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My brother in law is a mechanic and he gave me a piece of good advice that I thought I should pass along. In the engine compartment on the passengers side against the cab is the blower motor and housing. He said he has seen numerous Ford trucks where leaves and other debris gets caught up in there and have caught on fire. Sure enough, I took mine apart today and it was very dirty. Also, once the motor is out, there is a recess that goes down and towards the truck. Lots of leaves down there also. So, I took out the shop vac and gave it a good cleaning. Every one should check this periodically and clean it. Real easy to do, 4 screws and 2 wires connectors. Might save your truck one day!
I watched a friend once cleaned what looked like a a mouse nest. I couldn't believe all the stuff that was in there. He wasn't gwetting heat so we decided to take out the fan motor. A great tip.
I had dark, thick smoke come out of the heating vents when i first turned on the defrosters for the season. LUCKILY it stopped about 6 seconds later. We jumped out of the truck and I was ripping anything out I could as I thought the truck was on fire until the smoke cleared. I think the moist air (sleeting/raining at the time) and the moisture in the compartment is what saved me. I still have yet to take the blower compartment off on my 86' F350, I don't even know where to start on it, my past truck had AC, this one doesn't.
Just pull the blower motor out. Its on the pass side.
Like nmarlowe said just remove the 4 screws that hold the blower motor in the heater plemnum and its all yours. Heck I don't even unplug the wires. I just lay the motor aside.
Funny this came up. I just cleaned mine out on my 82 yesterday evening. I had "that fire" about 4 years ago. The truck cab smelled like burnt leaves for weeks. Its funny now, but it wasn't when it happened. The truck cab filled with smoke very quickly while driving at highway speed. Now this is regular fall maintenance.
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