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GMC
MOTOR
HOME
SERVICE
SECTION 13
RADIATOR AND COOLANT RECOVERY
SYSTEM
SUBJECT
PAGE NO.
Description . . ... . . ... . . .. . . . .. . . ... . .... . ... . . ... . . .. . . . .. . . ... . .. . . .. . . . .. . . .. . . . .. . . .. . . ... . . ... . . ... . . .... . . .. . . . .... . . .. . . . ... . . . ... . 13-1
Maintenance ... . . ... . .. . . . .. . . . .. . . ... . . ... . .... . ... . . .. . . ... . ... . . .. . .... . ... . ... . . ... . . .. . . . ... . .... . . .. . . . ... . . . .. . . .... . . . .. . . . ... . . 13-1
Radiator Mountings . . . .. . . ... . .. .. . . .. . . . .. . . .. . . . .. . . . . . . . . . . . . . . ... . . . . . . . .. . . .. . . . .. . . ... . . . .. . . ... . . . .. . . . .. .. . . .. . . . ... . . . .. . . 13-2
Radiator Replacement . . . .. . . .. . . . .. . . .... . .. . . . .. . . ... . ... . ... . .... . ... . ... . . ... . . .. . . . .. . . .... . ... . . . .. . . .... . . .... . . . . . . . .... . . 13-2
Pressure Relief Valve and Filler Cap . . . . . . . .. . . .. . . .. . . ... . . .. . . .. . . . .. . . ... . . ... . .... . . .. . . . ... . . ... . . .... . . . .. . . . ... . . 13-3
Coolant Recovery System . .. . . . .. . . ... . .... . ... . .... . ... . ... . ... . .... . ... . .... . ... . . .. . . . ... . . ... . . . . . . . .... . . ... . . . .. . . . ... . . . 13-3
Engine Coolant .. . ... . . . .. . . .. . . ... . . ... . .... . ... . ... . . ... . ... . ... . .... . ... . ... . . ... . . .. . . . .. . . .... . ... . . . .. . . .... . . .... . . . . . . . . ... . . 13-3
Cooling System Pressure Relief Valve .. . .... . ... . ... . ... . ... . . ... . ... . .... . . .. . . . .. . . .... . . .. . . . ... . . . .. . . . ... . . . .. . . .. 13-4
Torque Specifications .. . . ... . . .. . . . .. . . . ... .... . ... . .... . ... . ... . . . .. ... . . ... . . . .. . ... . . . . . . . . . . . . . .. . . . . . . . .... . . .. . . . . .. . . . ... . . . 13-4
Suggested checks are:
NOTE :
Refer to ENGINE COOLING (SECTION 6K) ofthis manual for infor-
mation relative to coolant circulation, temperature indicators, thermostats, and
fan belts.
DESCRIPTION
All GMC Motor Homes are equipped with a
cross-flow radiator also a coolant recovery system .
The level in the coolant recovery reservoir should be
maintained at the "COLD" line when coolant is
cold .
At normal operating temperatures, level can
reach "HOT" line on reservoir. However, should the
coolant level fall below the cold level line, additional
coolant, other than for draining and refill should be
added through the coolant recover reservoir.
MAINTENANCE
At regular intervals, cooling system components
should be inspected to determine if service is re-
quired . Regular systematic checks will reveal faulty
condition of various units and indicate necessity of
servicing or replacement of such components before
failure occurs .
1 . Frequently check coolant level. If low, add
recommended coolant as required .
Contents of this section are listed below:
Refer to GENERAL INFORMATION AND
LUBRICATION (SECTION O) for information
relative to coolant recommendations and coolant
system capacities .
OCTOBER, 1973
2. Check hose connections and tighten clamps if
seeping is evident. Cracked, stripped, or corroded
clamps should be replaced .
3 . Inspect radiator hoses for spongy or checked
appearance . Deteriorated hoses should be replaced
before bursting occurs which would result in coolant
loss and could cause extensive engine damage due to
overheating.
4. Check radiator core for leaks and for accumu-
lation of dirt which obstructs air passages and
reduces effective heat transfer .
To assist in maintaining effecient heat dissipa-
tion, an occasional external flushing with water will
remove majority of dirt accumulation and foreign
matter from between core fins .
Water under moderate pressure should be di-
rected from behind core to force debris out in oppo-
site direction of its entrance . Water should be
directed in line with fins, not sideways, to reduce
possibility of bending fins .
5. Inspect radiator mounting pads for deteriora-
tion and replace as required .
6. Inspect for proper clearance between fan
blades, radiator core venturi ring, and shroud . Check
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