Dodge Sprinter 2006 Manual page 2065

VA
Fig. 10 Rear A/C Low Pressure Switch
1 - INSULATING TAPE
2 - REAR A/C EVAPORATOR HOUSING
3 - WIRE HARNESS CONNECTOR
4 - REAR A/C LOW PRESSURE SWITCH
5 - REAR SUCTION LINE FITTING
INSTALLA TION
NOTE: Replacement of the PTFE thread sealing
tape is required anytime the rear A/C low pressure
switch is removed from the rear suction line line.
Failure to replace the sealing tape could result in a
rear refrigerant system leak.
(1) Rem ove t h e t a pe or plu g fr om t h e r ea r su ct ion
lin e fit t in g.
(2) In st a ll P TF E t h r ea d sea lin g t a pe on t o t h e r ea r
A/C low pr essu r e swit ch a n d in st a ll t h e swit ch on t o
t h e r ea r su ct ion lin e. Tigh t en ed t h e A/C low pr essu r e
swit ch t o 10 N·m (88 in . lbs.).
(3) Con n ect t h e wir in g h a r n ess con n ect or t o t h e
r ea r A/C low pr essu r e swit ch .
(4) In st a ll n ew in su la t in g t a pe a r ou n d t h e r ea r A/C
low pr essu r e swit ch a r ea .
(5) Recon n ect t h e n ega t ive ba t t er y ca ble.
(6) E va cu a t e t h e r ea r r efr iger a n t syst em (Refer t o
24 - H E ATING & AIR CONDITIONING/P LUMBING
- STANDARD P ROCE DURE - RE F RIGE RANT SYS-
TE M E VACUATE ).
(7) Ch a r ge t h e r ea r r efr iger a n t syst em (Refer t o 24
- H E ATING & AIR CONDITIONING/P LUMBING -
STANDARD P ROCE DURE - RE F RIGE RANT SYS-
TE M CH ARGE ).
(8) In st a ll t h e cover 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 CONDI-
TIONING/DISTRIBUTION - RE AR/A/C E VAP ORA-
TOR COVE R-RE AR - INSTALLATION).
BLOWER M OT OR RELAY
DESCRIPTION
Th e t h r ee r ea r blower m ot or r ela ys u sed for t h e
r ea r A/C syst em a r e In t er n a t ion a l St a n da r ds Or ga n i-
za t ion (ISO)-t ype r ela ys (F ig. 11). Rela ys con for m in g
t o t h e ISO specifica t ion s h a ve com m on ph ysica l
dim en sion s, cu r r en t ca pa cit ies, t er m in a l fu n ct ion s
a n d pa t t er n s. Th e r ea r blower m ot or r ela ys a r e elec-
t r om ech a n ica l devices t h a t swit ch es fu sed ba t t er y
cu r r en t dir ect ly t o t h e r ea r blower m ot or s. Th e r ea r
blower m ot or r ela ys a r e en er gized wh en t h e r ela y
coils a r e pr ovided ba t t er y cu r r en t by t h e r ea r blower
m ot or swit ch (Refer t o 24 - H E ATING & AIR CON-
DITIONING/CONTROLS/BLOWE R
SWITCH - DE SCRIP TION).
Th e r ea r blower m ot or r ela ys a r e loca t ed in t h e
r ela y block in t h e r ea r A/C eva por a t or h ou sin g.
Fig. 11 Rear Blower Motor Relays
1 - STANDARD ISO RELAY
2 - TERMINAL PATTERN
OPERA TION
Th e t h r ee ISO-st a n da r d r ea r blower m ot or r ela ys
a r e elect r om ech a n ica l swit ch es t h a t u ses a low cu r-
r en t in pu t fr om t h e r ea r blower m ot or swit ch t o con -
t r ol t h e h igh cu r r en t ou t pu t t o t h e r ea r blower
m ot or s. Th e m ova ble, com m on feed r ela y con t a ct is
h eld a ga in st t h e fixed, n or m a lly closed r ela y con t a ct
by spr in g pr essu r e. Wh en t h e elect r om a gn et ic r ela y
coil is en er gized, it dr a ws t h e m ova ble com m on feed
r ela y con t a ct a wa y fr om t h e fixed, n or m a lly closed
r ela y con t a ct a n d, h olds it a ga in st t h e fixed, n or m a lly
open r ela y con t a ct . Th is a ct ion a llows h igh cu r r en t t o
flow t o t h e r ea r blower m ot or s.
Wh en t h e r ela y coil is de-en er gized, spr in g pr es-
su r e r et u r n s t h e m ova ble r ela y con t a ct ba ck a ga in st
t h e fixed, n or m a lly closed con t a ct poin t . Th e r esist or
CONTROLS - REAR 24 - 33
MOTOR