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Re: heater blower does not come out vents
Check your vacuum lines under the hood and particularly the vacuum reservoir which is a canister that supplies a reserve on vacuum to bridge the times the engine is pulling hard.
These often have plastic nipples with pushed-on hoses that can snap off.
The directional control of air flow is most often accomplished with vacuum 'motors' that move vanes to change direction.
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not sure on model but it sounds like the selector wires have come off these are the wires conected to the blower selecting where the heat comes out from eg to vents foot well or windscreen or the little loops that the go around have snaped or come off hope this helps
the blower motor is under the hood on the pass side. u have to remove the wiper and radiator bottles and also the head light. than take out the 7 bolts that hold the blower motor in than u have to remove the squirel cage before the motor will come out. or it could be the Blower Motor Resistor.
If there is no vacuum to the mode door control motor theheater/A/C system will default to "Defrost" If there is no air coming out the vents or floor - check to see if you have air blowing out the defrost vents. If there is air coming out the defrost, then the most likely cause of your problem is a broken or disconnected vacuum line that feeds the mode control switch. On your vehicle, the vacuum supply line connects to the brake booster hose under the hood. there is a check-valve on the line between the firewall and the brake booster that can fail and leak vacuum. if there is no problem with the vacuum supply line under the hood, then the most likely cause is a bad mode control switch. (switch leaking vacuum)
If there is no air coming out the defrost vents, but you can hear the blower motor running, there is most likely a resriction of airflow etween the blower motor and the air outlet plenum. I have seen A/C evaporators completely cloggedup that will not pass any air. I have also seen paers and napkins that have gotten sucked out of the glovebox area and into the "Recirc" air inlet. Another thing I have seen several times is nests made by mice or other small rodents in the blower motor housing.
for the defroster only problem, check your vacuum lines. There are even lines under the dash. The switch the controls all that is run on a vacuum. It sounds like you have a head gasket leak. If the leak is big enough, you will lose vacuum pressure. The blower defaults to defrost vents when the vacuum is not strong enough. I had a leak in a vacuum line, causing the blower to switch to defrost, no matter what it was set to.