Operating instructions
6 
Remove control head. Disconnect control cables, and blower switch , discard. Retain all 
of the original hardware. 
Remove the complete Heater Assembly and discard. 
Locate on the drivers side the Fresh Air Inlet Box. Locate the transition duct between the 
inlet box and the louver in the Instrument Panel. Remove transition duct only and discard.  
NOTE: Drivers side air inlet box is same as passenger. Reference picture page 3. 
NOTE: There is a template provide on page 26 of these instructions 
Looking through the glove box opening locate the 1 ¼” dia hole that the heater 
connection extended through. Also locate original hole that the heater assembly mounted 
through. Drill and cut the holes as shown below. 
NOTE: INSTALL (2) 1 ¼” CAP PLUG OVER ORIGINAL HEATER CONNECTION HOLES. 
Caution: on the engine side of 
firewall there is a brake line. Do 
not drill through. It may be 
necessary to carefully relocate 
this line. 
1 ¼” original heater 
connection hole. 
Original hole 
5/8” dia. Hole 
Drill 5/16” dia. 
4” dia. Hole. 
5/8” Dia. hole. 
Brake line 










