Desugn flaw for the flap under the dash on driver side controling ac/heat
I read your response about the stuck ac knob and have replaced mine. Very expensive, but it's the fswtching mechanism for the flap that caused the problem because now it's just as hard to turn and fear breaking it again. You mentioned trying the PHX dealership to find out what to do. They quoted me $1,200 to pull dash and replace entire part. You mentioned in a previous reply to someone else with a similar problem something about a new design for less than $10 and removing two screws and replacing the plastic switching mechanism. What exactly do I ask for so the dealership will understand me? And does this require pulling the entire dash?
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Re: desugn flaw for the flap under the dash on driver...
Check the cable i have had the same problem with customers cars and most of the time it is due to the cable kinking if you reposition the cable before it gets a crease in it it will be fine if not try putting a new cable on very cheap and easy to do
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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.
I really can't be sure off hand, but what you wrote looks like the control valves are sticking(these flaps allow air to go different directions at the vents). its located at the heater core(towards the left side of the heater core) under the plastic just under the dash. you can manually move them, encase they are stuck, they do stick sometimes. while checking the vent doors, make sure your vacuum lines are connected. also check to make sure your vent hoses are tight. I hope this helps
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.
I have a 1500 chevy picup that did the same thing the control panel (blower, temp, and selector) is what was the problem with mine replaced that and fixed it. Very easy to chg.front of dash pops off control panel pops out 1 plug ( yours may have 2 plugs)
pop back in and your done.
i cannot tell you exactly where it is but I do know there are flaps that move as you turn the heat knob. it mixes hot and cold air to get the determined temp. if the door is stuck in the cold position though you will get no heat. all I can tell you is it will be in the middle to passenger side and you should see some sort of linkage hooking to it. note there is a direction/panel defrost etc. flap
there is a fresh air recirculate flap.
there is ahot cold flap. so what I am trying to say is if you dont get it on the first one keep trying. it could have electric actuators that move these flaps so dont necessarily look for metal rods or cables.generally you can tell if when you turn your knobs and they are very easy it is electric. but if you feel some resistance it will have cables/rods going to them. just start digging under that dash.
Either the control cable is bound up or more likely the door inside the air ducting is jammed or warped, you will have to gain access to the door to check this out, you may have to remove the dash assembly.