Symptoms
Water on the floors after rain or a car wash, wind noise at speed, or rust starting under old seals.
The fix, step by step
- Remove the old rubber and scrape the channels back to clean metal and fiberglass.
- Treat any surface rust you find.
- Fit new hardtop quarter-glass seals, door-opening weatherstrip and the liftgate seal with weatherstrip adhesive, working a short section at a time.
- Refit the top and check the fit at the bedsides before you tighten the bolts fully.
- Water-test with a hose.
Tools & part numbers
- Plastic scrapers
- adhesive remover
- weatherstrip adhesive
- masking tape
- garden hose
Where to buy the parts
Hardtop quarter-glass seal, LH or RH, 69–72 Blazer/JimmyAuto Metal Direct ↗Amazon ↗
Door-opening weatherstrip pair, 69–72 Blazer/JimmyAuto Metal Direct ↗Amazon ↗
Hardtop and liftgate seals (search)Auto Metal Direct ↗
Hunting a used or discontinued part? Search eBay Motors for Chevrolet K5 Blazer (1st generation) parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.