Vacuum Leak Test - Mityvac MV4535 Manuel D'utilisation

Vacuum Leak Test

For diagnosing:
Cooling system leaks
Notes
This equipment uses a venturi vacuum to perform a vacuum leak
test. The venturi requires clean, dry, high pressure air between 90
and 120 psi (5.5 - 10 bar) (550 - 1000 kpa) to create the vacuum.
Prior to testing, install a male quick-change air nipple with 1/4" NPT
male thread to the venturi.
The altitude at which the vacuum test is performed can significantly
affect the ability of the venturi to produce a vacuum. As the altitude
increases, the maximum vacuum the venturi can create will decrease.
This is normal and should not be considered a malfunction.
It is recommended that the cooling system be drained of coolant
prior to performing a vacuum leak test and automatic refill.
When connecting components using quick-connects, make sure
the sleeve snaps forward to lock the connection.
Set-up & Procedure:
1. Properly position the vehicle for service access to the radiator
or coolant bottle. Turn on the heater and set it to its highest
temperature setting.
2. Ensure the cooling system is cool and not pressurized. Carefully
remove the radiator or coolant bottle pressure cap (Fig. 1).
3. Insert the Universal Radiator Adapter into the neck of the radiator
or coolant bottle (Fig. 2).
4. Install the Valve Coupler onto the Universal Radiator Adapter
using the quick-connect. Make sure the quick-connect sleeve
snaps forward to lock the connection (Fig. 3).
Note: It may be more convenient to install an Extension Hose
between the adapter and the coupler.
5. Install the Coupler Plug into the top of the Valve Coupler and
tighten the threaded cap securely to form an airtight seal (Fig. 4).
6. Connect the Vacuum Gauge to the male quick-connect labeled
"Gauge" extending from the Valve Coupler.
Note: It may be more convenient to install an Extension Hose
between the coupler and the gauge (Fig. 5).
7. Connect the Venturi Vacuum to the male quick-connect labeled
"Pressure/Vacuum" extending from the Valve Coupler (Fig. 6).
Note: It may be more convenient to install an Extension Hose
between the coupler and the vacuum.
8. Ensure the Shuttle Valve on the Valve Coupler is shifted to the
"Closed" position (Fig. 7).
9. Connect clean, dry, regulated compressed air between 90 and
120 psi (6.2 and 8.3 bar) (600 and 830 kPa) to the Venturi
Vacuum by means of the previously installed air nipple (Fig. 8).
Page Number - 6
Fig. 1
Fig. 3
Fig. 5
Fig. 2
Fig. 4
Fig. 6
Fig. 7
Fig. 8
Form 822954