Re: 2001 f150 5.4l 4x4. Compressor constantly kicks on
Yes more than likely your truck is low on 134 but to get the right amount it needs to be sucked out and recharded but i just use a set of a c gauges and kind of guess on the pressures depending on temperture out side. and temperture of the trucks air at the vents the parts stores sell a recharge can with a gauge they can be used also. now just go to the pump and follow the lines and you will find a cap (red or blue ) you want the blue one that is were u can safely charge if there is no caps you will find a couple of nipples you want the one that is greater in diameter.
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On your gauge,is "red" high pressure or low pressure?
If you are seeing a high pressure on your low side connected gauge and the compressor is not running,that is a "full charge" or better stabilized in the system.If your compressor is not "kicking in" you may have a defective electrical component in the A/C system.With the engine running,you can jump 12v power the the compressor clutch momentarily just to see if it is working.Don't leave it jumped to long as the system is designed to cycle with pressure from the low side pressure switch which is the next place to check and the compressor can also be jumped at the low side switch.
If your "red" is low or no pressure,then you have a leak and repairs to the system to stop the leak will have to be made.You can add 134a at this time with the engine running and A/C requested,and as pressure rises in the A/C system,the compressor should "kick in" and cold air should start flowing in your dash vents.45 degrees at the dash vent airflow temp usually equals a full charge.
DO NOT add any aftermarket "134a" that shows an EXPLOSIVE label on it.These are not 134a and are usually butane and/or propane mixes that you MAY NOT want spraying on you in a collision/any situation where the A/C system has become ruptured/compromised.
Open the hood. There is a tag for the A/C. It tells you what type and much the system holds. R134A is used mostly. But I had just read an article about new freon they are starting to use. It didn't state if they were compatible. as far as the ports. There are two of them. High side has a big cap, low has a small cap. Not hard to find, follow the aluminium lines. You add at the small cap/low pressure line.
Make sure your blower fan is turned on and is blowing air. When you push your a/c button the yellow light should come on. If it is not blowing cool, it could be several things. Low on 134a or the control that has the a/c button on it could be bad or blown fuse, bad compressor, etc. If the air is cool but not cold the 134A is low. If it is still blowing hot, check and make sure that the clutch on the compressor is locked in. It most likely is not. Check ac fuses and ac relay, if they are good, check the 134a ,if low, refill it. This should fix it. Remember that if the a/c clutch is not locking in, you cannot add 134a because of no circulation.On some vehicles, if it is completely out of 134a, the relay will not trip and you will have to bypass the relay to provide power to the compressor to fill it. If you do all of these and it still does not work, you will need to take it to a professional. If you need to, reply back and I will give you more possibilities.(I think that you mean evaporator coil)
Need to leak check the system,recover the refrigerant, vacuum out all air & moisture, I would assume was put in there by any number of people trying to add to it over the years with no a/c experience & not using the proper manifold gauge set. Then charge to the correct number of onces
No it does not, you can add R134a to the low side of the system and when the low side pressure reaches the minimum psi the compressor will kick in. If you need to add more than 1 can then you may have a leak and will need to have it serviced.
Small port is the suction side of the system. Make sure you have a gauge to monitor system low side pressure. Ambient temperature makes all the difference as to what pressure it should be when full. Probably between 25 and 40 psi.
you should be adding the 134a to the system the low pressure switch is doing its job by not allowing the compressor to kick on, it wont kick on until there is enough 134a in the system to be above the preset pressure for the low pressure switch.
It will normally come on by itself once you add the 134a if doesn't come on by itself I'm thinking you have a bad pressure swith in which is locacted in the A/C line in itself up on the passenger side by the firewall you can uplugged it there and jumper the 2 contacts together if the compressor kicks on it is either a bad pressure switch or there still isn't enough 134a in the system.