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My ac is not cooling off, I have checked the compressor is working because the clutch is spinning. I tried to service with freon no help. still blowing hot air any recomedations?
is the evaporator pipe getting cold as it comes out of the firewall into the engine compartment? When you tried to add R-134, did it go in?is the evaporator pipe getting cold as it comes out of the firewall into the engine compartment? When you tried to add R-134, did it go in?
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You need your A/C be checked by a proper certified A/C technitian. You might have a leak in your evaporator causing all freon you ad to leak.You need your A/C be checked by a proper certified A/C technitian. You might have a leak in your evaporator causing all freon you ad to leak.
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the obvious first, check freon... second, check fuses, and finally check that the clutch engages on the ac compressor when turned on (you should here a click and notice a small, momentary difference in the idling of the truck) you can also visually check the clutch by watching the compressor when someone else turns it on. if the clutch is not working, the inner part of the pulley does not spin.
There are a few things that can cause this. First off, make sure that the compressor is turning on when you turn on the AC switch. With the AC on full blast, look at the engine, locate the compressor and make sure that the center hub (the clutch) is spinning, not just the pulley around it that the belt rides on.
If the clutch is not spinning, or if it cycles on and off repeatedly, then your AC compressor is not functioning properly. This could be due to a failed compressor or to a low level of freon in the system.
If the clutch is spinning, then the next thing you should check is your freon level, get a temperature-dependent basic freon gauge, (like the one I posted in the link at the bottom) hook it up, set the outside air temperature on the gauge and then it will show you the ideal freon pressure level. What most people do not know is that having too much freon in a system will cause it to blow just as warm as an under-filled system. The freon level has to be in the "sweet spot" for it to properly work.
If your freon is at the proper level and your AC clutch is on and functioning then it could possibly be the AC switch in your instrument panel, or one of a couple of different parts in the engine compartment, but 90 percent of the time the problem will be found within the bounds of what I just listed. Good luck!
Below is a guide to troubleshoot and check system function. This can be done by most folks.
Look at the front of the ac compressor and have someone turn on the ac from inside the car. The front of the pulley(clutch) will spin when turned on.
If it does not spin, the low pressure switch (LPS) is not satisfied. Meaning there is not enough freon in the system to operate the system. Means low freon capicity because of a leak.
The LPS can be jumpered to cause the compressor to run (clutch to engaged) which will draw the freon in the system.
The LPS is usually a two wire sensor on the suction of the compressor. (between evaporator and compressor) Unplug the sensor and install a jumper, this will engage the clutch. Connect a new can of freon and fill to system capacity.
The capacity of the ac system will be on a label under the hood, do not overfill. Probably about 2 lbs. Local parts stores (Auto Zone and Advance) will have freon with stop leak. This may help the leak. They also make a freon with a UV dye. I always add a single can with dye so that if stop leak does not work I can find the leak in the future.
The system should be filled until suction pressure is about 30 to 38 psi..
Remember the flow for the a/c system is : 1. From the compressor a high pressure (HP) gas goes to the condenser in front of the radiator. 2. From the condenser a HP liquid goes to an expansion device (orifice tube or expansion valve) 3. From expansion device the low pressure gas enters the firewall to the evaporator. 4. From evaporator the low pressure liquid/gas mixture goes through the dryer back to the compressor suction.
Look at the front of the ac compressor and have someone turn on the ac from inside the car. The front of the pulley(clutch) will spin when turned on.
If it does not spin, the low pressure switch (LPS) is not satisfied. Meaning there is not enough freon in the system to operate the system. Means low freon capicity because of a leak.
The LPS can be jumpered to cause the compressor to run (clutch to engaged) which will draw the freon in the system.
The LPS is usually a two wire sensor on the suction of the compressor. (between evaporator and compressor) Unplug the sensor and install a jumper, this will engage the clutch. Connect a new can of freon and fill to system capacity.
The capacity of the ac system will be on a label under the hood, do not overfill. Probably about 2 lbs. Local parts stores (Auto Zone and Advance) will have freon with stop leak. This may help the leak. They also make a freon with a UV dye. I always add a single can with dye so that if stop leak does not work I can find the leak in the future.
The system should be filled until suction pressure is about 30 to 38 psi..
you need to put a pressure gauge on the freon input nozzle and see how much freon is already in your system You are probably getting no cooling because the clutch on the front of the A/C compressor is broken, or the switch on the dash is not opening the vents inside correctly.
Putting more freon into an already full system can have unpleasant results.
So if when checking the gauge, the freon levels are ok, next, run the car, and look at the front of the A/C compressor.see if the clutch clicks in and out as the A/C is turned on/off. If the clutch free-spins all the time it needs to be replaced, or if its silent completely, the wiring to the A/C needs to be checked. If the clutch is ok, head under the dash ad listen for the vent doors opening and closing as you cycle the A/C on/off. If you can't hear them, a vacuum pipe or electrical connection/A/C switch is to blame.
You must of lost freon and when there is no freon your clutch will not activate.Must check it for pressure in the lines.If there is pressure check pressure switch.Good luck let me know
Yes the system can be full of freon and yet not work, the pressure switch could faulty, the expansion valve too could be faulty, he drier receiver too.
On switching 'on' the AC , is the AC compressor workingor rather does it engage?
The AC compressor clutch too could be not functioning.
I guess you have to go step by step to check first if the AC compressor does rotate on switching 'on' the AC.
is the evaporator pipe getting cold as it comes out of the firewall into the engine compartment? When you tried to add R-134, did it go in?
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