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Hello,
I have Jaguar XF 2.7d and someone has built S-type compressor on it. Is it possible that it can work? Because last owner said that it worked in his hands.
When I bought, condenser leaked so I thought that the problem is there and when I re-gassed it didn't work. Only 1.2 volts come to connector and no fault codes in climate.
Hello! Regarding the second question, about the operation of the cooling fan after disconnection of the pressure sensor connector - I guess, it is absolutely normal. When I was tinkering with my AC, I noticed the same thing. Regarding the first question - from what I was able to tell from taking a look at the S-type compressor, I think that they should work on XF as well. The connector is similar, with two wires, so my guess is that it operates according to the same principle - it operates the electromagnetic clutch with the help of voltage and the clutch can be switched off, partially engaged or fully engaged. From what I remember, the voltage of 1.2 volts is far too low for the clutch to engage.
I suggest you to try the following: disconnect the connector from the AC unit, and connect 12 volts from some other source, you can take the current from fuse box or some othe battery. You should hear the click of electromagnetic clutch. That way you should be able to diagnose or rule out bad clutch. You do not have to be afraid about testing the clutch, because it is a quite simple and robust electromagnet, and they do not fail too often.
If you hear the click, you can continue with your testing - now you can switch on the car and connect the 12 volt supply to you AC compressor again. Now your AC should be operating, the AC clutch should be engaged all the time. If your AC system is full with refrigerant and oil, there is not risk in such experiment, and you can wait for a few minutes and check, whether you are getting cold air in the saloon. That way you will find out whether your AC compressor from S-type is operational. If it is operational - at this point you should also check radiator fan - it should be working, because it measures the pressure in the AC system and should engage the fan.
So if your experiment with the AC compressor is succesfull, and if it operates without any strange noise and blows you cold air, you can rule out the AC compressor and AC clutch, and look further at electrical system. If I remember correctly, the AC control unit checks following parameters- coolant temperature sensor, AC pressure sensor, radiator fan rotation, evaporator temperature sensor, outer temperature sensor and engine speed. So in theory, widely speaking, there can be there types of faults - it can be problem with the control module, it can be problem with one of the sensors, or it can be bad wiring to the AC compressor. Since you do not have any diagnostic codes, I would suspect the third option.
In my case I cured the problem by installing additional earth wire to the AC compressor connector, so I suspect that the wiring somewhere in the engine bay became bad - because when I connected AC directlly to the respective wire in the saloon near the passenger side fuse box, the AC started to work, and the voltage reading (which I took before attaching) was also fine - up to 13 volts or something like that. So I found out that some current "got lost" along the way. Later I also took additional measurements in the AC compressor connector and found out that it actually also gave those 12 volts, when the AC was operational, but when I connected it to the AC compressor without additional earth wire, it was not working again.
Anyway if you want to tinker with the electronic part, of course, getting the electrical diagram of the car is a must. They are not too complicted even for a person with very basic knowledge in car electronics, like myself
Does the compressor solenoid also run on 12v?
My compressor magnetic clutch works and I also have checked wires from climate module to compressor, they are fine. But where do u think I should take positive ? And have u ever built the same thing ? S type compressor to XF I mean.
Does the compressor solenoid also run on 12v?
My compressor magnetic clutch works and I also have checked wires from climate module to compressor, they are fine. But where do u think I should take positive ? And have u ever built the same thing ? S type compressor to XF I mean.
On my car there is the only one connector, with two wires, and it operates AC clutch, which does contains those solenoids for the clutch, and there is no other wires to operate AC compressor, other than those. I suggest that for test purposes you should take 12 volts from the engine bay fuse box, you will be able to find suitable source easily, if you have voltometer. My compressor is native for the XF (to my knowledge), so, if you want additional reassurance, it might be a good idea to check workshop manual for S-type.
But here is what manual says about controlling of the AC compressor:
Hello, John, well, in our case, with the 2.7D engine, there is a little bit older type of AC compressor, which still has clutch, and it is visibly disengaged, if you turn off the climate control.
On my car there is the only one connector, with two wires, and it operates AC clutch, which does contains those solenoids for the clutch, and there is no other wires to operate AC compressor, other than those. I suggest that for test purposes you should take 12 volts from the engine bay fuse box, you will be able to find suitable source easily, if you have voltometer. My compressor is native for the XF (to my knowledge), so, if you want additional reassurance, it might be a good idea to check workshop manual for S-type.
But here is what manual says about controlling of the AC compressor:
Mine has too one connector and wires what goes clutch and solenoid I think ?
Do you have also XF with S type compressor ?
07-05-2021 | 06:08 AM
AC Problem
