What's new
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

Vent fan always running...

82OilBurnr

82OilBurnr

Registered Member
 Premium
Joined
Apr 9, 2019
Posts
24
Reaction score
10
Location
SoCal
Hey everyone. I’ve searched until I’m blue in the face and can’t find help on this topic. My ‘82 Jimmy is equipped with A/C (although it’s not working currently). One major issue: my fan is always running. The switch is in the “off” position and the fan still runs. I also don’t think that switching it between floor/vent/etc is working but I’ve read that is probably the blend door. I have the dash apart so I can clean all of the ducting and re-fit vent gaskets. I see the linkage for the hot/cold is a physical linkage and looks to work just fine. The vent mode selector goes into a wired harness and maybe that’s where my problem is? Would buying a new A/C control fix this? Ideas? I figured I need to get this sorted before worrying about the A/C.
 
I believe that is normal on non A/C equipped square bodies--GM introduced a "flo thru ventilation" feature sometime in the 70's on square bodies ,that consisted of the blower running at low speed (even in the "off' position),and the louvers made into the door bottoms and the part of the door facing the jamb area..

I hated the blower constantly running in my pickup,as it would emit a horrifying screech once in a while on frosty mornings ,so found which wire on the plug that goes on the resistor (under the hood at the blower motor) that powered the low speed setting and removed it from the plug..taped it to the other wires..

On an A/C equipped truck I believe the fan switch only has "low-medium-high" settings--to kill the power to the fan completely you have to move the upper slider lever to the "off" position..then it should stop running ..
 
I am wondering if there is an internal problem in the switch.
But I have to ask, are you checking this while the truck is stopped? I ask because it will move air through while driving, which can seem like the fan is going. If this isn't the case, I would try to verify if the switch is actually killing the power. And from what I remember, it's the one on top of the control panel that turns things on/off. The vertical blower speed selector just changes the speed of the fan.
 
My fan also runs on low anytime the key is on. Even if it is OFF at the AC controls, the fan runs low.

Previous owner disconnected a wire under the hood, which I believe stopped the blower altogether.... Anyways I reconnected it , and I assume that the blower always on is normal
 
Update: upon further inspection, the metal arm that goes into the vacuum selector module was bent, not allowing the module to click into the off position while the switch was in the off position. It also was preventing the switch from going into defrost mode. I bent it back up but will likely buy a new switch mechanism as the face of mine is pretty beat up. By manually clicking the vacuum selector into the OFF position, the fan does not run at all, which is what I was hoping for :)
 
You must log in or register to reply here.

Latest Posts

Top Bottom