Quick AC vacuum question...
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Freshman User
Joined: Sep 2006
Posts: 33
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From: Texas
Quick AC vacuum question...
I have a 1994 F150 302 5.0L. There are two ac vacuum hoses that run from inside passenger side firewall to outside motor firewall. One is white, and the other is black. I fixed the white one which cause the defrosters to work during acceleration....anyways...the black one leads to a two way check valve. On the check valve, there is another vacuum hose that leads to a black box near firewall. What is that black box and what is the purpose of that vacuum hose. Thanx a bunch!!
