Table of Contents
Advertisement
HEATER AND AIR CONDITIONING 1A-50
Fig. 64—Receiver-Dehydrator Mounting (Corvette)
3.
4.
5.
6.
To gain access to the blower motor end of the as-
sembly, remove the fender and skirt.
Remove the assembly to firewall attaching screws.
Remove the entire assembly from the vehicle.
Reverse the above procedure when installing the
assembly into the vehicle.
Core Replacement
1. Disconnect the connections at the suction throttling
valve inlet and the expansion valve outlet. Remove
the expansion valve bulb from the core outlet line.
Cap all open lines. .
Remove the screws attaching the evaporator cover
to the firewall and to the evaporator assembly and
remove the cover.
Remove the screws attaching the core to the assem-
bly and remove the core.
Reverse the above steps for core replacement.
Add three fluid oz. refrigerant after installing a
new core, evacuate and charge the system.
2.
3.
4.
5.
Comfortron
The evaporator assembly is nearly identical to that
of the Four-Season system, and, with the exception of
additional wiring and vacuum hoses, service procedures
are the same.
Chevelle Four-Season System
Removal
• 1. Purge the system of refrigerant, then remove the
right fender skirt and the hood hinge. Do not remove
the fender.
2. Disconnect the high pressure line (between the
receiver-dehydrator and the thermostatic expansion
valve) at the expansion valve, and the suction throt-
tling valve to compressor line at the suction throt-
tling valve. Cap and seal all open lines.
3. Remove the three screws attaching the duct assembly
to the evaporator housing and the blower assembly.
4. Remove the bolts attaching the evaporator assembly
to the cowl and carefully pull the assembly from the
vehicle. The duct assembly will be removed at this
time also.
Core Replacement
1. With the evaporator assembly removed from the
vehicle, remove the expansion valve and its bulb.
2. Remove the four nuts and bolts holding the two
halves of the evaporator housing together and sepa-
rate the halves.
3. The evaporator core may now be removed.
4. Leak test the new core and connections, before in-
stalling the core in the housing, by installing the
expansion valve and all refrigerant lines. Connect an
R-12 cylinder to the low pressure compressor gauge
fitting and charge the system to cylinder pressure,
then leak test.
5. After satisfactorily testing the core, install it into
the housing and reassemble the two sides of the.
housing.
Installation
1. Remove the right trim pad and the screws attaching
the air conditioning duct to the kick panel. This
should allow the duct to be pulled slightly loose from
the kick panel. If not it may be necessary to loosen
the entire duct to obtain the necessary clearance.
2. Install the evaporator in the cowl being sure that
the duct assembly is in place between an evaporator
housing and the blower assembly.
3. Replace all bolts and screws.
4. Move the interior air conditioning duct until sure
that the duct gasket is properly positioned over the
evaporator housing flange. Proper gasket fit at this
point is of great importance.
5. Replace all refrigerant lines.
6. Evacuate and charge the system. Add three fluid oz.
refrigerant oil after installing a new core.
7. Replace the fender skirt and hood hinge.
Universal System All Vehicles
Core and/or Expansion Valve Replacement
Since repairs should never be made on the evaporator
core, a defective unit must be replaced. Before replacing
the core, however, check to be sure that any leaks pres-
ent are not located at the hose connections or expansion
valve connections.
CHEVROLET CHASSIS SERVICE MANUAL
Advertisement
Table of Contents
