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welcome to AF!
...and I wish I was back in Colorado right now...
currently working on an experimental engine; in Houston, AARRGGHH, the humidity!
anyway, the heater doors are vac operated by a switch behind the dash, kind of near radio and glove box (above evap) area.
it could be the switch losing vacuum, or a hardened line leaking or cracked. I will check my service manual when I return to my shop in a couple of hours (came home to eat)
as to your brakes; go to AutoZone (even though I do not like some of their components, or most of their customer service protocol) and get the Carbon Metallic/Fiber (I think your's will be part#0154 or 1154 something like that) for about $40-50.
if they stop an Indy Car @212mph, they'll stop your truck.
personal attestment: in Colorado Springs, on Cimarron(US24), a 3/4ton Dodge Magnum decided to fly into the turn lane behind me at 40+.
I rammed both feet on the brake, pushed down with feet and pulled like hell on the steering wheel, and told my daughter (in pass. seat) to sit fully back in her seat, all while watching this moron in my rear view careen(sp?) into my rear end... I was 2-4 ft. behind the car in front at the light. I never touched his front bumper.
$1000. damage to my rear end, and I drove away... Dodge plastic wannabe tank had to be towed as whole front end gone, radiator in two, wheel and idler bent, both headlights laying 20 ft in front of MY truck when they sailed past my mirrors.
I was disappointed my truck was banged, but I was loving it when the el paso cty sheriff was writing it up going, "Your little truck did THAT to HIS?!?!" It was worth it. bought one new tail light, threw a chain around a tree, yanked the bumper semi-straight (to at least hook-up a trailer), and kept the change.
rear shoes: 186+K still OEM from factory.
...back to you: if you want a vacuum schematic, I can scan it and email you (or fax) in a day; let me know.
good luck,
chris
nrt racing
713.933.5773 (7A-10P central)
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