SurplusFan98
NAXJA Forum User
- Location
- LA
Hi all
I have the classic "air only blows from the defrost" issue, but none of the common things seem to be the issue. Fan blows strong, AC works and blows cold, but only from the defrost vent.
I have eliminated ALL vacuum leaks under the hood. Confirmed with a vacuum gauge that my leak is definitely coming from inside the cabin. Main lines pull 20psi and hold it in the canister when pinched, but steadily lose vacuum when the little line into the firewall is in circuit.
I went in the cab and pulled a vacuum on ALL the lines in the vacuum connection point behind glove box. Everything holds vacuum, and when I put the gauge on the black line at that point, its the same 20psi as under the hood. I then made a little jumper vacuum line and went from the black source line to each of the other lines, and I could sort of hear most of those working (couldn't see them because I was by myself and thats a 2 man job).
I'm pretty confident that I have isolated the vent selector switch. But, I don't know how to test it, and I don't know where to get one if I found that it was bad (looks like used on ebay is all thats left). Is there a way to test and/or fix this component?
I have the classic "air only blows from the defrost" issue, but none of the common things seem to be the issue. Fan blows strong, AC works and blows cold, but only from the defrost vent.
I have eliminated ALL vacuum leaks under the hood. Confirmed with a vacuum gauge that my leak is definitely coming from inside the cabin. Main lines pull 20psi and hold it in the canister when pinched, but steadily lose vacuum when the little line into the firewall is in circuit.
I went in the cab and pulled a vacuum on ALL the lines in the vacuum connection point behind glove box. Everything holds vacuum, and when I put the gauge on the black line at that point, its the same 20psi as under the hood. I then made a little jumper vacuum line and went from the black source line to each of the other lines, and I could sort of hear most of those working (couldn't see them because I was by myself and thats a 2 man job).
I'm pretty confident that I have isolated the vent selector switch. But, I don't know how to test it, and I don't know where to get one if I found that it was bad (looks like used on ebay is all thats left). Is there a way to test and/or fix this component?