I have lots of heat on my feet, but it won't go to defrost, knob bounces back. Is it a vacuum line or a cable control? I saw a previous post that claims it a cable control that is bent, and you can straighten it out. Others, have told me it is a vacuum line. Thanks, Lynn
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These vehicles came with 2 types of ac controls.
The vacuum control system uses vacuum to actuate the vents and ducting from hot to cold. A lot of times the HVAC vacuum line in the engine bay (black hard plastic) is either broken or disconnected from its vacuum source.
The electronic vent control: does everything at the control knob via vent actuators and the control panel itself. With this one it could be any of the components. You would have to locate them and verify operation by moving temp/vent selector.
It sounds like vacuum is not getting to the vent, heat and A/C controls. Find the vacuum can. It may be under the hood on one of the inner fenders. The "one-way" check valve is usually located in the line and close to the can, make sure it works properly. The valve could be the very thing that's causing the problem. Trace the lines back to the vacuum block at the intake manifold or fire-wall, and also back to where the line goes thru the fire-wall. Check the can for leaks or obvious holes. They used to be just a plain metal can, but it could be a plastic ball. Check the lines as you go, for breaks and rub-thru's. Move the controls thru all settings and listen for vent door movement. Worst case is a bad vacuum motor or air flow position selector switch, and/or a faulty Blend Door Actuator. If you have been driving around with the Temperature knob or control set at the same spot for months, move it from fully cold to fully hot several times and wait for the air temperature to change each time. This will help reset the blend door and vacuum control system. Hope this helps... Let me know what you find.
Look for a vacuum line passenger side rear under hood near hood hinge area. Follow this line back to the intake manifold. checking for crack and leaks if any breaks in this line repair them this should fix your problem if not check all vacuum lines under the dash as well as the vacuum diaphrams that control heater door operations. if you have a hand vacuum pump you can check all these at (previous found) intake connection for the heat controls
you are sure the knob is not stripped right ....it all runs on vacuum look underneath and ensure they are all attached to the cluster on the knob as well check the vent itself and that the cable is not kinked preventing operation ..passengers side upper corner
There is a vacuum leak under the hood. Find the vacuum line on the passenger side where it comes through the firewall and follow it to the engine. You system needs vacuum to operate and without it the default setting is on defrost for safety reasons.
Hi: On the back of the heater control unit are vacuum lines, make sure
plug is firmly attached. FIRST though check if vehicle does not go into 4WD high. If not then you
probably have a vacuum problem under the hood as vacuum controls heater, 4WD and
other functions. Check to make sure vacuum lines under the hood are
all attached starting with the vacuum pod (located in front L fender by brake module.) and chasing them under the
hood. If you have vacuum then check heater control module and lastly heater door vacuum actuators. Hope this helps.
so the knob is either broken or stiff to move and plyers wont turn all the the way to throw heat or cold air out for you.
gently undo the two screws underneath your heater controls ( 2 screws)
after that pull that peice out (there are no clips so it should be easy)
after that is out you have more room to play with (getting your hand up behind the controls)
now take the peice around the heater knobs and cd player off there are a few clips on this part so be careful not to break any but if gentle should come out easy.
after thats off unscrew the cd player and unconnect the attena wire (small black wire hooked at far left of cd player) and the other radio harness.
after that remove cd player out of the way.
then you can see that your heater/ ac knob switch is controlled by a plastic arm try and push all the way to the left for heat and right for cold air. (this is one of the ways if they plyers arent working anymore)
another place to look if your not getting the right results yet is underneath near the gas a break pedal to the right its a white plastic peice with another arm system in which you can either push toward the front of the car for heat or back to driver for cold air (may have them mixed up but either or should give results)
re assembe and your good to go rather then a costly trip to the dealership if your just looking to stay warm in the winter or cool in the summer.