Mityvac MV4534 Manual Del Usuario página 4

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Applications & Basics of Testing
The MV4534 Cooling System Pressure Tester is designed to
diagnose and pinpoint the presence of leaks in an automotive
cooling system. It contains equipment to manually pressurize
and monitor a cooling system. Leaks are indicated by a drop
in pressure over a few seconds or minutes. The location of
external leak(s) is pinpointed by the visible seepage of fluid
resulting from the pressure. Internal leaks, which may not be
visible, typically indicate a blown head gasket or damaged
block or head, and can be diagnosed by monitoring the
pressure during a quick "engine on" test.
Precautions
This equipment is designed for servicing a variety of vehicles
in a safe, convenient manner. However, differences in cooling
systems may make it impossible to perform some of the tests
indicated in these instructions on every vehicle. The procedures
documented in this manual are to serve as guidelines for the use
of this equipment. In addition to these guidelines, always follow
the manufacturer's recommended procedures when
servicing each unique vehicle. Do not attempt to force a test
on a cooling system for which this equipment is not designed
to perform.
Performing cooling system tests using the MV4534 is simple and
straightforward if you follow the instructions. However, always
keep in mind that you are working with a system that may be full
of cold or hot fluid that is under pressure and just waiting to be
expelled. If you are testing an engine that is hot and/or pressur-
ized, always stop to think before pressing the relief valve, remov-
ing a cap, or disconnecting a hose or other component.
Always read carefully and understand instructions prior to using
this equipment.
Always wear eye protection when removing radiator or coolant
bottle cap, or when performing any cooling system test.
Never remove the radiator or coolant bottle cap, or attempt to
pressurize the cooling system of a vehicle that is overheated.
Always allow system to cool prior to attempting to perform any
cooling system related test procedure.
Page Number - 4
Basics of Testing
When deciding where to connect to the cooling system,
first look for the radiator and determine if it has a fill neck
and pressure cap. This is common on about half of US
manufactured vehicles, and almost all Asian manufactured
vehicles, and would be the first choice for connecting. If the
radiator is closed and inaccessible, then the connection will
be made through a coolant bottle. Some automotive cooling sys-
tems utilize a coolant overflow bottle that is not part of the sealed
system. Attempting to test the cooling system through this bottle
will not connect you into the sealed system, and will simply vent
the test pressure to the atmosphere. This type of overflow bottle
is easily recognized because it typically utilizes
a snap-on style cap or a threaded cap that is open to atmo-
sphere. There are no adapters that are designed to fit this type
of coolant overflow bottle. A test connection should be made
through a radiator or coolant bottle with a bayonet or threaded
style of cap designed to maintain a specific pressure in the
cooling system.
Form 801943