Hello, i am having a problem with my A/C. A few days ago the A/C compressor started working just 2 minutes after car startup after that it stopped and did not want to start again. Days later went on for 2-3 minutes and again off all day. Now does not want to come on at all.
I am suspecting de A/C pressure switch but i can not find it anywhere. Does anyone know where it is on the engine is 2.7D ? I found some locations but they don't match. Also no fault codes on the tester.

 

How long since the AC was last serviced? If the refrigerant is very low, the AC pressure sensor may be operating properly and preventing the compressor from running dry.

There are several other things to investigate, too. Do the symptoms change if you bump the selected temperature down until LO is displayed? This changes the control from automatic to manual and is very helpful for troubleshooting. Try swapping the compressor control relay, too.

More details in my troubleshooting guide:

https://www.jaguarforums.com/forum/s...ol-how-185002/


Posts #4 and #5 are most appropriate for your situation.

Please keep us updated with any findings.

 

Refrigerant is full, fuse is good, relay is good. No matter what i do, the compressor does not want to come on.

 

How do you know it's full?

 

Because i've just added around 200ml iesterday.

 

I would read the DTCs or DATALOGGER for the Climate Control Module but you will need a dealer lever diagnostic tool.

I have No info on 2.7D cars.

 

Because he's got his heart set on the pressure sensor.

Per figure 03.8 of the wiring diagrams, the sensor is located on the US driver's side, on the line between the compressor and the condenser:

http://jagrepair.com/images/AutoRepa...cal-2005on.pdf

Probably more details in the service manual, but I can't open the huge PDF from my creaky old tablet:


http://jagrepair.com/images/AutoRepa...M-Workshop.pdf


If the pressure sensor doesn't help, please work through my troubleshooting guide, linked in my previous message. There are some basic electrical checks for the compressor clutch and control circuit. There are even steps to briefly jumper the clutch to make sure it is responding correctly and to help rule out an input problem.

 

So it could be overfull.

Or still not full.

So far as I can see, adding 200ml tells you nothing about whether the compressor should run.

Also, if it was already full, then it now how has too much in it and that's bad.

Your best bet looks to be to follow Bob's advice. Or Karl's if you'd prefer, but the proper dealer tool is there for good reason.

 

It is not overfull, you don't just put it in with the bottle.... the system needs 700+/-50ml. Now has 720ml ...before had around 500ml, the compressor works even with lower level...it is not an issue. I suspect the HIGH level pipe pressure switch to be the fault, not reading the correct psi and shutting off the compressor.
I tried bypassing the compressor's relay and still nothing.

Thanks kr98664 for the pdf's

 

How do you know it had 500 before?

It's done by weight, but that is volume!

 

You are corect. My mistake, 500grams not ml was the amount of freon the machine retrive from the system befor vacum test and refill.

 

That was post #11 and you finally tell us that.

It's really hard to help people where you have to drag info out of them

 

An easy way around this is to take mind reading pills. They let you quickly determine what somebody else is thinking, with no need to even ask. Turns out my wife has been using them on me for years...

All seriousness aside, one more possibility to consider. The AC compressor clutch has an auto-reset thermal overload switch. If the coil gets too hot for any reason, the switch opens and cuts off electrical power to the clutch. This might explain the intermittent nature of the fault.

Shouldn't be too hard to test. Duplicate the fault, so the clutch has disengaged. Shut off the engine and remove the relay. Measure resistance to ground from the relay socket. Details in the troubleshooting guide. You'll have to work quickly before the thermal switch cools and resets itself. If you see an open circuit (infinite resistance), but later it returns to normal after the switch cools, you've found the problem.

 

Yeah but I don't have access to your wife to get some pills!

 

Found the problem... the coil to the clutch is dead. Have to replace the compressor.

 

A/C problem

 

I am having a similar problem as Gocci. My a/c has been blowing hot air for several weeks. The other day I turned on the defroster and it began blowing cold air. I switched it back over to a/c and it blew cold for several hours and then blew hot again. This happened again with the defroster blowing cold but, when I switched back over to a/c it only blew cold for about 5 minutes. It continue3d to blow hot air for several more days. One day I just revved it up to 4 grand and it began to blow cold again but,as soon as I dropped the rpms it blew hot again. It has not been cold since then.

 

First of all is it normal outside air, or HOT air ? Makes a huge difference in determining the problem.

1. Check the amount of Freon in your system
2. Check fuse F32, and R8 relay, bypass the relay if necessary.
3. If still does not work, measure the voltage to the socket at the compressor. If you have 12v and still dosen't come on. Than is the clutch and you need to replace the compressor same as me.

 

Lots of possibilities here. The first that comes to mind is a problem with the Dual Climate Control Valve (DCCV). You can easily test it, see post #2:

https://www.jaguarforums.com/forum/s...ol-how-185002/


The test has you measure the air temp at your vents to determine if it is the same as ambient air or warmer. Once you determine that, and replace the DCCV if necessary, proceed to the next section of the troubleshooting guide as needed. You may have more than one fault active, so don't be alarmed. The rest of the guide has you play with the manual/auto settings and watch the compressor clutch to help isolate the fault.

 

[QU OTE=kr98664;2258631]Lots of possibilities here. The first that comes to mind is a problem with the Dual Climate Control Valve (DCCV). You can easily test it, see post #2:

https://www.jaguarforums.com/forum/s...ol-how-185002/


The test has you measure the air temp at your vents to determine if it is the same as ambient air or warmer. Once you determine that, and replace the DCCV if necessary, proceed to the next section of the troubleshooting guide as needed. You may have more than one fault active, so don't be alarmed. The rest of the guide has you play with the manual/auto settings and watch the compressor clutch to help isolate the fault.[/QUOTE]