Question about 2003 Dodge Durango
The first thing I would do is check the A/C system Freon level and pressure with A/C gauges. If you have a small Freon leak in the system and enough Freon has leaked out the low pressure A/C switch will not allow the compressor to come on.
Sometimes with the new R134A Freon systems just a small amount of Freon added to the system will be enough to allow the compressor to come on. You should then have the system checked for a Freon leak, since it is NOT normal to have to periodically add Freon to the system.
If the Freon level checks out OK and you still have problems I would then test the electric cooling fan motor that is up in front of the radiator. This electric fan is needed for the A/C system and the fan should be ON when the A/C compressor is ON. This fan is controlled by a relay and gets a signal from the A/C control head inside the vehicle and the on board computer.
Unfortunately both suggestions are not very easy to test yourself at home and really should be done by a trained mechanic, unless you know what you are doing. Adding too much Freon to the system can do damage.
Posted on Jun 27, 2009
Check for a ground. My wipers will work like heck on high, but unless
the ground wire on the switch is hooked up I get no lower speeds. On
the CJ heaters there is a resistor for lower speeds, and that would be
another place to look.
Normally when the blower is only working on low or high it's more than likely your BLOWER MOTOR RESISTOR
Ninety-eight per cent chance that was the fan speed resistor. I bought one on ebay for $27 and replaced it in about 10 minutes. You need to drop the glove box by pushing in the holder clips. Inside you'll see a part with several wires held to the heater housing by two bolts. Remove the bolts, turn around the assembly, and there's your resistor, ready for replacment. Piece of cake.
Posted on Jun 27, 2009
To check a fan clutch condition the engine must be off. Inspect the fan clutch for leakage at the front or rear of the unit (input shaft and temperature controlled expansion spring). If leakage is observed the fan clutch has failed and needs replacing. Next, take the fan blade and turn it, the fan blade should free wheel, if you cannot turn the fan blade the clutch has locked up and needs to be replaced. Also, there should be no or very little play as you turn the fan, if excess play exists replace the fan clutch.
How to Replace a Clutch Fan
If the fan only works on high, the most common cause is a bad blower motor resister. It will either be on the passanger side of the firewall, or it could be in the blower box.
Have Freon check possible you are low. If youtake a look at the a/c compressor on the from is the clutch start thevehicle with a/c off he clutch won't turn. Now turn a/c on the clutchwill turn. If clutch cuts on and off every few seconds thats a goodindication of low freon.
Is the gauge on the high or low side hose? Youshould be charging from the low-side port. If the system is low onrefrigerant, the compressor will draw the low side down to a pressurethat is too low. A low-pressure cutout switch will cause the compressorto turn off to prevent drawing the low side into a vacuum. If there wasa leak in the system, drawing the low side into a vacuum could allowair to enter bringing along the humidity with it. Moisture in thesystem combines with refrigerant to form an acid which will destroymetal parts.
Once the compressor was switched off, high and low side pressureswill equalize, and the compressor will turn back on. The hissing you'rehearing is the refrigerant changing from a liquid to a vapor at thewrong point in the system. This is supposed to happen in the evaporatorin the dash board where you won't hear it.
A better way of observing the state-of-charge in the system is towatch the sight glass on top of the receiver / drier for bubbles. Youwill not see any bubbles when the system is very low on charge or fullycharged. In your case, you know it's not fully charged. The refrigerantwill go in much faster if you place the can in a pail of hot wa
Posted on Jun 27, 2009
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Posted on Jan 02, 2017
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