Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Air Hose Test

NOTE: The air hose test should only be used on fully cured urethane adhesive. Otherwise, damage to the urethane adhesive bead could result in additional leaks.

1. Use liquid detergent diluted with water in a squirt bottle.




2. Use a helper inside the cab with an air hose.
3. Begin at the bottom window and gradually move up the window edges across the top, and squirt soap solution on the window moldings and the glass on the outside of the vehicle.
4. Use a helper to aim the compressed air at the same locations from the inside of the vehicle.
5. Do NOT exceed the air pressure of 205 kPa (30 psi).
6. Bubbles will form in the soap solution at the location of the leak.