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Air conditioning My air conditioner and heat only come out via the defrost, can I fix this myself?

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Yes you could, all you have to do is to locate a faulty or loose or broken vacuum hose under the hood......that is all the problem you have.......

Posted on Aug 15, 2008

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The blower on my 2001 ford experdition is blowing but the windows are not defrosting

Many newer models use the air conditioner compressor as a heat pump to defrost the windows.

Check the freon level on the air conditioning system, or at least bring the vehicle into a warm heated garage and run it just a minute or so to test to see if the AC is working.

Be sure to only run it a minute or so or better yet ventilate the exhaust out of the garage to prevent buildup of deadly carbon monoxide gas in the garage or house.

Dec 06, 2013 | Cars & Trucks

1 Answer

How do i keep the air conditioner from coming on

Well, you have PART of the facts. The whole truth is that the air conditioning does NOT come on if you have the heat turned on and you are using any mode OTHER than DEFROST or A/C. You may not realize it, but you WANT the air to come on when you are using the defrost mode. The reason for this is because the cold coils of the A/C evaporator causes moisture in the air to condense and the moisture then is able to collect and run out the drain tube at the bottom of the A/C housing which empties outside the car. So the air goes through the A/C coils first to be dried, then through the heater core to be heated.

Without this feature in wet weather conditions, the heater would simply heat the moisture and blow it onto your windshield and into the rest of the vehicle. This will cause your windshield to fog up WORSE than if you did not use the defrosters. This will also cause your side and rear windows to fog up as well. You have probably noticed the side windows fogging also when you are using the floor heat. Have you noticed that when you put the mode selector in the defrost position to clear the windshield, that the side and rear windows will also clear? This is because the A/C is DRYING the air inside the car.

Another part that you are probably not aware of is that if the outside air temperature is below 35 Deg. F the air conditioner compressor will not run at all - no matter WHAT mode you have it in. It won't even run in the A/C mode. This is for two reasons:
1. It protects your A/C system from operating at too low of a temperature which can cause freezing of the A/C components and damage to the system.
2. If the outside air is already cool, there will not be much moisure in it to begin with and whatever moisture there is will still condense on the A/C evaporator coils as it passes through it simply because it is cold.

You may be experiencing the A/C clutch cycling on and off in the cooler weather with the defrost on. This is NORMAL. However, if it is causing the engine to surge dramatically when it cycles, then the problem is NOT that the A/C is causing undue stress on the engine, but rather that the Idle Air Control valve (IAC) is not reacting to this change like it should. The IAC is supposed to raise the engine RPM a slight amount just as the compressor engages to lessen the affects of the extra load that is placed on the engine. Some "surging feeling" cannot be avoided, however, if it is severe, then it needs to be checked out.

Nov 17, 2011 | 2000 Ford Taurus

1 Answer

The blower on my a/c on 2002 chevy trailblazer only blows from the floor vents and the defroster vents but not the dashboard vents how can this be fixed. Also, it only works on 5

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.

Aug 05, 2011 | 2002 Chevrolet TrailBlazer

2 Answers

The air conditioning does not blow through front vents but through windshield vents, what is the problem?

This is a common problem on all Astro/Safari vans. The problem is a leak in the vaccum lines that control the vaccum switch responsible for changing air direction from the defrosters, dash vents, floor vents..etc.
Many of the problems that plaque the Astro/Sarfari vans and many other "Mini-Vans" is the build up of excess heat in the engine compartment. It\'s a tight place to put a V6-4.3 Vortec engine and the heat generated bounces back and cooks everything on the engine (coils, modules, sensors, wiring, and of course plastic vaccum hoses). No need to mess with your switches or anything behind the dash -- replace those thin plastic vaccum hoses to operate the vaccum switch (located just below the A/C canisters, to the right of the heater/ac blower housing) and your dash switches will magically send heated or cooled air where you want it.

Oct 25, 2010 | 2003 GMC Safari

2 Answers

The air conditioning in my 2005 T&C stopped working. Right before it stopped there was a "burnt" smell coming through the vents. What happened?

No air coming from air conditioning vents
  1. Check the air conditioner fuse and replace as necessary.
  2. Air conditioner system discharged. Have the system evacuated, charged and leak tested by an MVAC certified technician, utilizing approved recovery/recycling equipment. Repair as necessary.
  3. Air conditioner low pressure switch defective. Replace switch.
  4. Air conditioner fan resistor pack defective. Replace resistor pack.
  5. Loose connection, broken wiring or defective air conditioner relay in air conditioning electrical circuit. Repair wiring or replace relay as necessary. Air conditioner has a smell when used
    1. The air conditioner evaporator drain hose is blocked or partially restricted, allowing condensation to build up around the evaporator and drainage tray. Clear the drain hose where it exits the passenger compartment.
    2. Check compressor clutch wiring, electrical connections and compressor clutch, and repair or replace as necessary.

Oct 10, 2010 | 2005 Chrysler Town & Country

1 Answer

No heat or air conditioning

There is a deflector vent door actuator motor that is not working,the dash will have to be removed to replace it.

Jun 08, 2010 | 2005 Chevrolet Aveo

1 Answer

Need to replace heating core

  1. Disconnect and remove the negative battery.
    CAUTION After disconnecting the negative battery cable, wait 2 minutes for the driver-s/passenger-s air bag system capacitor to discharge before attempting to do any work around the steering column or instrument.
  2. Drain the cooling system into a clean container for reuse.
  3. Remove the instrument panel by performing the following procedure:
    1. Turn the steering wheel in the straight-ahead position.
    2. Remove the knee blocker from the instrument panel.
    3. Remove the steering column; do not remove the air bag module, the steering wheel or switches from the steering column.
    4. From under the driver-s side of the instrument panel, disconnect the following items:

      Instrument panel wiring harness connector from the 100-way wiring harness connector at the left side of the inner panel. Side window demister hose at the heater/air conditioning housing demister/defroster duct on the driver-s side.
    5. Remove the glove box.
    6. Reaching through the glove box opening, disconnect the following items:

      Two halves of the heater/air conditioning system vacuum harness connector. Instrument panel wiring harness connector from the heater/air conditioning system wiring harness connector. Instrument panel wiring harness connector from the passenger-s side air bag module wiring harness connector. Side window demister hose at the heater/air conditioning housing demister/defroster duct (passenger-s side). Two halves of the radio antenna coaxial cable connector. Two instrument panel wiring harness connectors from the passenger air bag ON/OFF switch wiring harness connector. Passenger-s side air bag ON/OFF switch wiring harness from the retainer clip on the plenum bracket that supports the heater/air conditioning housing just inboard of the fuse block module. Two lower passenger-s side air bag module bracket-to-dash panel nuts.
    7. Remove the upper cover from the instrument panel.
    8. Remove the 3 instrument panel-to-door hinge pillar screws.
    9. Remove the 4 upper instrument panel-to-dash nuts.
    10. Using an assistant, remove the instrument panel from the vehicle.

  4. If equipped with air conditioning, discharge and recover the air conditioning system refrigerant.
  5. Disconnect the refrigerant lines from the evaporator. Plug the refrigerant openings to prevent evaporation.
  6. Disconnect the heater hoses from the heater core tubes.
  7. Disconnect the heater/air conditioning system vacuum supply line connector from the T-fitting near the heater core tubes.
  8. In the engine compartment, remove the 5 heater/air conditioning housing-to-chassis nuts. If necessary, loosen the battery hold-downs and reposition the battery for access.
  9. Remove the cowl plenum drain tube from the heater/air conditioning housing stud; it-s located behind the cylinder head on the cowl.
  10. From the bottom of the heater/air conditioning housing, remove the floor duct.
  11. On the passenger side, remove the heater/air conditioning housing-to-plenum bracket screw.
  12. Pull the heater/air conditioning housing down far enough to clear the defrost/demist and fresh air ducts, then, rearward far enough to clear the mounting studs and the evaporator drain tube to clear the dash panel holes.
  13. Remove the heater/air conditioning housing assembly from the vehicle.
  14. Remove the heater/air conditioning housing upper case.
  15. Lift the heater core from the lower half of the heater/air conditioning housing.a35714c.gif


Feb 13, 2010 | 2005 Jeep Grand Cherokee

1 Answer

Air conditioner staying on...

Many cars use air conditioning as part of the defrost function. Cold air will clear windshield faster than hot air.

Aug 01, 2008 | 2001 Honda Civic

4 Answers

Air conditioning and heating

The vacuum line on the drivers side of the intake manifold just below the throttle body fell off.

May 26, 2008 | 2003 Jeep Grand Cherokee

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