VixJeep Posted October 27, 2019 Share Posted October 27, 2019 I've looked at numerous pics and vacuum drawings, but I still haven't figured out what these are. This is on an 88 Pioneer w/air, 4.0, 5sp manual. My blower blows all the air through the defrost, so I thought these might be the vacuum lines that work that. I am referring to the black and white lines that come through the firewall just below the overflow tank and above the blower motor. Its been a great week for Jeep projects. I got my parking and blinker lights going again, got an alternator, vacuumed leaves from the blower motor, mounted the rear view mirror, got a new hood, did the headlight wiring upgrade, and fixed the broken headlight adjusters, Link to comment Share on other sites More sharing options...
eaglescout526 Posted October 27, 2019 Share Posted October 27, 2019 The white which at one point was grey controls the heater valve for the core. The black one is what controls vacuum for your vents. There should be a reservoir in the bumper and one end should lead to a broken end that needs to plug into that line. Then you'll get your vent air back. Link to comment Share on other sites More sharing options...
VixJeep Posted October 27, 2019 Author Share Posted October 27, 2019 OK. The black line connects to the broken vacuum hose. Could you be more specific as to where the white one goes? Just want to make sure I get it right. Link to comment Share on other sites More sharing options...
jdog Posted October 27, 2019 Share Posted October 27, 2019 the white one would go to a valve on the heater hoses, it looks like its been deleted, just plug the white line and it will be fine. Link to comment Share on other sites More sharing options...
VixJeep Posted October 27, 2019 Author Share Posted October 27, 2019 Thank you so much. After vacuuming a volume of leaves from the fan area, it was blowing again, but all up top. That was maybe the quickest, cheapest fix ever. But then I messed around and found the guide of everywhere in the A/C I need to take loose and replace the o-rings. I already have a new compressor, dryer, and evaporator installed, but I've never changed an o-ring so it leaks. I even found the pack of o-rings I bought to do it. Looks like I have found me a Sunday project. Link to comment Share on other sites More sharing options...
cruiser54 Posted October 28, 2019 Share Posted October 28, 2019 Link to comment Share on other sites More sharing options...
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