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VA
FUEL LINE (Continued)
NOTE: Do not activate the Dosing Pump Prime
more than one time. This will put excess fuel in the
DCHA Heater Module an cause smoke to emit from
the DCHA exhaust pipe when heater activation
occurs.
NOTE: A clicking noise heard coming from the dos-
ing pump indicates that the pump is operational.
(7) With the DRBIII
select System Tests and Dosing Pump Prime. Allow
the dosing pump to run for the full 45 second cycle
time. When the 45 second cycle is complete, press
Page Back on the DRBIII scan tool key pad to exit
the Dosing Pump Prime. The Dosing Pump Priming
procedure is now complete.
HEATER UNIT
REMOVAL
REMOVAL
WARNING: ALLOW THE SUPPLEMENTAL HEATER
TO COOL BEFORE PERFORMING A COMPONENT
INSPECTION/REPAIR OR REPLACEMENT. FAILURE
TO FOLLOW THESE INSTRUCTIONS MAY RESULT
IN PERSONAL INJURY.
WARNING: ALLOW THE EXHAUST SYSTEM TO
COOL BEFORE
PERFORMING A COMPONENT
INSPECTION/REPAIR OR REPLACEMENT. FAILURE
TO FOLLOW THESE INSTRUCTION MAY RESULT IN
PERSONAL INJURY.
(1) Raise and support the vehicle. Take note of the
location of the flexible exhaust tube section.
(2) Drain the engine cooling system (Refer to 7 -
COOLING - STANDARD PROCEDURE).
(3) Carefully open one hose to the underbody tube
assembly and drain the remaining coolant. A salvage
hose is a good idea to control the residual coolant, as
flow will occur from both the heater and the hose and
tube assemblies.
(4) Remove the second hose from the underbody
hose and tube assembly.
(5) Loosen the hose and tube assembly from the
toe-board cross member at two locations.
(6) Disconnect the electrical connector from the
body harness near the toe-board cross member and
rail.
scan tool in Cabin Heater,
(7) Remove the wiring harness from the toe-board
cross member (Refer to 24 - HEATING & AIR CON-
DITIONING/CABIN
REMOVAL).
(8) Open the fuel filler cap. Disconnect the rubber
fuel hose between the body tube assembly and the
fuel pump nipple at the body tube joint. A minimal
amount of fuel may flow from the open port.
NOTE: Utilize an approved fuel storage container to
catch any residual fuel.
(9) Loosen the two fasteners at the rail. Take care
to notice that the exhaust tube bracket tab is on top
of the heater bracket and that there are two spacer
washers installed between the rubber grommets.
(10) Remove the heater exhaust tube flex section
from the exhaust tube by loosening the bolt of the
clamp assembly. Remove the hose from the exhaust
tube. Removal of the rail tube assembly may aid in
this service operation (Refer to 24 - HEATING & AIR
CONDITIONING/CABIN HEATER/EXHAUST TUBE
- REMOVAL).
(11) Remove seat hex nut at the heater mounting
flange to cross member.
(12) Loosen the remaining fasteners which mount
the exhaust tube assembly to the vehicle.
(a) Install a suitable cabin heater support device
under the cabin heater and secure the cabin heater
to the device.
(13) Loosen the remaining three fasteners to the
cross members.
(14) Remove the loosened fasteners that support
the heater while supporting the weight of the heater.
(15) Swing
the
unit
between the exhaust bracket and rail mounting loca-
tion. Drain any residual coolant from the heater unit.
(16) Lower the cabin heater and remove from the
supporting device and place on a suitable work area.
REMOVAL
(1) Raise and support the vehicle while taking note
of the location of the flexible exhaust tube section.
(2) Unplug the wire harness connector from vehi-
cle wiring harness to cabin heater harness.
(3) Unplug the wire harness connector from cabin
heater harness to dosing pump connector.
(4) Unplug the two wire harness connectors from
cabin heater harness to cabin heater controller con-
nectors.
(5) Remove two wiring harness connectors from
underbody.
(6) Remove two wiring harness connectors from
cabin heater shield.
(7) Carefully route the cabin heater harness to the
left side between the cabin heater unit and the cabin
heater shield.
CABIN HEATER 24 - 77
HEATER/HEATER
UNIT
mounting
bracket
-
from
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