Since my last wheeling trip ive had alot of issues show up all at once. i was able to fix most of them but im stumped on one.
as some of you know today was f-ing hot! so i put on the a/c and come to find out its only working through the defroster vent. this happened to me once before and it was a vacuum line that came loose. so i checked all line that i can think of and there good! and now that im thinking about it...im not even sure that positions 1 and 2 are even working properly. the a/c still kicks in but its not blowing till you turn it to 3.
any ideas on what this could be...naturally it breaks on a day that i need it most!

Little update. there is a red line that comes off the manifold and to the reservoir. i took that line bypassed everything and connected it to the black line that goes thru the firewall. no changes.

 

Its a vacuum leak, you just need to find it.

 

Does anyone know what that vac resevoir is for or what else needs it? So far i think jus a/c and vac hubs need it. I dnt have vac hubs so im thinking about bypassing it and taking the vac line for the vents and connecting it directly to vacuum line coming off manifold.

 

That happened to my old truck and I just left it and it didn't bother me. But when It happen to positions 1-4 I decided to fix it. But I brought it to a shop so I am no help.

 

is it the blower motor resistor pack that causes this? i wanted to get the name of the part so when i go into work tomorrow i can order it. blasting it all the time is just not gunna work for me lol

i did bypass the vacuum resevoir but directly connecting the vacuum hose to the intake manifold.. works nice except when you open throttle up a lil it starts to fade out and then go to defroster vents haha...guessing the lack of vacuum when the throttle is more open.

 

Sounds like you put a hole in the res wheeling.

The resistor pack is responsible for not having low or med speeds, but who uses those weak settings anyway?