I'm experiencing some issue with the ventilation system in my Focus. The vent selector nob is stuck on defrost mode which for me isn't an issue, but no matter what setting I have the air speed selector on the fan motor will no turn on. I recently replaced the HVAC fuse because I lost the AC for awhile. But now it is winter and not having hot air blowing on the windows is a problem haha. I'm not sure if the fan motor went or if its a fuse problem. Also I'd like to add I did have air flow before but only when it was set at speed 4.
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Re: Air Conditioning problems.
Fan motors in cars fail commonly. They wear out the brushes and the motor stops or the fuse blows. The other issue with the mode selector may not have anything to do with the motor. The actuator on the mode selector can become stuck or broken and then the air delivery wont go to the right area. All these things should be visible under the dash or behind the glovebox.
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This is caused by a low engine vacuum, the engine vacuum is low when you accelerate, the HVAC system loses vacuum to the mode control vacuum switch and defaults to the defrost ducts for safety. You likely have a leaking mode control vacuum switch in the control panel of the heater AC system (HVAC).
suspect a control panel issue as this HVAC (heater, ventilation, Air conditioning ) system should be all electric... If you can pull the control panel out looking at the back of it will answer your question... are the cables or just wires..
It is all electronic these days an electric motor is controled by the selector on the dash. Remove the dash surround: gear selector in 1st engine off, tile steering wheel down, push down FIRMLY on the top of surround and pull towards you and off it comes. Remove the two screws that hold the heater/air cond. control in, there are 4 plastic clips as backup release them and gently remove the control, inspect for loose connectors (there are 2) it helps to run the blower to see if you have found the problem- I did.
--- HEATING AND AIR CONDITIONING
Refer to Section 1 for discharging and charging of the air conditioning system.
The heating system provides heating, ventilation and defrosting for the windshield and side windows. The heater core is a heat exchanger supplied with coolant from the engine cooling system. Temperature is controlled by the temperature valve which moves an air door that directs air flow through the heater core for more heat or bypasses the heater core for less heat.
Vacuum actuators control the mode doors which direct air flow to the outlet ducts. The mode selector on the control panel directs engine vacuum to the actuators. The position of the mode doors determines whether air flows from the floor, panel, defrost or panel and defrost ducts (bi-level mode).