Mityvac MV4525 COOLING SYSTEM TEST & REFILL KIT - Manual (Page 10)

Dynamic Pressure Test (Engine On)
For diagnosing:
Cooling system leaks
Set-up & Procedure:
1. Ensure the cooling system is cool and not pressurized. Carefully
remove the radiator or coolant bottle pressure cap (Fig. 17).
2. Check to see that the radiator or coolant bottle is filled to the
proper level, and check hoses for visual damage or leaks. Fill
and repair as necessary prior to testing.
3. Select the correct Cooling System Adapter for the application.
Refer to the Adapter Selection Guide included in the kit.
4. Apply water or coolant to the rubber gasket and/or o-ring on the
adapter, and install the adapter in place of the pressure cap (Fig.
18).
5. Install the Valve Coupler onto the System Adapter using the
quick-connect. Make sure the quick-connect sleeve snaps
forward to lock the connection (Fig. 19).
6. Install the Coupler Plug into the top of the Valve Coupler and
tighten the threaded cap securely to form an airtight seal (Fig. 20).
7. Connect the Compound Gauge to the quick-connect labeled
“Gauge” extending from the Valve Coupler. Note: It may be
more convenient to install an Extension Hose between the
Valve Coupler and the Gauge (Fig. 21)
8. Ensure the Shuttle Valve on the Valve Coupler is shifted to the
“Closed” position (Fig. 22).
9. Start the vehicle engine and allow it come to normal operating
temperature and pressure.
10. Turn off the engine and allow it to cool with pressure still applied.
Check for leaks as the engine cools. A leak caused by a slightly
loose hose clamp or a stuck hose clamp that gives a false sense
of tightness may only be noticeable during cool down.
11. When testing is complete, connect the Drain Hose to the Shuttle
Valve using the quick-connect. Make sure the quick-connect
sleeve snaps forward to lock the connection (Fig. 23).
12. Place the opposite end of the Drain Hose into a container
appropriate to capture hot, pressurized coolant. Use the
Hose Clip to secure the Drain Hose in position (Fig. 24).
13. Shift the shuttle valve to the “Open” position, allowing the hot
fluid and pressure to be expelled (Fig. 25).
14. Once all pressure is relieved, cautiously disconnect components,
clean and store them properly.
Caution: Hot fluid being expelled through the test equipment will
cause quick-connects and other metal components to become
hot. Handle such components with care, using a rag if necessary.
15. Refill the radiator or coolant bottle to the proper level, and replace
the cap.
Page Number - 10 Form 822947
Fig. 24
Fig. 18
Fig. 20
Fig. 22
Fig. 17
Fig. 19
Fig. 21
Fig. 23
Fig. 25