECK FOR BLOWN M A IN FUSE
CHECK FOR OPEN C IR C U IT
A T T H E FO LLO W IN G
LOW CHA RG E
PRESS. SW ITCH
AFTER SETTIN G UP
M A N IF O L D GAGE SET,
CHECK R E FR IG ER A N T
PRESS. A T HIG H SIDE
F IT T IN G A T PRESS.
SWITCH
I
(O .K.)
• [ CHECK FOR: | -
I
A IR FLOW FRO M A /C
O U T L E T S O N L Y
1
INSPECT FUSE
BAD FUSE,
FUSE BLOWN
BUT N O T BLOWN
REPLACE FUSE LO CATE CAUSE
& CO RRECT
SYSTEM
REPLACE FUSE
(O .K.)
TH E R M O S TA TIC
D E F E C T IV E
SW ITCH
| ABOVE 22 PSIG (152 kPa) |
JUMP PRESS. SWITCH
COMPRESSOR RUNS
D E F E C T IV E SW ITCH
LEAK CHECK SYSTEM
A N D REPLACE SWITCH
E VA C U A TE & RE CHARG E
SYSTEM
(O.K.)
AIR CONDITIONING
r
NO BLOWER
[ O PE R A TIO N | - J
b l o w e r
_____ i L
BLOWER OK
NO T H IT T IN G
ADJUST TEM P. DOOR
L
SOME OR A L L A IR FLOW
FR O M H E A TE R O U T L E T
REPAIR AS PER SER VIC E M A N U A L
*
(SEE FIG . 1B-20B)
CHECK C.C.O.T. SYSTEM
W IR IN G D IA G R A M
SEE SER VIC E M A N U A L
FOR BLOWER M O TO R
SYSTEM
(O.K.)
SYSTEM
(O .K.)
SW ITCH
SYSTEM
(O .K.)
LIGHT T R U CK SER V IC E MANUAL
1B-15
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