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I just had an exhaust leak on my manifold fixed (broken bolt) and I was poking around under the hood and found this hose broken. Can someone tell me what this hose is for? Any info would be appreciated.. Thanks!

 

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Your heating/cooling circuit works with vacuum. That hose moves air thru it when actuated by heater switches. The air then moves the 'diaphragm' inside that little canister the hose is attached to. The diaphragm moves that metal arm coming out the other end of the 'canister', which in turn moves the gate/door inside that larger black casing.

Hope that makes sense? You can typically find a good used hose at your local wrecking yard that has wrecked out moldy Broncos and/or F150/250s in it.
 
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