Air condition compressor clutch not engaging - Printable Version +- Berlingo Forum (https://www.berlingoforum.com) +-- Forum: Specific Model Chat, Problems and Faults (https://www.berlingoforum.com/forum-8.html) +--- Forum: M59 Berlingo (https://www.berlingoforum.com/forum-28.html) +--- Thread: Air condition compressor clutch not engaging (/thread-17104.html) |
Air condition compressor clutch not engaging - poulsenj - 30-06-2018 Citroën Berlingo MK2 1.6i (TU5JP4) 2006 - VIN: VF7GJNFUC93352754 I bought the car recently and had the air conditioner re-gassed. The system has no leaks, 700g cooling agent was emptied out, and it was re-filled with 600g (according to specifications) When I push the AC button the indicator lamp activates, but the AC compressor clutch doesn't engage. I have checked the AC clutch by applying 12 volts directly - it engages and shortly after there is cool air flowing into the cabin. The ventilator fan also sharts shortly thereafter. I made the following readings using Lexia (via Diagbox 7.62) having the AC activated (AC light on): ECU (Injection Control) readings:
BSI readings:
I cannot see from the user manual which fuse is supplying the AC compressor clutch - can anybody provide me a curcuit diagram for the AC system? Any ideas what the problem could be? And why is the pressure reading that high? RE: Air condition compressor clutch not engaging - Tomcat3 - 30-06-2018 Hi there welcome to the forum, not sure if this will help but looking at earlier wiring diagram look at engine fuse box Fuse A and C and on interior fuse box look at fuse F8 F15 F14 F30 and F26. According to the wiring diagram they all have something to do with the air con. If its any help there is a manual download on the site if you have a search. Good luck. RE: Air condition compressor clutch not engaging - jj9 - 30-06-2018 That's the most comprehensive technical 1st post I have ever seen on the forum, well done with your diagnostics. However, forget the technical stuff..... Was the AC working when you got the car? If so why the re-gas? Did the system work ok after you had had it re-gassed? For how long? . RE: Air condition compressor clutch not engaging - poulsenj - 01-07-2018 (30-06-2018, 06:59 PM)Tomcat3 Wrote: Hi there welcome to the forum, not sure if this will help but looking at earlier wiring diagram look at engine fuse box Fuse A and C and on interior fuse box look at fuse F8 F15 F14 F30 and F26. According to the wiring diagram they all have something to do with the air con. The engine fuse box has fuses F1 through F18 (all fuses are good) - it hasn't any labeled A and C (I haven't looked at the maxi fuses underneath - I assume these are good, because I can measure 12V on both sides of each fuse when the right outputs are activated). The interior fuse box (the BSI) hasn't got all of the fuses you mention, F8, F26 and F30 are not existing on my car. All interior fuses are good. I guess the specific wiring diagram for this car is needed. I searched the forum and only found the Haynes book for mk1 models. I don't think the wiring diagrams in the book match my car. RE: Air condition compressor clutch not engaging - poulsenj - 01-07-2018 (30-06-2018, 11:13 PM)jj9 Wrote: That's the most comprehensive technical 1st post I have ever seen on the forum, well done with your diagnostics. Thank you for the kind words.
RE: Air condition compressor clutch not engaging - poulsenj - 01-07-2018 From the Lexia BSI Activation menu I tried to activate the 'Air conditioning compressor control'. According to the instructions I should be able to hear a clicking sound, but nothing was clicking. Is the AC compressor clutch driven by a relay on the BSI itself? BSI Information (from Lexia):
RE: Air condition compressor clutch not engaging - jj9 - 01-07-2018 Could the pressure switch be dodgy? Check all of the basic things first no matter what the diagnostics are saying. Take a look on youtube for air con fault finding, that may help you. . RE: Air condition compressor clutch not engaging - poulsenj - 03-07-2018 I found the right circuit diagram via SEDRE. I also had Lexia connected again, this time I typed the 5-digit RPO instead of the four last digits. I don't know if it was of any significance, but this time I was able to activate the AC compressor clutch from Lexia. I analyzed the circuit diagram and I think this is the data/signal flow:
Item 4 thus seems to be the problem, as if the BSI waits for some other condition to be fulfilled. And yes indeed, there is a signal (wire 8072) from the cabin blower control to the BSI indicating if the blower is running or not. The blower must be running before the AC cuts in. I tried to wiggle the blower control knob while it was in position 1, and I was able to get the AC compressor to cut in. It stopped again in positions 2-4. Problem found, and now I have to look for a new cabin blower control. Tanks for the input in the thread. RE: Air condition compressor clutch not engaging - jj9 - 03-07-2018 Your fault finding is excellent, well done. Is it the control knob switch of the resister pack that is the problem? . RE: Air condition compressor clutch not engaging - Collapsedsuspension - 03-09-2018 This is weird - my 1.6i m59 has developed the same fault! Compressor kicks in on blower speed 1 only. Did a new heater control fix the problem? |