Aluminum Radiator Repair - GMC G Service Manual

ALUMINUM RADIATOR REPAIR

DESCRIPTION
This radiator utilizes an aluminum core with plastic side
tanks. The core and side tanks can be replaced separately
and core repair is easily made with the hot-melt adhesive
method. A transmission oil cooler is located in one of the
side tanks. The oil coolers can be replaced. The drain cock
is located on the lower part of one of the tanks. The drain
cock is also serviceable.
CORE
The core is made of aluminum and is of the crossflow
design. It utilizes large tubes that resist plugging, and
repairs to the tubes and core are easily made using the hot-
melt adhesive method.
The core is attached to the tanks by clinched tabs on the
core that can be bent back if tank or core replacement is
required.
If the damage to a tube is too severe, a tube can be
blocked or plugged as explained in Tube Blocking" in this
section. No more than two tubes should ever be blocked on
a core. Also replace the core if more than three tabs are
broken on one side or if two adjacent tabs are broken.
118
110. Core
111. Outlet Tank
112. Inlet Tank
113. Side Tank Gasket
114. Engine Oil Cooler (Located On Right Side For
R/V Models With 6.2L Diesel)
115. Transmission Oil Cooler (Located On Left Side For
R/V Models With 6.2L Diesel)
116. Cooler Gasket
117. Cooler Retaining Nuts
118. Drain Cock
113
Figure 21 — Radiator Assembly
RADIATOR 6B2-17
TANKS
The tanks are attached to the core by clinched tabs
attached to the sides of the core. The clinched tabs can be
bent back if the tanks need to be removed from the core.
Bend the tabs back only enough to remove the tank.
Overbending will weaken the tabs.
A high-temperature rubber gasket is used to seal the
mating surface between the core and the tank (figure 21).
The gasket must be replaced any time a tank is removed
from the core.
TRANSMISSION OIL COOLER
Replace the oil cooler by removing the tank from the
core.
A leaking oil cooler gasket can be replaced without
removing the tank from the core.
DRAIN COCK
The aluminum/plastic radiator utilizes a two piece plastic
drain cock and a rubber seal. The drain cock is serviceable
(figure 22).
L00789