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I have a 93 4.0 with the aux heat. Looking in the Ford factory book at the 3.0 there is not much diff. There is a lot to the system, the blower,front & rear contols,duck work,heater,metal lines, rubber hoses, interior trim etc. I just put in new hoses for the front that connect into the metal aux lines. The only people that makes the heater hoses for the front is Ford. I talked to an engineer at Gates Rubber Co. and they eventually will put out the hoses but they have to design & tool up production. At a a very good discount they still were $120.00 from fordpartsonline.com. I will fabricate my own replacements for the back. Even if you found all the goodies to change over, do replace the hoses & be prepared for the price. My two cents worth. Good luck.
A cheaper alternative would be to get yourself a universal type heater, i
have one in my '93 and it works quite well, you can fing them pretty cheap from jcwhitney.com... just fyi
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.