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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.
the blower motor resistor is in the blower motor housing under the dash behind the glove box. It usually looks like a flat plastic piece with 2 screws and wires coming out if it. It isn't that obvious sometimes so look carefully and know that it is inserted into the part that goes to your vents from the blower. Replace that when you find it and you will fix your problem. auto parts stores carry these...
It sounds like you have a vacuum leak. When there is no vacuum present to acutate the system, it will default to air only coming from the defrost vents. Is the blower motor operating or is the 'no air' you're talking about just no air blowing? If it's not blowing, check your fuse; if that's good, check for voltage at the blower connection. If you have voltage at the connection, remove the resistor to make sure it isn't bad befor condemning the blower motor.
i believe this is a vacuum operated system. if there is a problem with the vacuum supply to the control unit, it will automatically default to defrost. i would start by checking the vacuum source lines. good luck!
Check fuse for blower motor, it is a 30amp fuse behind the plastic panel that is to the left of steering wheel, you must open the driver door, open up the fuse panel, I believe the 30amp is the only 30amp fuse in there, If it is blown replace it, then try the heat again. If nothing or fuse blows again, check the blower motor resistor. This is located under the glove compartment. Do a search on google if that is the case, I was able tofind a solution by putting in "blower motor resistor" ended up buying one for @ 30$.
No heat or no air volume? No heat may mean no coolant! check it now! Your 4.2 wont stand for being overheated. No volume, check the fuse, if ok then turn on you fan and check for voltage at the electrical connector at the blower motor (under the glovebox). If you dont have a test light, tap the blower motor . If that kicks it to life you need a blower motor.