97 TJ Yellow HVAC Vacuum Line

wv_kid

Member
Original poster
Joined
Feb 28, 2023
Messages
90
Location
Spokane WA
My TJ HVAC works pretty well but I have more or less the same amount of air through the defrost vents and floor vents whenever I move the slider between defrost only and defrost/floor. All three actuators work, but the defrost actuator doesn't do anything when you switch between defrost only and defrost/floor - only when you switch to the dash vents.

I pulled the blue and yellow vacuum lines off of the defrost actuator and I moved the slider into every position. The blue vacuum line gets vacuum in some positions but the yellow vacuum line never gets vacuum.

I am thinking maybe i should pull the HVAC controls and see if the yellow vacuum line has vacuum at the dash control or maybe there is some kind of blockage or leak? Any better ideas?