8
901182 REV A 6/13/11, INST 81-87 CHEV P-UP wo AC EVAP KIT PG 8 OF 27
DEFROST DUCT INSTALLATION
INSTALL (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 SCREWS
AS SHOWN BELOW.
(2) DEFROST
DUCT
623219
FIGURE 3
(4) #8 x 1/2”
PH PAN HEAD
SCREWS
(4) #8 U-NUT
189801
FIGURE 4
APPLY 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.
FRESH AIR CAP AND FIREWALL MODIFICATION
SILICONE
BACK SIDE OF
FRESH AIR CAP
1/4-20 x 1”
BOLT
1/4” FLAT
WASHER
FRESH AIR
CAP
MARK
HOLE
MARK
HOLE
MARK
HOLE
MARK
HOLE
MARK
HOLES
#14 x 3/4”
SHEET METAL
SCREW
OEM
HOLE
MARK
HOLES
OEM
HOLE
1/4-20 x 3/4”
BOLT
1/4” NUT w/
STAR WASHER
1/4-20 x 3/4”
BOLT
1/4” NUT w/
STAR WASHER
