3-12 Chapter 3 Cooling, heating and air conditioning systems
14.12 Place a thermometer in the right-side dashboard vent
to monitor cooling
16.5a Remove these four bolts (arrows) to disconnect the
refrigerant lines from the compressor (far left bolt hidden
from view by connector) (1967 an&earlier models)
4 The most common cause of poor cooling is simply a low system refrig-
erant charge. If a noticeable drop in cool air output occurs, the following
quick check will help you determine if the refrigerant level is low.
5 Warm the engine up to normal operating temperature.
6 Place the air conditioning temperature selector at the coldest setting
and put the blower at the highest setting. Open the doors (to make sure the
air conditioning system doesn’t cycle off as soon as it cools the passenger
compartment).
7 With the compressor engaged-the clutch will make an audible click
and thecenterof the clutch will rotate-inspect the sight glass, if equipped,
which is located on the receiver/drier (see illustration). If the refrigerant
looks foamy, its low. Have a dealer service department or licensed aircon-
ditioning repair facility charge the system.
8 If there’s no sight glass, feel the inlet and outlet pipes at the compres-
sor. One side should be cold and one hot. If there’s no perceptible differ-
ence between the two pipes, there’s something wrong with the
compressororthesystsm. It mightbealowcharge-it might besomething
else. Take the vehicle to a dealer service department or an automotive air
conditioning shop.
15 Air conditioning receiver/drier - removal and installation
Warning: The air conditioning system is under high pressure. DO NOT
disassemble any part of the system (hoses, compressor, line fittings, etc.)
until after the system has been depressurized by a dealer service depart-
ment or service station.
1 The receiver/drier, which acts as a reservoir for the refrigerant, is the
cannister-shaped object mounted either in the engine compartment or in
front of the condenser (see illustration 14.7).
2 Before removing the receiver/drier, the system must be discharged
by an conditioning technician (see Warningabove). DO NOTattempt to do
this yourself; the refrigerant used in the system can cause serious injuries
and respiratory irritation.
3 Loosen the hose clamps and remove both hoses from the receiver/
drier.
4 loosen the clamp and pull up on the receiver/receiver to remove it
from its mount.
5 When installing the receiver/drier, lubricate the inside surfaces of the
hoses and the outside of the fittings with refrigerant oil. Be sure the hose
clamps are properly located by the clamp finders and securely tightened.
6 Have the system evacuated, recharged and leak tested by the shop
that discharged it.
-z
16 Air conditioning system compressor - removal
and installation
Refer to illustrations i6.5a and 16.5b
Warning: The air conditioning system is under high pressure. DO NOT
disassemble anypatt of the system (hoses, compressor, line fittings, etc.)
untilafter the system has been depresswized by a dealer service deparf-
mentor service station.
1 Have the air conditioning system discharged (see Warningabove).
2 Disconnect the negative battery cable from the battery.
3 Disconnect the compressor clutch wiring harness.
4 Remove the drivebelt (see Chapter 1).
5 Disconnect the refrigerant fines from the rear of the compressor. Plug
the open fittings to prevent entry of dirt and moisture (see illustrations).
6 Unbolt the compressor from the mounting bracketsand lift it out of the
vehicle.
7 A a new compressor is being installed, follow the directions with the
compressor regarding the draining of excess oil prior to installation.
8 The clutch may have to be transferred from the original to the new
compressor.
9 installation is the reverse of removal. Replace all O-rings with new
ones specifically made for air conditioning system use and lubricate them
with refrigerant oil.
IQ Have the system evacuited, recharged and leak tested by the shop
that discharged it.
17 Air conditioning system condenser - removal
and installation
Warning: The air conditioning system is under high pressure. DO NOT
disassembleanypartof the system (hoses, compressor, fine fittings, etk)
unfilaffer the system has been depressurized by a dealer service depart-
ment or service station.
1 Have the air conditioning system discharged (see Warningabove].
2 Remove the battery (see Chapter 5).
3 Drain the cooling system (see Chapter 1).
4 Remove the radiator (see Chapter 3).
5 Disconnectthe refrigerant lines from thecondenser(seeillustration
16.5b).
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