I now own a 97 TJ. I purchased it recently and love to fix all of the little issues before they become large problems. My question involves my heater controls, I searched the forum but didn't find this issue. When I turn on the defrost it seems to blow ok on low but as soon as I turn up the fan speed a door slams shut and won't let air come out anywhere. I can turn it back on low and repeat overtime. I have checked vacuum lines and they seem to be all hooked up.
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HVAC box acting strange
- Thread starter Jim kirk
- Start date
Maybe unbolt the fan... it's behind the battery...and see if you can see something.
-Mac
-Mac
Eventually, yes. It basically splits after the fan into two chambers...one with the heater core, the other with the evaporator.
Look in the resources section. Download the FSM. There's a diagram of the HVAC box.
My guess is you're eventually going to have to pull the dash to remove the HVAC box to completely open it to fix the issue.
But if you pull the fan you might, just might be able to see something.
Or pull the cowl and look down through the hole on the passenger side.
-Mac
You may have a snapped arm controlling one of the doors inside the hvac. The arms are moved by the three vacuum solenoids on the drivers side under the dash. You need to be something of a contortionist to be able to actually see them. Even more so if you want to get an arm up there to have a wiggle and see if Ny if the arms are loose
It sounds like the defrost flap is possibly loose from the actuator. When you turn up the fan speed, it is blowing it closed.
Bleepin Jeep has a good video that shows how the blower, flaps and actuators work. It helped me trace down an actuator issue.
Bleepin Jeep AC Box
Bleepin Jeep has a good video that shows how the blower, flaps and actuators work. It helped me trace down an actuator issue.
Bleepin Jeep AC Box
So I had a chance to dig deeper into the heater issue and found a blend door actuator arm had broken. Ordered a new one and will keep you posted. Apparently they say it's a very common issue
I finally got the broken arm out , was not easy but the new arm went in super easy and works great. Thank you. Also gave me a chance to change oil , check fluids and get it ready for winter.
I downloaded the blow up of the hvac box from the resource section and replaced the heater blend door actuator, part number 17910.01 and got it replaced. Works great now. Thanks Mac
Sorry for some short questions and answers but it seems like every couple of minutes my phone is doing another virus scan and have to start over.
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