i pick up this '98 couple weeks ago. the heater only blow on the windshield and no where else no matter what mode i switch to. i check the blend vent cable and it working properly. i found this vacuum line on the T fitting is broken off. this might be the problem why the heater only blow on the windshield. can somebody high lite or circle where the broken line suppose to connect two?

 

I think the heater core control valve is missing?.

 

That should be connecting to the vacuum reservoir, which is a black plastic ball behind the front bumper (if it's stock). It's kind of a goofy location, and some people think it's okay to remove it. That's what causes your vents to only blow on defrost, since it is vacuum-controlled.

 

[double post wtf]

 

Yes. All 97+ have a missing heater control valve from the factory

 

Good to know. I'm only familiar with my 91 and older. Either way he or she should cap off both lines.

 

the vacuum ball line is fine actually one of the line (left side) connect to the ball, the line that is broken off is very smaller line

 

What?

 

i was just trying to say was the line to the vacuum ball is there and this other broken line must go some where else cuz it looks line the po broked it off. i don't think it been capped off before. tomorrow i'll cap it off and see if the heater blow else where. maybe i'll hit the jy this weekend and see where the line actually connect to.

 

Yeah the vacuum line running to the ball is bigger than the line that is not connected. This is what I got on my 91. In the first picture you can see the gray line is plugged with a bolt. Did this on purpose. In the second picture the black line is connected to the vacuum ball harness. In the third picture you can see the size of the line connected to the vacuum ball. Get out your FSM and trace the vacuum lines and reconnect/figure out why they were cut. If somebody modified them they did it out of stupidity of there was a "band aid" reason and what not.

 

Good call for using the jy for getting to know your factory setup. I do it all the time.

 

so you saying the grey line on yours that is plug up with a bolt, lol would be the same small line that is broked on mine and if i plug it i would probably get heat blow out different area of the vents?

 

I'll check out how mine's set up tomorrow. Also a 98. Maybe cruise control...?

 

Grammar please. Very possible. Try it.

 

i don't think so i didn't see any broken line on cruise control