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I have been having actually the "defrost only" or "No air flow through my vents" / "Intermittent AC" problem and also have been researching everywhere for a solution. A lot of write-ups have pointed come the problem and alluded to the solution however the question which like most persons I have actually been questioning is exactly how do I fix it. Therefore I just fixed the concern on mine 2000 Safari and I assumed I would document the solution.Tools Needed: - stubby (2 inch) level head screw driver or socket/ratchet handle- a friend v a small hand- bright enough work light- 2 beers if you room alone, and 2 for each friend who decides come help. (You will need these).Parts NeededGM component Number - 15967970I purchase the part for CDN $10.90 in Edmonton, AlbertaHere is a photo of the part
Here is the GM Tear under for this part. The one you room interested in is #12 .
Step 1 - identify that this is your trouble part.Find the vacuum and trace it. If its no obviously broken, map it to the end and also look because that cracks top top it. It operation from behind the the silver- AC tank and also on the appropriate of the heater main point on the passenger side under the hood. Mine looked fine at first, however as ns traced mine hand over, about fifty percent way under it simply disintegrated. Click on any kind of of the adhering to thumbnails because that a much more detailed pic.
Step 2 - Remove necessary parts in the pathIf girlfriend have determined that this part is bad, removed the waiting cleaner box and also the hose going come the intake manifold. There is a metal piece come which the input rubber water tap connects, you deserve to move that too. It will provide you around 1 additional inch of occupational room (every inch counts! to trust me). I didnt relocate this metal but in retrospect it prolly would have actually saved me 20 minutes or so.
Step 3 - eliminate the old link from the earlier of the engineThis part can be tough, and also if you have actually long thin arms, or if you have a friend with this tenet, climate you space in fortune! This finish is top top a tiny valve on the back of the engine around even with the gas pedal on the driver"s side. In instance your present vacuum line damaged off and also you space not certain where to look, simply take a an excellent look in ~ what the finish should look like as every the first pic in this post, climate look at the pic listed below for the routing. In a dark skinny hole (hence the need for the bright worklight) ~ above the back of the engine you will certainly see 2 valves.. One points up and also just above that is another which points frontwards and slightly left . The latter is the one girlfriend want. Friend will most likely only it is in able usage your index and also middle finger. Pull tough on the connector and it will certainly come off. As soon as you acquire it off, have a beer top top me!
Step 4 - putting it ago together againBe strong advised... Start by connecting one finish of the brand-new vacuum hose to the connector described in action 3 . You want the upper side free because if you have actually arms prefer mine, climate you wont have the ability to see in the dungeon effectively as her hand will be in the way. So ar one end of the vacuum hose between your index and also middle fingers on the ideal hand, take it a an excellent look at whereby the connecting valve in, then skinny forward and try to reconnect it. This is the hardest part.. Yet dont give up. You may also be tempted to walk pull the doghouse.. This will not help! once it snaps on, pressure it on, eliminate your hand and verify. If its not on completely, go ahead and also force it on. As soon as its every done, have actually the 2nd beer ~ above me. So as soon as this end is appropriately connected, I suggest routing the various other end over the radiator hose, and above the intake manifold, and also then come the T-connector in ~ the top. Climate reassemble your intake manifold and also air cleaner box.
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Without taking off the doghouse cover, project have to take around 30 - 45 minutes.Now, go gain the whiff of waiting from her vents as if your truck to be still new.