HVAC Vacuum Line - Supposed To Go Here???

**zbban1** · 07-18-2015

1997 GTP, manual temp. controls. The problem is that 99% of the time when I have the a/c on, it blows out the defroster vents along with the dash and floor vents. It will also fog up the windshield on the outside after a few minutes of being on max, which is annoying, but I can still see out of the windshield. I have been looking at a lot of threads for vacuum line diagrams and have learned that a line comes off the top of the supercharger, runs along the firewall then goes down below battery tray, around the front of the car and plugs into that "vacuum ball" behind the driver's side fog light.

My thing is this...I do have a hard plastic vacuum hose coming off the s/c, but it "dead-ends" near the fuse relay center and is plugged off with a screw in the end of the line, it doesn't go all the way to the ball. After looking around and working backwards from the ball, I've traced the line to a T next to the windshield washer fluid bottle. The line from the ball ends there and one end of the T with the hard line going to a big wire harness under the fuse relay center (I'm assuming THAT goes to the inside of the car, to that round vacuum diaphragm under the dash...?) and the other end of the T goes to a larger diameter (more flexible rubber) hose that connects to the top of the washer motor itself. This does NOT seem correct!

Pics will come in my next post as I can insert them into the quick reply box, but not here in the main box...ah, well...lol.

**zbban1** · 07-18-2015

**Scottydoggs** · 07-18-2015

that line where its capped off is supposed to have a T or just turn down to the wire harness and then go into the car. that line being capped is your air flow issue for sure.

you need to find the hard line in that harness and get some new rubber vac line and connect the two lines with it.

**Scottydoggs** · 07-18-2015

this pic is the line that runs to the harness. i cant see the top end of it, but connect that line to the line off the top of the sc.

**zbban1** · 07-18-2015

Yea, I was going to post that pic, too...lol.

Ahhh, ok. But then where does the line connected to the ball go to? Isn't that supposed to get connected to the same line that goes from the s/c to that main wire harness?

Also, what is that bigger hose doing with a vacuum line attached to it going to the top of the washer bottle??? This whole mess stumps me!

**Scottydoggs** · 07-18-2015

if you have a vac ball its in the driver side front fender, take the head light out and you can see it, if you have one.

some cars have that ball, a lot of em dont. i have the ball and have a t under the fuse box, i see no t on your set up there.

maybe your looking at the wiper fluid line? not sure. but if you connect them two lines your air flow will work right again.

**zbban1** · 07-18-2015

I do have a ball, mentioned in my first post. The hard vacuum line comes off that ball (behind fog light on driver's side) and goes around front of the car and dead-ends into a T right next to the washer bottle. The T consists of a rubber hose that is connected to the top of the washer bottle (not my mess, I assure you) then goes into hard line going into the wire harness and going hard line to the ball.

If the rubber hose that's hooked up with the hard vacuum lines isn't supposed to be hooked up with them, where the devil does it go and what has it got to do with the washer bottle attachment at the top of the washer pump???

And no, the wiper fluid line comes off the bottom of the washer pump and is a totally different line (smooth rubber) and goes toward the windshield where it's supposed to go.

Please refer to 2nd pic for clarification of lines......

And if I'm understanding right, the hard vacuum line coming from the s/c AND the hard line coming from the ball both need to be hooked up together and connect with the hard line going into the wire harness? That would make sense that all the vacuum lines are running together.

But now comes the $64K question...what to do with that rubber hose that, in the 3rd pic, is resting right against the fuse box? When I unhook it from the hard vacuum lines, do I just put it back on the top of the washer pump? And if so, what has it got to do with the washer pump? Does it need to be hooked into something else?

**Scottydoggs** · 07-18-2015

i cant for the life of me find my pic of the damn T under the fuse box in my car. its in there somewhere lol

take that hard line from the rad support and T it to the line off the top of the sc, and that line thats headed to the harness under the fuse box. that simple really.

if you have a advance auto near by they sell the best little white T's your ever gonna find, you get 2 of em for 2 bucks. use a t and some vac line cut into 1 inch chunks to tie em together.

**Scottydoggs** · 07-18-2015

found it.

**Scottydoggs** · 07-18-2015

pic of the t's i used on my vac lines when i tossed the stock crap.

**zbban1** · 07-18-2015

Okay, I understand that the hard line coming from the ball and the hard line coming from the s/c both should be tied into the hard line going into the wire harness that heads into the car interior, right? If I am correct then that's the easy part...lol. I've got a couple of pics, bear with me while I get them in here...

In the meantime, referring to the washer bottle pump...on top there is an electrical connector that plugs in on top and also a nipple that something plugs onto. That's where that bigger rubber hose was attached to. If I take that hose off from being hooked onto the vacuum lines, what should I do with it? I guess what I'm asking is this...what hooks onto to top of the washer bottle pump besides the electrical connector?

**Scottydoggs** · 07-18-2015

you got!! that easy

**zbban1** · 07-18-2015

**zbban1** · 07-18-2015

Okay, I thought I got that! lol

Referring to the top pic where the 2 yellow circles are...that bigger hose was attached to the top of the washer pump (2nd yellow circle) for some unknown reason. I took the plugged end of the hard vacuum line off and just slipped it into the hose and will fix it right with a proper T. That's how it's supposed to be and I know it's not the right sized line, but will fix it up right after I go to the parts store later today or tomorrow. Thank you very much for making that less of a headache for me than I was making it...lol.

NOW, what goes on top of the washer pump, seeing that I'm taking off that big hose??

I guess that 2nd pic wasn't really necessary, just showing the T that I do have...

**Scottydoggs** · 07-18-2015

that fat hose dont go to the vac lines, its not air tight at all.

that other port and plug is your washer fluid pump i think. theres another line from the tank that runs up and under the pass side cowl.

i bet your washer fluid dont work right?

get some new vac line and make that t'ed connection tight or you will have a vac leak and the car will run poorly. and the ac still wont blow right lol.

**Scottydoggs** · 07-18-2015

and look around for the plug that goes to the pump there. its laying there somewhere close by.

**Scottydoggs** · 07-18-2015

you may have to zoom in, but you can see the fatter line lead to the cowl in my bay here.

**zbban1** · 07-18-2015

Ok, I might not have made it clear...sorry. Yes, I know not to put that fat hose onto the hard vacuum lines, will get new hose and T's when I go to the parts store. I was just trying to show that I knew which hard lines went where...guess I failed at that. lol

I unhooked the electrical connection from the top of the washer pump so I could get a better close-up pic. I have the connection, it's just unhooked. I also have no problems with the washers spraying washer fluid correctly, so maybe with that fat hose previously being hooked up to the top nipple on the pump it was doing nothing? Maybe that nipple on top of the pump does nothing?

Yes, I see your fluid line, mine is just pushed out of the way for the sake of hopefully clearer pics, but it comes off from the BOTTOM of the pump. Do you have a pic of the TOP of your pump, by any chance?

**Scottydoggs** · 07-18-2015

got ya good old mock up. new lines and id add a new T for the hell of it.

mines a regal, its not the same. my pump is on the bottom of the tank not the top.

if you dont see a hard line going under the cowl on the pass side, lift the cowl and look for it. theres got to be some of it under there. hook what you find to the pump hose.

**zbban1** · 07-18-2015

I was looking at a youtube video for replacing the washer pump on a 2002 GP and found that the pump on his goes on from inside the fender liner and that the pump itself slides into the side of the reservoir and that nipple that I'm referring to slides up into the tank itself, so may have nothing to do with my setup. maybe I can just leave it uncapped on top? I'm going out to my car right now, hit the wipers/washer and see if does anything crazy like spray out the top of the pump.....brb.

My hard line goes to the cowl, but it isn't hard till it GETS to the cowl. You can see the smaller rubber line in the pic with the s/c, going towards the strut mount, wayyyyy up at the beginning of this thread.