MJThadUSAF Posted January 23 Share Posted January 23 So, recently went on the good ole dash-completely-out new heater core journey. Not as bad as I thought. Neighbor and I got it done in an afternoon! However, now I need to figure out how to get my blend doors working, When I adjust the temp or vent mode on the climate control panel my blend doors don’t move at all. I see those black and white vacuum hoses running from the climate control are disconnected as well. Can anybody help with this? I need some major guidance, haha. 1989 Pioneer, 4.0, 2WD, pretty sweet ride. Link to comment Share on other sites More sharing options...
eaglescout526 Posted January 23 Share Posted January 23 All the blend doors are controlled by vacuum from the engine. There should be a reservoir behind the bumper in a shape of a ball(less cruise control) or a football(with cruise control). If you have the ball, it’s just one line that goes up to a vac line that comes out of the foam where the heater core tubes come out of and connect to that. The football shape has two lines, one for cruise and one for the HVAC. If you have cruise, hopefully that line is still hooked to the servo and just leaves one line unattended. Link to comment Share on other sites More sharing options...
watchamakalit Posted January 23 Share Posted January 23 4 hours ago, eaglescout526 said: All the blend doors are controlled by vacuum from the engine. There should be a reservoir behind the bumper in a shape of a ball(less cruise control) or a football(with cruise control). If you have the ball, it’s just one line that goes up to a vac line that comes out of the foam where the heater core tubes come out of and connect to that. The football shape has two lines, one for cruise and one for the HVAC. If you have cruise, hopefully that line is still hooked to the servo and just leaves one line unattended. I thought the hot\cold door was cable actuated? Link to comment Share on other sites More sharing options...
eaglescout526 Posted January 23 Share Posted January 23 29 minutes ago, watchamakalit said: I thought the hot\cold door was cable actuated? Whoops! My bad. That is correct, the rest of the doors are vacuum actuated. Heat and AC are just the cable that actually can be seen on the pass side behind the lower dash. Link to comment Share on other sites More sharing options...
watchamakalit Posted January 23 Share Posted January 23 1 hour ago, eaglescout526 said: Whoops! My bad. That is correct, the rest of the doors are vacuum actuated. Heat and AC are just the cable that actually can be seen on the pass side behind the lower dash. Whewww. Thought I was losing it there for a minute. (not that I ever had "it" to begin with) Link to comment Share on other sites More sharing options...
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