Chevrolet Light Duty Truck 1973 Service Manual page 98

1A-72 HEATER A ND AIR C O N D IT IO N IN G
SU CTIO N PRESSURE (PSIG)
N O TE: For gauges c a lib ra te d in inches Hg vacuum , d ivid e
ga u g e re a d in g by 2 .3 0 6 to o b ta in PSIG.
Fig. 84-Superheat Switch Calibration Chart
link, a wire wound resistor and three spade type
electrical terminals, potted with epoxy in a plastic
housing. The terminals are positioned for in-line plug-on
connection with a wiring harness. The thermal fuse
construction provides for a time delay in blowing the
fuse link which prevents "blown fuse" nuisance due to
m om entary switch contact closings during certain
transient conditions.
A blown thermal fuse indicates that the air conditioning
system is either low or completely out of refrigerant
charge, a m alfunctioning expansion valve
improperly located thermal limiter.
CIRCUIT BREAKER
The entire air conditioning system is protected by a 45
amp circuit breaker located on the left side of the dash,
in the engine compartment.
This system is used in conjunction with the floor
mounted system. Since replacement of the floor Mounted
System Components has been covered previously, only
TOLERANCE ZONE
or an
C O M P O N E N T PART REPLACEMENT
OVERHEAD SYSTEM -G MODELS
Fig. 85--Thermal Fuse
those components peculiar to the Overhead system will
be covered in this section.
LIGHT DUTY TRUCK SERVICE MANUAL