Defroster Vents Only & Postions 1 & 2 arnt working - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 06-20-2012
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Defroster Vents Only & Postions 1 & 2 arnt working

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.

Last edited by Kris03; 06-20-2012 at 06:00 PM.
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Old 06-20-2012
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Its a vacuum leak, you just need to find it.
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Old 06-22-2012
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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.
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Old 06-22-2012
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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.
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Old 06-22-2012
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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.
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Old 06-23-2012
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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?
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