MotorVac Cool Smoke EVAP Leak Detection System - Manual (Page 15)

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Other Leak Detection Applications (Cont.)
Wind and Water Leaks from sunroofs, windows and windshields
One of the toughest leaks to find on an automobile is wind / water leaks around the doors, windows, and
sunroofs. It isn’t safe or practical to search for these leaks while driving at highway speeds although that is
when they are most noticeable. Old fashioned ways of locating where the wind and water is entering
the vehicle may identify the leak, but this does not locate the origin of the leak, as you can with
the MotorVac Cool Smoke.
1. Park the vehicle in an area that is shielded from the wind (preferably inside a closed facility).
2. Turn the vehicle’s ignition to the ACCESSORIES position.
3. Turn the heater/AC blower to FRESH AIR and HIGH.
(Verify the blower is NOT set to the re-circulation mode.)
4. Close the vehicle’s doors and windows. The cabin of the vehicle is now under a slight positive pressure.
5. Attach the included diffuser to the end of the tester’s hose.
6. Press the SMOKE button.
7. From outside the vehicle, position the tip of the diffuser about 2 – 3 inches away from the vehicle, and
follow a path along the areas you wish to test. The smoke will linger on the path you are following
until a leak is present. The air exiting the vehicle will cause the smoke to be disrupted, identifying the
source of the leak.
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