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Some BMW cooling-system maintenance tips are:
BMW Engine and Compartment Tip:
A clean engine runs much cooler, and is easier
to work on, than a grimy one, so keep your BMW
engine and engine compartment-and radiator fins
and grill-as clean as possible.
BMW Coolant Tip:
Change your coolant at or before factory-recommended
intervals, and be sure to use the correct type,
mixture and amount of new coolant. Always let
the cooling system rid itself of air before
you re-install the radiator cap.
BMW Cooling Hose Tip:
Replace all hoses in your BMW’s cooling
system—upper and lower radiator hoses,
bypass hoses, heater hoses, manifold coolant
hoses and any other hoses on your BMW—at
the first hint of a problem. And replace each
hose at least every two years.
BMW Thermostat Tip:
Replace the thermostat with the original temperature-setting
equivalent. The electronics in your vehicle
may use that setting for other controls. Do
not substitute under any circumstances.
BMW Radiator-Tank Cap Tip:
Replace the radiator or expansion-tank cap with
the factory-recommended pressure-setting and
original-equipment equivalent. Some aftermarket
caps will not seal or hold pressure properly
on foreign cars. Don't substitute!
BMW Water-Pump Belt Tip:
Adjust to proper tension, or replace, the external
water-pump drive belt at recommended intervals,
or more often if required. Examine belts any
time you work on any cooling-system component.
BMW Water Pump:
Replace your BMW water pump with an original-equipment
manufacturer/supplier (OEM/OES) pump at the
first sign of a problem, or whenever you have
your BMW’s timing belt and tensioner replaced.
Be alert for signs of overheating—you
don't want a breakdown to strand you in the
hot sun if your water pump has failed.
BMW Fan Clutch Tip:
Replace your BMW fan clutch and/or fan blade
as needed. The temperature gauge is often your
best indicator of when the fan clutch needs
attention.
BMW Temperature Sensor Tip:
Replace temperature sensors when required by
diagnosis. Leave troubleshooting of sensors
to BMW techs who have the required diagnostic
equipment and diagrams.
BMW Maintenance Tip:
Because timing, idle speed, exhaust and other
key systems have an effect on your engine's
temperature, keep the entire vehicle properly
maintained. BMW has designed your cooling system
to function with all other systems operating
properly. It cannot compensate for the effects
of a poorly operating or overheating engine.
BMW cooling-system shopping list
Here are the cooling-system replacement parts
you should consider purchasing when you repair
your BMW cooling system:
Coolant - BMW Water Pump - BMW Thermostat -
Water-Pump Drive Belt (timing belt, V-shaped,
or flat belt) - BMW Hoses (upper and lower radiator,
bypass, heater, manifold coolant hose, and more)
- BMW Radiator - Radiator Expansion Tank - Heater
Core - Control Valves - Temperature Sensors
- Radiator Cap and/or Expansion-Tank Cap - Fan
Clutch
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