Table of Contents
Advertisement
EVAP/LOW PRESSURE
VERIFY REPAIRS
PERFORM DECAY / LEAK DOWN TEST
Pressurize the sealed system
Lock out sealed system by turning Flow Control Knob clockwise to the fully closed position
OBSERVE PRESSURE GAUGE FOR DECAY:
Pressure Holds: No leaks, Repair is complete
Pressure Decreases: Leak(s) exist, Repair and retest until all repairs are complete
NOTE: Not all systems are designed to be 100% sealed
How To Diagnose Exhaust Leaks
This test is most effective when exhaust system is cold
Thermal expansion may cause small leaks to seal
1. Insert appropriate Cone Adaptor into the end of the tailpipe
If the vehicle has dual exhaust with cross over system, plug the other tailpipe to seal the system
2. Put Vapor Output Hose into Cone Adaptor to introduce vapor into the system
A hot catalytic converter may consume some of the vapor
All testing is performed with the engine off
!
How To Diagnose Under Dashboard Leaks
Many vehicles have a common vacuum line, leading from the engine compartment through the fire wall,
under the dashboard. This line supplies vacuum to climate control functions and other vacuum-
operated systems.
1. Disconnect the vacuum line under the hood at its source
2. Input vapor into the vacuum line
3. Observe the Flow Meter and Pressure Gauge while changing the climate controls from heat to vent,
to defrost, etc.
4. Change in the Flow Meter or Pressure Gauge's reading will indicate which system is leaking
5. Set the climate control to the leaking system
6. Use provided Halogen Inspection Light to locate under dash leaks
TESTING FOR LEAKS
7
Advertisement
Table of Contents
