Relieving radiator pressure, Page 5 – MAHLE RTI MCX-2 (Rev G) User Manual
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Black Hose
Green Hose
Radiator
Pump
Water
Overflow
Clear Hose
Radiator
Hose
Engine
Core
Heater
Block
EXC
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NG
E C
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LA
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RELIEVING RADIATOR PRESSURE
WARNING: Coolant in the vehicle cooling system may be extremely hot and
under great pressure. Wear safety glasses and use protective
clothing and gloves. Use extreme caution when removing
radiator cap and hoses.
NOTE: The MCX-2S does not need to be connected to power for the following.
The MCX-2S will relieve the pressure in a hot-car radiator by drawing a vacuum on the
overflow port on the radiator cap.
Connect shop air (55 to 100 PSI) to the port on the rear of the MCX-2S. This will cause
a vacuum to be pulled on the small diameter clear hose, also connected to the rear.
Connect clear hose to the overflow port on the radiator cap as shown above.
The system Vacuum Gauge on the MCX-2S control panel indicates the vacuum level
which will increase until the radiator cap opens and relieves the pressure. As the
pressure releases a small amount of coolant will be seen flowing in the clear hose.
When the pressure has been relieved, the radiator cap will again close and the vacuum
level will increase and become steady on the gauge.
The radiator cap can now be slowly and carefully removed.
Disconnect shop air from rear port.