www.fierottop.com -- Waterleak Manual -- Page 4

Diagnostic Chart

LEAK AREA	SYMPTOM	CAUSE	RESOLUTION
1, 2	"A" and/or "B" pillar butt joint roof weatherseal to rail weatherseal water coming in where seals meet.	1) Misaligned weatherseals. 2) Door glass not making good contact or too high causing seperation.	1) Reposition roof weatherseals to glass panels rail weatherseal, refer to pages 5, 6, 7. 2) Readjust door glass, refer to page 5.
1, 2	"A" or "B" pillar trim cap leak. Water coming out of the bottom of the trim caps or running down the inside of the "A" pillar trim molding or 1/4 trim panel.	1) Lack of sealer in the roof drain at the upper "A" and "B" pillars. 2) Lack of sealer in the upper "A" and "B" pillar retainers.	1) Reseal roof drains, refer to page 10. 2) Reseal upper "A" & "B" pillar retainers. Refer to page 8.
3	Glass panel to roof weatherseal compression leak, water or air coming in between the glass panel and the roof weatherseal.	1) Glass panel out of adjustment. 2) "A" or "B" pillar trim caps damaged. 3) Roof weatherseal damaged. 4) Lack of sealer at the rail weatherseal tabs. 5) Roof drains clogged.	1) Readjust glass panel, refer to page 6. 2) Replace "A" or "B" pillar trim cap. 3) Replace roof weatherseal. Refer to pages 7 & 8. 4) Reseal rail weatherseal tabs. Refer to page 9. 5) Unclog roof drains. Refer to page 10.
3, 7, 8, 9	Headliner leak. Water coming thru dome light or third tail light soaking headliner.	1) Lack of sealer in the roof drain. 2) Roof drain channels clogged. 3) Lack of sealer under center bar. 4) Lack of sealer under rear roof molding.	1) Reseal roof drain, refer to page 10. 2) Unclog roof drains. Refer to page 10. 3) Reseal center bar. Refer to page 15. 4) Reseal rear roof molding. Refer to page 12.
4, 5	Lower door seal "A" and/or "B" pillar leak. Water filling the rocker area of lower door seal and running over the rocker trim panel.	1) Lower "A" or "B" pillar roof w/seal not making contact with door or door glass. 2) Lack of sealer at the roof weatherseal to lower door seal overlap. 3) Roof weatherseal damaged.	1) Build out roof weatherseal at the lower pillar. Refer to page 10. 2) Reseal roof weatherseal at the door seal overlap. Refer to page 8. 3) Replace roof weatherseal. Refer to page 7 & 8.
5	Wind noise at lower "A" pillar roof weatherseal or water coming in lower "A" pillar retainers at break.	1) Lower "A" pillar retainer damaged or bent. 2) Roof weather seal not tucked into retainer. 3) "A" or "B" butt joint leak.	1) Readjust or replace lower "A" pillar retainer. Refer to page 8 2) Reinstall weatherseal to retainers. Refer to page 8. 3) Reseal roof weatherseal at lower "A" pillar retainer split. Refer to page 8.
6	T-roof glass panel leak. Water filling the inside of the latch cover or along the rail weatherseal.	1) Lack of sealer along side rail to glass panel. 2) Lack of sealer around the rail weatherseal tab. 3) "A" or "B" butt joint leak.	1) Reseal side rail along the glass. Refer to page 9. 2) Reseal around side rail weatherseal tab. Refer to page 9. 3) Reposition roof weatherseal to rail weatherseal. Refer to page 8.
8, 9	Front header or upper roof molding leak. Water coming out of headliner at windshield.	1) Lack of sealer at the top of the t-roof frame. 2) Hole in frame from previously removed moldings. 3) Windshield leak.	1) Reseal under fornt roof molding. Refer to page 11. 2) Reseal hole in frame under front roof molding. Refer to page 11 3) Reseal windshield. Refer to GM shop manual.