Engine Cooling System - HUSTLER MDV Operator's Manual

media in the filter must be porous to allow air to pass
through it. When dirty air passes through the filter, the dirt
plugs some of the holes in the media and actually acts as
part of the filter media. When the next round of dirt enters,
the first dirt helps filter out even smaller particles making the
filter more efficient at stopping dirt from entering the engine.
This is referred to as barrier filtration.
Of course, at some point the filter media becomes too
clogged to allow air to pass.
The operating conditions will determine the frequency of
air filter element changing.
Air Restriction Indicator
These units have an air restriction indicator installed in the
air cleaner. Figure 4-15 & Figure 4-17
Replace the element whenever the restriction indicator
reaches the change filter red line. Check the indicator daily
and replace element as needed or annually whichever occurs
first.
Reset the indicator by pushing in on the yellow button after
each element change. Figure 4-17

Engine Cooling System

IMPORTANT: Refer to the Safety Precautions section of this
manual for coolant safety information.
The engine coolant recovery system controls the engine
coolant level. This system consists of the overflow tank, radi-
ator filler neck, radiator cap, and hose.
New vehicles or vehicles that have just had the coolant
system flushed may need to have a small amount of coolant
added after a short period of operation. This is due to the
system purging itself of trapped air. When this occurs add
coolant to the overflow tank until the proper coolant level is
attained.
Engine cooling is accomplished with circulated water and
Ethylene Glycol mixture. A 50-50 mixture is recommended for
all season operation. This mixture provides freeze protection
to -32 degrees F (-35 degrees C). Should temperatures fall
below this level, additional Ethylene Glycol must be added to
the mixture.
The radiator is located under the hood and cargo tray at
the front of the vehicle. Figure 4-18
The radiator cap and overflow tank are located on the right
front of the firewall under the hood. Figure 4-18
Visually inspect the system daily prior to operating the
vehicle. With the vehicle parked on a level surface check the
coolant level in the overflow tank.
REV A
When the engine is cold there should be a small amount of
coolant on the bottom of the overflow tank. If coolant level is
low add the appropriate solution.
Do not remove the radiator cap while the coolant is
hot.
Allow coolant to cool then, slowly turn radiator cap
to the first stop to let the excess pressure escape.
Finish removing the cap.
When re-tightening the radiator cap make sure it is
securely in place.
When adding coolant, pre-mix the solution before adding it
to the overflow tank. It is not necessary to remove the radia-
tor cap for adding small amounts of coolant to the system.
Do not overfill. Figure 4-18
C
A. Radiator cap
B. Overflow tank
There may be a leak in the system if it is necessary to add
coolant frequently of if the overflow tank runs completely
dry. If this occurs have the coolant system inspected by an
authorized Hustler Dealer.
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Radiator Coolant Level
Follow these steps when adding coolant to the radiator
after the cooling system has been drained.
1. Park the vehicle, engage the park brake, and shut the
engine off. Remove the key from the ignition switch.
2. Raise the hood.
3. Allow coolant to cool then, slowly turn radiator cap to the
first stop to let the excess pressure escape. Finish
removing the cap.
4. Check the coolant level in the radiator hose.
5. Slowly add coolant as necessary.
6. Re-install the radiator cap. Make sure to use a Hustler
approved pressure cap when replacing a cap.
4-8
B
D
A
C. Cargo tray
D. Full "COLD" bracket
Figure 4-18
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