Re: heat won't switch back to cool 2003 turbo bettle
If you can get in there ,the little flap probably just fell down,like mine and my cousins. I cut a short piece of half-inch pipe to prop it back in place two years ago. He glued his three years ago . Both still work .I think I took the glove box out first then the panels on the sides of the front of the console to access.
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Its a electric motor in the box that has a plastic flap when u turn from cold to hot it has a flap that adjusts accordingly which is the same for where its blowing to where its set first check the flap by pulling the heater box see if the flap is stuck next electric motor and electrical heater box is a simple system I haven't pulled one out a Subaru but i have done a couple its a pretty easy system to diagnose
air control heat knob needs removing to determine if its the knob itself, this will just pull off, look at reverse of knod and look to see if the center locating pigot is worn "round" or broken , if this looks ok then the panel housing the knob controls will need removing and then check if the heat control wire is in place, if so trace this wire ,this is a bare steel control wire not an electrical the wire, to the heater box lower dash behind the control panel and see if you can manually move the heat control flap this will look like two toothed semi circular cogs that inter lock , one may have jumped out of place try a little vaseline on the cogs to help lubricate the movement,this is just good practice, after all this i think you will have found the problem.
The rod that attaches the heat controls is out of place or broken and isn't moving the flap. Could be on the control end on the dash or the other end and/or could be a vacuum line fell off in this same area behind the controls.
The heater operates from the hot water from the engine cooling system flowing through the heater radiator which is inside the air ducts under the dash. I suspect that the control wire/cable that goes from the heater control lever has broken or become disconnected from the heater tap that controls the volume of hot water through the heater radiator. Some times there is also a flap in the air ducts that is operated by the heater lever tha varies the amount of air that is heated. The tap may be in the engine bay or tucked in behind the air ducting.
There is a door attached to the cable behind the levers on the heater controls. The cable goes to the heating unit under the dash to a trap door that is supposed to move. You will want to look to see that the cable is attached and moving the lever on the side of the blower box under the dash. If its not moving, move it manually and see if you get temperature change to cool. Probably, your heater is stuck on and hot air is being carried over the heater core and into the vehicle. You need to close off the door that allows the heat into the vehicle and then trace the cable back to the lever to find out where the problem is. Maybe a broken or disconnected cable or improper closing heater box door.
the selector flap is not moving all the way to cold or hot position. Under the dashboard on the passenger side is a heat/ac box where all the duct work for the vents originates from. inside that box is the radiator for the heater and the cooling coil for the ac. the selector flap between them is stuck or not moving all the way.