AC Not Blowing Out Top Vents

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boloboss

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Houston Texas
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Shuntel
Truck Year
1984
Truck Model
Chevy C10
Engine Size
v8 350 5.7 liz6er
Took apart and cleaned the rubber vacuum dial on the selector switch at the rear of the climate control. All vacuum lines appear to be attached to everything behind the dash
Q: any advice
 

Bextreme04

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Oregon
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Eric
Truck Year
1980
Truck Model
K25
Engine Size
350-4bbl
Does it switch at all? If there is no vacuum going to the system, it will default to a weird split between defrost and floor. I would check and make sure the vacuum line from the engine to the accumulator is present and in good condition. Then make sure the hard line that connects underneath the accumulator is fully connected and doesn't have any cracks going into the firewall hole. I've had it come loose before and you can't tell with just a casual glance since it is underneath the tank.
 
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boloboss

Full Access Member
Joined
May 6, 2023
Posts
72
Reaction score
19
Location
Houston Texas
First Name
Shuntel
Truck Year
1984
Truck Model
Chevy C10
Engine Size
v8 350 5.7 liz6er
thx
Q; where is the accumulator
 

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