DaimlerChrysler LH New Yorker 1994, Электронное руководство по обслуживанию

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SELECTION AND ADDITIVES
The use of aluminum cylinder heads, intake mani-
folds, and water pumps requires special corrosion pro-
tection. Mopar Antifreeze or antifreeze containing
Alugard 340-2, or their equivalent are recommended
for best engine cooling without corrosion. To obtain
the maximum life of components in the engine cooling
system, mixing distilled water with ethylene-glycol
type coolant is recommended. Use (50 percent dis-
tilled water and 50 percent coolant for freezing pro-
tection to -35°C (-30°F) or 40 percent distilled water
and 60 percent coolant where freezing protection to
-50°C (-60 °F) is required. If the coolant looses color or
becomes contaminated, drain, flush, and replace with
fresh properly mixed solution.
SERVICE
Coolant should be changed the first time at 80,000
km (52,000 miles) or three years, whichever occurs
first. Subsequent coolant changes should occur every
two years or 45,000 km (30,000 miles) whichever
comes first.
ROUTINE LEVEL CHECK
Do not remove deaeration pressure bottle cap
for routine coolant level inspections.
The coolant deaeration pressure bottle provides a
quick visual method for determining the coolant level
without removing the pressure cap. With the engine
cold the level of the coolant in the coolant deaeration
pressure bottle (Fig. 6) should be within 12 mm (1/2
in.) of cold fill level mark.
ADDING ADDITIONAL COOLANT
WARNING: DO NOT OPEN COOLING SYSTEM
WHEN HOT AND UNDER PRESSURE BECAUSE
PERSONAL INJURY AND SERIOUS BURNS FROM
COOLANT CAN OCCUR. ALLOW ENGINE TO COOL
BEFORE SERVICING COOLING SYSTEM.
(1) Try squeezing the upper radiator hose to deter-
mine if the system is still pressurized. Continue only
if you are able to squeeze the hose easily; otherwise
wait for the system to cool.
(2) Place a shop towel over the pressure cap on the
coolant deaeration pressure bottle turn to the first
stop. Wait to see if any pressure is released. When no
pressure is released, press down on the cap and turn
fully counter-clockwise.
WARNING: WHEN INSTALLING DRAIN HOSE TO AIR
BLEED VALVE ON THERMOSTAT HOUSING, ROUTE
HOSE AWAY FROM ACCESSORY DRIVE BELT, AC-
CESSORY DRIVE PULLEYS, AND ELECTRIC COOL-
ING FAN MOTORS.
(3) Attach one end of a 6.35 mm (.250 in.) ID clear
hose that is approximately 1219 mm (48 in.) long, to
the bleed valve in the thermostat. Route the hose
away from the accessory drive belt, drive pulleys and
electric cooling fan. Place the other end of hose into a
clean container. The hose will prevent coolant from
contacting the accessory drive belt when bleeding the
system during the refilling operation.
(4) Open bleed valve.
(5) Slowly fill coolant pressure bottle (Fig. 6) until a
steady stream of coolant flows from hose attached to
the bleed valve.
(6) Gently squeeze upper radiator hose until all air
is removed from system.
(7) Close bleed valve and continue filling to 1/2 inch
below base of filler neck of the coolant deaeration
pressure bottle. This will be a level above the cold fill
mark on the bottle.
(8) Install cap on coolant pressure bottle.
(9) Remove hose from bleed valve.
Cooling system will remove trapped air from
itself during normal driving. It is recommended
that lower engine speeds be used to allow the
cooling system to purge itself of any trapped air
for about 20 to 30 minutes before extended op-
eration at high engine speeds (above 4000
RPM).
LOW COOLANT LEVEL
Low coolant level in a cross flow radiator will equal-
ize in both tanks with engine off. With engine at
running and at operating temperature, the high pres-
sure inlet tank runs full and the low pressure outlet
tank drops. If this level drops below the top of the
transmission oil cooler, air will be drawn into the
water pump:
•
Transmission oil will become hotter.
•
High reading shown on the temperature gauge.
•
Air in the coolant will also cause loss of flow
through the heater core.
•
Exhaust gas leaks into the coolant can also cause
the same problems.
Fig. 6 Coolant Deaeration Pressure Bottle
COOLING SYSTEM 7 - 11