Chrysler RAM TRUCK 2500 1994 Service Manual page 269

7 - 14 COOLING SYSTEM
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COOLING SYSTEM DIAGNOSIS—DIESEL—CONTINUED
C O N D I T I O N A N D CHECKS
D I A G N O S I S
PRESSURE C A P WENTS TO ATMOSPHERE A N D
C O O L A N T R E S E R V E T A N K . T E M P E R A T U R E G A U G E
READING A B O V E N O R M A L B U T NOT H I G H s
(1) Test r a d i a t o r pressure c a p relief pressure. Refer t o
R a d i a t o r Pressure c a p section in this g r o u p .
(1) R e p l a c e c a p i f relief pressure is l o w e r t h a n 14 p s i .
C O O L A N T L O S S V I S I B L E O N G R O U N D B E L O W
V E H I C L E , B U T N O PRESSURE CAP BLOW OP ft
(1) Inspect system f o r leaks. (1) R e p a i r as necessary.
C O O L A N T L O S S P A S T P R E S S U R E C A P T O P S E A L ,
VISIBLE O N R A D I A T O R FILLER N E C K s
(1) W i t h n o r m a l g a u g e r e a d i n g .
(2) W i t h h i g h o r l o w g a u g e r e a d i n g o n n e w vehicle.
(1) a — Pressure c a p n o t i n s t a l l e d t i g h t l y ,
b — Pressure c a p t o p seal leaks.
c — Pressure c a p d i a p h r a g m b o w e d .
d — D a m a g e d r a d i a t o r filler n e c k .
e — Pressure c a p t o p s e a l o u t o f p o s i t i o n .
(2) a — K i n k e d c o o l a n t reserve/overflow system hose.
b — C o o l a n t reserve system t a n k plastic t u b e p l u g g e d ,
c — Pressure c a p seal o u t o f p o s i t i o n .
C O O L I N G S Y S T E M H O S E S C O L L A P S E
O N C O O L D O W N t
(1) Inspect pressure c a p vent v a l v e .
(2) C o o l a n t reserve t a n k hose p l u g g e d o r k i n k e d .
(3) Inside o f pressure c a p p l u g g e d .
(1) a — G a s k e t s w e l l c a n prevent v a l v e f r o m o p e n i n g ,
b — R e p l a c e pressure c a p .
(2) R e p a i r as necessary.
(3) C l e a n c a p o r r e p l a c e i f necessary.
C O O L I N G S Y S T E M S U S P E C T E D A S C A U S E O F
I N A D E Q U A T E AIR C O N D I T I O N I N G S Y S T E M
P E R F O R M A N C E !
(1)
Inspect for p l u g g e d r a d i a t o r a n d / o r condenser.
(2) Inspect f o r missing a i r seals in the r e c i r c u l a t i n g a i r p a t h .
(1) C l e a n w i t h l o w pressure w a t e r f r o m f a n side.
(2) R e p a i r as necessary.
E X C E S S I V E F A N NOISEs
(1) Inspect f o r l o o s e o r b e n t f a n b l a d e s .
(2) Inspect c l e a r a n c e b e t w e e n f a n a n d a d j a c e n t p a r t .
(3) Inspect r a d i a t o r a n d c o n d e n s e r f o r i n c o m i n g a i r
o b s t r u c t i o n s .
(4) Inspect t h e r m a l viscous fan d r i v e .
(1) R e p l a c e f a n .
(2) R e p a i r o r r e p l a c e as necessary.
(3) C l e a n a i r p a t h w i t h l o w pressure w a t e r f r o m f a n side.
(4) R e p l a c e i f viscous d r i v e d o e s n o t o p e r a t e p r o p e r l y .
H E A T O D O R i
(1) W a s t e m p e r a t u r e g a u g e r e a d i n g high?
(2) A r e a l l h e a t shields i n p l a c e ?
(1) If Y E S , refer t o G A U G E R E A D I N G H I G H . If N O , check
c o n d i t i o n o f a l l h e a t shields.
(2) If N O , r e p a i r as r e q u i r e d .
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