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Posting Guru
Joined: Dec 2009
Posts: 2,134
Likes: 1
From: Mississippi
I think that is a vacuum reservoir. A friend of mine who was anti Ford bigtime used to joke that it was nothing but a Folger's coffee can painted black. Some years use a round plastic ball on the inner fender for this purpose.
Cargo Master
Joined: Apr 2009
Posts: 3,038
Likes: 4
From: South west Idaho
I thought it might be a vacuum reserve for air cond. controls. I tossed one in a 79 i don't have anymore and the air controls were not working right when i got rid of it. So i think back and wonder if that's what caused it.
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
Yes, they're both vacuum reservoirs.
In the vehicles I've seen, the fruit juice can is used by the engine controls, and the softball-sized black ball is only installed when air conditioning is installed (the HVAC controls use it).
Vehicles without AC have cable-operated ducting instead of vacuum motors, the reservoir keeps the ducting doors from changing positions during times of low or no engine vacuum.
In the vehicles I've seen, the fruit juice can is used by the engine controls, and the softball-sized black ball is only installed when air conditioning is installed (the HVAC controls use it).
Vehicles without AC have cable-operated ducting instead of vacuum motors, the reservoir keeps the ducting doors from changing positions during times of low or no engine vacuum.
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