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905644 REV A 01/10/19, PG 9 OF 33
Photo 1
Photo 2
Photo 3
Enlarge (6) Holes to 19/64”
Use This Hole for Reference
Mark & Drill
5/8” Hole
Defrost Duct & Fresh Air Cover Installation
Locate the (2) defrost assemblies (See Photo 1, below)
Install the defrost ducts under the dash (See Figure 1, below). Align each defrost duct with the defrost
opening in the dash, and hold it in place. Using the bracket as a template, drill a 7/64” hole for each duct as
shown below. Secure each defrost duct using a #10 x 1/2” sheet metal screw (See Figure 1, below).
If the vehicle is equipped with astro ventilation, apply a 1/4” bead of silicone to the mating surface, and install
the driver and passenger side fresh air covers, using OEM hardware to secure (See Figure 1, below).
1.
2.
3.
Figure 1
Silicone
Photo 1
Mating Surface of
Fresh Air Cover
Driver Side Defrost Duct
Passenger Side Defrost Duct
Driver Side
Fresh Air Cover
640711
Passenger Side
Fresh Air Cover
640712
(2) #10 x 1/2”
Sheet Metal Screws
Firewall Modification
1.
2.
3.
Flatten the edges of the firewall opening (See Photo 1, below).
Enlarge (6) holes on the firewall to 19/64” as shown in Photo 2, below.
From inside the passenger compartment, directly below the lowest OEM hole under the firewall opening, mark
and drill a 5/8” hole for the drain hose (See Photo 3, below).
NOTE: To ensure a tight fit, do not enlarge
the hole to more than 5/8”.
NOTE: Firewall modification is required for firewall cover and drain hose installation.
Flatten
Firewall
Opening
Edges
Summary of Contents for 564191
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