DaimlerChrysler LH New Yorker 1994, Электронное руководство по обслуживанию

Страница: 11 / 1203

The engine cooling system will develop internal
pressure of 97 to 123 kPa (14 to 18 psi) at normal
operating temperature. Allow the vehicle approxi-
mately one half hour to cool off before opening the
cooling system. As an indicator of pressure, squeeze
the upper radiator hose between index finger and
thumb. If it collapses with little effort the system
would have low internal pressure and should be safe
to open to the first safety notch of the coolant pres-
sure bottle cap. Refer to Group 7, Cooling System.
COOLING SYSTEM INSPECTION
Coolant level (Fig. 5) should be inspected when
other engine compartment service is performed or
when coolant leak is suspected. Coolant pressure
bottle level should be inspected when the engine is
cold. The COLD FILL LEVEL mark is located on the
side of the coolant pressure bottle. Cooling system
freeze protection should be tested at the onset of the
winter season or every 12 months. Service is required
if coolant is low, contaminated, rusty or freeze protec-
tion is inadequate. To properly test cooling system,
see Group 7, Cooling System.
The cooling system factory fill is a mixture of 50%
Glycol base antifreeze with silicate inhibitor and 50%
water. Using a suitable hydrometer, measure anti-
freeze concentration in the coolant pressure bottle
when the engine is cool. If the cooling system has
recently been serviced, allow coolant to circulate for
at least 20 minutes before taking hydrometer reading.
Properly mixed coolant will protect the cooling system
to -37°C (-35°F). If the freeze protection is above
-28°C (-20°F), drain enough coolant from the cooling
system to allow room to add antifreeze to achieve
adequate protection. A mix table on the coolant con-
tainer indicates the amount of antifreeze required to
winterize the cooling system based on the capacity,
see Capacity Chart in General Information section of
this group.
SELECTING ANTIFREEZE
Chrysler Corporation recommends Mopar
Antifreeze/Summer Coolant, or equivalent be used to
winterize and protect cooling system.
PRESSURE CAP
The pressure cap must be secure for the engine
cooling system to perform properly. Inspect and test
pressure cap when cooling system service is per-
formed or when a problem is suspected.
COOLING SYSTEM SERVICE
The cooling system should be drained, flushed and
filled with the proper coolant mixture at the intervals
described in the Lubrication and Maintenance Sched-
ules. Refer to General Information section of this
group. For proper service instructions see Group 7,
Cooling System.
ENGINE AIR CLEANER
The engine air cleaner should be serviced at the
intervals described in the Lubrication and Mainte-
nance Schedules. Refer to General Information sec-
tion of this group. Additional information can be
found in Group 14, Fuel System and Group 25, Emis-
sion System. Inspect all air cleaner hoses or tubes for
damage or leaks when other engine compartment ser-
vice is performed. Replace faulty components.
AIR CLEANER SERVICE
CAUTION: The air cleaner cover must be installed
properly for the emissions system and engine con-
troller to function correctly.
Do not immerse paper air filter element or tem-
perature sensor in cleaning solvents, damage can
result.
TO SERVICE AIR CLEANER
(1) Raise hood of vehicle and inspect all air cleaner
components for damage or improper attachment.
(2) Remove air cleaner lid (Fig. 6).
(3) Remove paper air filter element from air
cleaner body. Hold a shop light on throttle body side
of element. Inspect air intake side of element. If light
is visible through element, blow dust from element
(Fig. 7) and reuse. If element is saturated with oil or
light is not visible, replace filter. If element is satu-
rated with oil, perform crankcase ventilation system
tests. Refer to Group 25, Emission Control Systems
for proper procedure.
Fig. 5 Coolant Pressure Bottle
0 - 10 LUBRICATION AND MAINTENANCE