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Re: no air from dash vents
They are vac. controled. The leak could be behind the controls, but first check under the hood usually near the fire wall and check for any cracked or broken vac. lines and repair as necc. this should solve your problem. The vac. lines under the hood go bad first due to engine heat. If you have a length of line to replace make sure you use vac. line so it wont collapse. Soft softs in vac. lines is another sign of a bad line replace these also.
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There is a procedure for this condition. GM says to flush the core with a cleaning agent they sale. I have found Lysol Fresh scent does a much better job of curing the condition.Spray the Lysol in the outside air intake vent while the vehicle is running with it set to max a/c and fan speed also on max. It will take about 1/4th can to fully clear the mildew smell and stop it from growth. When parking the vehicle always put it in max a/c position so the fresh air outside the vehicle will dry out the coil.
I noted your question. You said that NOTHING is coming out of the VENT. Do you mean the interior vents normally for heat and air? Does air blow out of your dash defrost vent? Does blower motor work continuously? If so, I suggest that you check fuse panel at driver's door. If you have your owner's guide, look on pages 251 and 252. 251 shows your interior fuses. 252 shows description for Fuse #9 (10A). You have numerous 10A fuses. #9 is the lowest fuse perpendicular to Fuse #10 (15A). If it is blown, you have some sort of resistance in one of 4 things RUN BY THE FUSE. I went to my mechanic and he told me that the Blower Motor Control Resistor behind the glove compartment was bad. I replaced it (125 dollars) and it was not the problem. Check the fuse. Is it blown? Replace and the system may work normally. If it continues to blow please get back to me. If the system works after replacement, please respond.
Sounds to me the blower motor is on it's way out and should be replaced. Even though they sound like there working doesn't mean everything is ok with it there are different parts on it that could go wrong and they way to fix it is with another blower fan and not a bad idea to do the resistor at the same time located in the blower box with about 4 wires coming out of it with one or two screws holding it in place all is located under dash behind the glove box area.
It sounds like you have two problems. First a question though; Is your heating and air conditioning control on the dash automatic (has two knobs that rotate and a display screen in the middle), or manual (has two levers that move up and down for driver/passenger temp and a separate fan knob and mode knob).
In response to the vents being stuck on defrost and floor, from experience i can say that the most likely cause is the mode actuator has failed. If your battery has recently gone dead, that could have brought the problem to the surface. When the battery has gone dead, the heating and air conditioning controls relearn all the positions of the actuators behind the dash when the vehicle has been re-started. If there is a position sensor failing (which happens quite often) in one of the actuators, the heating and air conditioning controls won't be able to learn the correct position of the actuator and (in your case) defaults to the defrost/floor position.
The only way to fix that would be to replace the actuator. I would like to know what type of heating and air conditioning controls you have (manual or automatic) before i say anything on the blower only working on 5.
Does the heater blow cold air from the vents or do you mean the there is no airflow from the vents? cold air from the dash vents when the heater control valve is set fully hot could be an air pocket in the cooling system. The radiator sits slightly lower than the engine causing air pockets to get trapped in the engine when you replace the coolant. you'll have to purge the cooling system to restore flow to the heater core. No airflow (blower motor inop) this could be a bad blower motor transistor. pin test the blower motor circuit.
this is the probleme with luxury cars ...the venting systheme works with vacum and some thime smal electris motor ...if one is broken or a hose craked ...this kind of stuff appens not much to do but to take the under dash apart and look for the problem, it could also just need a little lubrification on all the moving parts !
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.
Check the plenum door motors (vacuum controllers). When you move control you should see each of them move. the one that does not respond is the one that isn't working. Check hose that feeds it as well if no vacuum there switch control is bad.)