Find and seal water leaks

Symptoms

The fix, step by step

1. First rule out the heater core: a passenger floor that stays wet without rain is usually coolant, and the core sits behind an easy-to-remove panel under the dash.
2. On 1984–88 trucks, clear the cowl drains and seal the cowl-to-firewall seam.
3. Small holes can be sealed through the access covers, but rusted cowls mean drilling out spot welds.
4. For the A-pillar and roof seam, the rear drip rail and the area above the hatch, dig out the cracked factory seam sealer and apply new sealer (silicone is only a temporary fix).
5. Leaking side glass has to come out: remove the trim, unbolt the glass, cut the old seal with piano wire with a helper and reseal it with tar ribbon.
6. Don't force it, because the glass breaks easily and is expensive.

Tools & part numbers

• Trim tools
• seam sealer
• tar ribbon
• piano wire
• drill (for cowl repairs).

Where to buy the parts

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