HVAC air only blowing through defrost vents
- Thread starter Chris
- Start date
Sabotage commited by operatives from a Lesbaru forum.
I am looking at all my vacuum lines now, so far I can't find the leaking culprit! But I will continue to look. They say patience is a virtue, but dang vacuum leaks sure do try mine!!!!!!!!
Alski
TJ Enthusiast
Right on. Let me know how it goes. I still remember the cold air pumping out properly on low when it was diagnosed lol!! Message me for ANY questions cuz I looked at everything from disconnected lines to the actuator to switches to even melted wires. If you haven’t found anything- your destiny lies beneath the wall lol.
I think I may have found my issue and it wasn't hard at all:
Not sure how this happened, but clearly it melted.
It was melted to the hood to tub ground strap of all places (you can see the mark on the ground strap where it was melted to). Does that strap get hot or something?
I need to splice in a piece of rubber tomorrow and see if that solves my vent issue. I'm guessing it will.
Not sure how this happened, but clearly it melted.
It was melted to the hood to tub ground strap of all places (you can see the mark on the ground strap where it was melted to). Does that strap get hot or something?
I need to splice in a piece of rubber tomorrow and see if that solves my vent issue. I'm guessing it will.
Yes, that burn mark appears to be where the vacuum line melted to the ground strap. Not sure how on earth that would happen. I mean it is 115 here, so maybe that has something to do with it.
If it melts that vacuum line, I'd isolate it from that wiring harness to protect it also. I'll have to check mine to see if the ground strap is touching anything like yours.
Thats what I am going to do, find a way to isolate that ground strap. I would hate for that to happen to the main wiring harness.
Steve Rodgers
TJ Enthusiast
Plastic ones? Not entire sure, but I'd just as soon replace it with rubber. I like the idea of rubber better than plastic anyways.
I can't think of any reason that ground strap should get that hot. The only electrical device that could possibly ground through the hood is the underhood service light, so unless something has gone way wrong that ground strap should be somewhere between the underhood air temp and the temp of the hood itself. I'd start poking around with an IR gun to see where all the heat is coming from.
I wonder if it had anything to do with the Arizona heat. I mean it's 110 here almost daily, so it does make me thing. Either way, I'm going to wrap the line in something just to be safe from now on.
If anyone is interested you can buy the entire under hood HVAC vacuum harness. Comes with the tee, check valve and elbows. I’ve seen them for less than $20.
https://rover.ebay.com/rover/1/711-...0001&campid=5337789113&icep_item=192540938254
https://rover.ebay.com/rover/1/711-...0001&campid=5337789113&icep_item=192540938254
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@Chris as well, is it normal to feel air blowing out exactly where Rich’s picture was taken? I’m trying to find this vacuum leak and it is not fun :/
UPDATE:
I think I found my culprit… that little green end
Well that was a problem but it wasn’t thee problem :/
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Update: Woke up this morning and everything was working! During my nice, heated drive this morning to work it dawned on me. Your TJ needs to be running to diagnose vacuum issues… LOL
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