Car Ac Only Works On High

The 2004-2014 Ford F-150 with manual temperature and fan controls may have problems with the the blower motor only blowing air on certain settings. Correcting the problem is straight forward and requires.

Blower Motor Resistor How It Works Symptoms Problems Testing

Run the engine until the fan kicks in.

Car ac only works on high. Your AC system is filled with an ac refrigerant making sure the whole system is working correctly. If air is not blowing from the vents it is not the problem of the refrigerant recycling system AC and can be attributed to the blower motor or a vent control actuator. Start the engine and turn the air conditioner on.

This is a well documented problem and is caused by a failing blower motor resistor. If the above checks out ok observe the engine temp gauge while driving from a Cold Start the needle should rise to the lower end of the normal range within 3 miles of normal driving or 5 minutes of stop and go city driving and some heat should be coming out of the heater vents and within 5 miles or two more minutes city it should be blowing a steady blast of HOT air and the temperature gauge should be 14 to 12 of the distance between the low end of the normal range and the high. Most commonly the fan will only run on the highest setting.

Correcting the problem is straight forward and requires. My switch in my car works very well but the air would not blow out at all as I switch till high to low before it broke my ac can only work on high or I had to drive just for my ac can kick in real good but I drive 1999 Saturn SL2. The correct reading will display once the clutch engages and the gauge stops cycling.

If you are noticing that this time is getting longer and longer then it could be the fault of a failing AC Pressure Switch stopping the system working properly. This is a classic blower motor resistor problem which is common on older cars and trucks that use manual fan speed switch controls. Why Isnt My Air Conditioner Working.

However most car makers bypass the blower motor resistor completely when you move the fan speed switch to high. The 2008-2012 Ford Escape with manual temperature and fan controls may have problems with the the blower motor only blowing air on certain settings. Here is how to tell which.

After the system runs for awhile raise the RPMs up to about 1500 RPMs. When a blower resistor fails the highest fan speed usually is the only one that still works because it essentially bypasses the resistor and receives the maximum amount of voltage. This refrigerant system is of high pressure and it can reach 15 bars when the car is running.

For the AC system to work properly it needs this pressure and a specific amount of refrigerant. This can also occur with the ignition key off. If your blower only operates on its highest speed chances are you have the series type of blower motor resistor.

When the engine is on and the AC is on high low pressure readings should be around 30 psi and the high pressure side should be about 250 psi depending on your car. Next move the fan setting from the highest to the lowest. Turn the cars fan motor on high and press the button to turn on the AC.

One of the things that you will know especially if you live in a hot area is the amount of time your AC system typically takes to cool a hot car. This can also be labeled as MAX AC. Most commonly the fan will only run on the highest setting.

If the ambient temperature is higher or lower than normal 70 to 80F the pressures will go up or down accordingly. Once your fan has come on look around the radiator for a bleed port or bleed screw. If your system has a bleed port or bleed screw and you can find it you can fix this air lock yourself.

This is a well documented problem and is caused by a failing blower motor resistor. The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. The AC button has a light on the button that illuminates when the air conditioner is.

This problem will also occur on climate control systems when the speed controller has burned out omitting full power to the blower motor. One possible cause is an air lock in the cooling system. Blower Fan Works on High Only.

This is the most common failure mode.

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