Mityvac MV4525 COOLING SYSTEM TEST & REFILL KIT - Manual (Page 7)

Static Pressure Test (Engine Off)
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.1).
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. 2).
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. 3).
6. Install the Coupler Plug into the top of the Valve Coupler and
tighten the threaded cap securely to form an airtight seal (Fig. 4).
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. 5).
8. Connect the Pressure Pump to the quick-connect labeled
“Pressure/Vacuum” extending from the Valve Coupler. Note: It
may be more convenient to install an Extension Hose between
the Valve Coupler and the Pump (Fig. 6).
9. Ensure the Shuttle Valve on the Valve Coupler is shifted to the
“Closed” position.
10. Operate the Pressure Pump until the needle on the Compound
Gauge moves to the end of the colored band indicating the
appropriate pressure range (see Chart A) of the cap (Fig. 7).
11. Watch the gauge for a short period of time. If the pressure
reading drops, a leak is present.
12. With the system still pressurized, perform a visual inspection
of the entire cooling system. Check hoses and connections
for seepage, which would indicate a leak. Return to the gauge
and check the reading once more.
13. Most leaks are external, and visible seepage occurs. However,
a drop in pressure with no visible leakage can indicate a blown
head gasket or cracked block, where fluid leaks into the
combustion chamber. Visually inspect oil and transmission fluid
for signs of coolant. Proceed to the Dynamic Pressure Test for
better methods of diagnosing internal leaks.
14. When testing is complete, shift the Shuttle Valve to the “Open”
position to relieve system pressure (Fig. 8).
15. Disconnect components, clean and store them properly.
16. Refill the radiator or coolant bottle to the proper level, and replace
the cap.
Form 822947 Page Number - 7
Fig. 7
Fig. 2
Fig. 4
Fig. 6
Fig. 8
Fig. 1
Fig. 3
Fig. 5
Chart A: Cooling System Cap Pressure Test Ranges
Rated Pressure (PSI) Pressure Test Range (PSI)
4 3 - 5
7 6 - 8
10 9 - 11
13 or 14 12 - 16
15 or 16 14 - 18
18 16 - 20
20 18 - 22
30 28 - 30