Dodge Sprinter 2006 Manual page 2117

VA
INSTALLA TION
NOTE: Be certain to add refrigerant oil if the rear
A/C evaporator is being replaced. The refrigerant oil
must be drained from the old evaporator and mea-
sured to determine the amount of refrigerant oil to
add to the new evaporator. Use only refrigerant oil
of the type recommended for the rear A/C compres-
sor in the vehicle.
(1) If t h e r ea r A/C eva por a t or is bein g r epla ced,
in st a ll t h e cor r ect a m ou n t a n d t ype of r efr iger a n t oil
in t o t h e n ew r ea r A/C eva por a t or. Dr a in t h e old eva p-
or a t or a n d m ea su r e t h e r efr iger a n t oil. F ill t h e n ew
eva por a t or wit h t h e sa m e a m ou n t of n ew r efr iger a n t
oil t h a t wa s dr a in ed ou t of t h e old eva por a t or.
(2) P osit ion t h e r ea r A/C eva por a t or t o t h e bot t om
of t h e r ea r A/C eva por a t or h ou sin g a n d in st a ll fou r
n ew r ivet s.
(3) P osit ion t h e t h r ee cover s t o t h e r ea r A/C eva p-
or a t or a n d in st a ll eigh t n ew r ivet s.
(4) In st a ll t h e left blower m ot or on t o t h e r ea r A/C
eva por a t or h ou sin g (Refer t o 24 - H E ATING & AIR
CONDITIONING/DISTRIBUTION - RE AR/BLOWE R
MOTOR - INSTALLATION).
(5) Con n ect t h e r ea r A/C expa n sion va lve t o t h e
r ea r A/C eva por a t or a n d in st a ll n ew in su la t in g t a pe
(Refer t o 24 - H E ATING & AIR CONDITIONING/
P LUMBING/RE AR A/C
INSTALLATION).
(6) P osit ion t h e con den sa t e dr a in pa n t o t h e bot -
t om of t h e r ea r A/C eva por a t or a n d in st a ll t h e five
scr ews a n d wa sh er s t h a t secu r e t h e dr a in pa n t o t h e
eva por a t or. Tigh t en t h e scr ews t o 2.2 N·m (20 in .
lbs.).
(7) In st a ll t h e r ea r A/C eva por a t or h ou sin g (Refer
t o 24 - H E ATING & AIR CONDITIONING/DISTRI-
BUTION/RE AR A/C E VAP ORATOR H OUSING -
INSTALLATION).
REAR A / C EX PAN SI ON VALV E
DESCRIPTION
Th e r ea r A/C expa n sion va lve con t r ols t h e a m ou n t
of r efr iger a n t en t er in g t h e r ea r A/C eva por a t or (F ig.
24). Th e r ea r A/C expa n sion va lve is of a n ext er n a lly-
equ a lized t h er m ost a t ic expa n sion va lve (TXV) design
a n d con sist s of a ca st m et a l body wit h a r em ova ble
equ a lizer t u be a n d a n in t egr a l t h er m a l sen sor wh ich
u ses a ca pilla r y t u be a n d sen sin g bu lb.
Th e r ea r A/C expa n sion va lve is loca t ed t o t h e left
of t h e r ea r blower m ot or s in t h e r ea r eva por a t or
h ou sin g.
E XPANSION VALVE
Fig. 24 Rear A/C Expansion Valve
1 - REAR A/C EXPANSION VALVE
2 - EQUALIZER TUBE
3 - CAPILLARY TUBE
4 - SENSING BULB
OPERA TION
H igh -pr essu r e, h igh t em per a t u r e liqu id r efr iger a n t
fr om t h e liqu id lin e pa sses t h r ou gh t h e expa n sion
va lve or ifice, con ver t in g it in t o a low-pr essu r e, low-
t em per a t u r e m ixt u r e of liqu id a n d ga s befor e it
-
en t er s t h e A/C eva por a t or. A t h er m a l sen sor in t h e
r ea r A/C expa n sion va lve m on it or s t h e t em per a t u r e
of t h e r efr iger a n t lea vin g t h e r ea r eva por a t or by u se
of a sen sin g bu lb posit ion ed n ext t o t h e eva por a t or
ou t let t u be. Th e t h er m a l sen sor a dju st s t h e or ifice
size a t t h e eva por a t or in let t o a llow t h e pr oper
a m ou n t of r efr iger a n t in t o t h e r ea r A/C eva por a t or in
or der t o m eet veh icle coolin g r equ ir em en t s. Con t r ol-
lin g t h e r efr iger a n t flow t h r ou gh t h e A/C eva por a t or
en su r es t h a t n on e of t h e r efr iger a n t lea vin g t h e eva p-
or a t or is st ill in a liqu id st a t e, wh ich cou ld ca u se
da m a ge t o t h e A/C com pr essor.
To over com e t h e effect of t h e pr essu r e dr op wit h in
t h e r ea r A/C eva por a t or, a n ext er n a l equ a lizer t u be is
con n ect ed t o t h e eva por a t or ou t let t u be a n d r u n s t o
t h e u n der side if t h e dia ph r a gm wit h in t h e expa n sion
va lve.
Th e r ea r A/C expa n sion va lve is fa ct or y ca libr a t ed
a n d ca n n ot be a dju st ed or r epa ir ed a n d, if fa u lt y or
da m a ged, it m u st be r epla ced.
PLUMBING 24 - 85