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Old 20-09-18, 01:37 PM   #1
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Default AC low pressure switch location

Hi, can someone please tell me the location of the low pressure switch and the compressor relay???
My compressor is working (I hot wired it to check) but the clutch is not engaging as in it does not receive signal...
cannot find the low pressure switch to check if its working nor can i find the compressor relay...Any suggestions??
Thanks, Joris
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Old 20-09-18, 07:09 PM   #2
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Car details would help....a lot!
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Old 21-09-18, 03:22 AM   #3
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Default oops

Sorry it was very late..
How stupid
I own a 2007 307 2.0 HDI dohc

Joris
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Old 21-09-18, 07:28 PM   #4
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According to Haynes the relay is in the main fuse box. It also shows a Pressostat in the circuit diagram but no mention of where it is I am afraid. This is the A/C circuit without climate control, mind.
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Old 21-09-18, 08:16 PM   #5
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The only sensor shown on the A/C Pipework is located adjacent to the filling point located on the rear end of the pipe before it snakes round behind the engine. Not the filling point at front of engine bay, somewhere near strut turret i would guess from diagram
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Old 21-09-18, 09:09 PM   #6
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You didn't say if you actually have sufficient pressure in the system - I presume you have already checked that?
When the garage was fixing mine they decided it was holding gas but the clutch was sticking. When I hooked it up to planet I discovered it was locked out, took it back and the mechanic was like "it is defintiely holding gas, look - oh!". Turned out the condenser was cracked. Works great now. Wish the rest of the car worked as well!
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Old 21-09-18, 09:21 PM   #7
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I'd certainly look for low pressure first.
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Old 21-09-18, 10:49 PM   #8
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Re Brilec: I know but where is it is the question; The one described by windy1603 is on the high pressure side ( the leaner pipe). Following the fatter pipe, usually the low pressure pipe, there is no sensor/switch
Re JimW: The system has been re gassed. I Australia you can only have this done by a pro aircon person. They emptied the system, checked for leaks and then re gassed. To check the workings of the compressor I ran a wire straight from the battery to the compressor. This engaged the clutch and the air-con was blowing cold air.

Re Madbadandold: I will check these again, i have not seen this relay in the main fuse box..Silly Question maybe, my a/c controls are is digital, does this mean it is an a/c with climate control?

Thanks for trying to point me in the right direction guys! Still no success. Has anyone got access to the electrical wiring schedule?
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Old 21-09-18, 11:38 PM   #9
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These systems are not like the old systems where basically only low/high pressures would prevent the system from working. In these modern systems, any number of seemingly unrelated things can shut them down. Faulty temp sender unit, faulty cooling fans/system etc.

You need to scan the system with PP2000 [live and static] and see if there are strange readings [temp especially] and use PP2000 to activate components to see if they are functioning [like fans]

Also, CAREFULLY check ALL fuses in fusebox and BSI for continuity/corrosion.

Good luck...
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Old 22-09-18, 09:22 AM   #10
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The sensor is both high/low pressure. Digital display is climate control.

Does your internal blower fan work. If the internal fan does not work it locks out A/C clutch.

Basically the climate control display has integrated ecu which switches clutch and engine ECU via BSI/under bonnet fuse box (relays integrated into fuse box)
as long as it sees correct system pressure, operating fan and demand for cooling
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