1981-87 CHEV PICK-UP - Vintage Air

DEFROST DUCT INSTALLATIONINSTALL (4) #8 U-NUTS IN OEM DEFROST DUCT OPENINGS AS SHOWN BELOW IN FIGURE 3.INSTALL DRIVER AND PASSENGER SIDE DEFROST DUCTS USING (4) #8 x 1/2” PH PAN HEAD SCREWSAS SHOWN BELOW. (2) DEFROSTDUCT623219(4) #8 x 1/2”PH PAN HEADSCREWS(4) #8 U-NUT189801FIGURE 3FRESH AIR CAP AND FIREWALL MODIFICATIONAPPLY A 1/4” BEAD OF SILICONE AROUND THE BACK SIDE OF THE FRESH AIR CAP AS SHOWN IN FIGURE 4,BELOW.ATTACH FRESH AIR CAP TO FIREWALL USING A 1/4-20 x 1” BOLT AND WASHER, SEE FIGURE 4 BELOW.PLACE FIREWALL COVER ON FIREWALL AND SCURE USING #14 x 3/4“ SHEET METAL SCREW AND(2) 1/4-20 x 3/4” HEX BOLT w/ 1/4” NUT w/ STAR WASHER AS SHOWN BELOW.USING FIREWALL COVER AS TEMPLATE, MARK THE HOLES ON FIREWALL AS SHOWN BELOW.REMOVE FIREWALL COVER.SILICONEBACK SIDE OFFRESH AIR CAP1/4-20 x 1”BOLT1/4” FLATWASHERFRESH AIRCAPFIGURE 4MARKHOLEMARKHOLEMARKHOLES1/4-20 x 3/4”BOLT1/4-20 x 3/4”BOLT 1/4” NUT w/STAR WASHEROEMHOLEMARKHOLES1/4” NUT w/STAR WASHERMARKHOLE#14 x 3/4”SHEET METALSCREWMARKHOLEOEMHOLE901182 REV A 6/13/11, INST 81-87 CHEV P-UP wo AC EVAP KIT PG 8 OF 278