Joined
·
1,083 Posts
OK, here’s an interesting one…..
Air con was working last year, but condenser was leaking. Just fitted a new condenser today and the guy turned up to charge it (good guy, used him before)
Vacced the system down, it held a good vacuum, then went to add gas and found the compressor wasn’t cutting in. After lots of messing around we find that there is no power getting to the compressor. We powered it directly to gas and oil the system and everything works great, nice and cold and electric rad fan cutting in when it should (it was seized, I freed it off during the new condenser install)
So we started checking components. The first thing that was obvious was that turning on the air con or re-circ button resulted in a rise in the revs so the system saw it had gas, infact the system is all working perfectly, except no power is getting to the compressor.
Checked all the 4 fuses, all ok. Shorted out the 2 sensors on the dryer, one turned on the fan and the other caused the revs to rise or fall, confirming what we had seen earlier. Shorted out the sensor in the passengers foot well that shuts off if the system is too cool (it turned the air con off for a while to let it 'warm up') so that was working too.
Looked at the sword connection, all appeared ok. I had changed the pollen filter since the system had worked last, so the sword was a prime suspect, but it all seemed fine.
Infact EVERYTHING is fine, except the compressor isn’t being powered. Obviously there are several things inline on the compressor’s power feed that are interrupted to prevent the compressor running in case of problems. But as far as we could see we had eliminated them all. It feels like a sensor down, a blown fuse or a bad wiring connection.
We’ve run out of things to check, air con worked fine last year until the gas leaked out, but all components were fine. The system's now gassed and oiled with a brand new condenser, sat there doing sweet FA
The only other things that are slightly strange, but I don't think have a bearing, are the outside temp sensor was reading very low when I first re-connected it (30 degrees) bit since seems to have reset itself and is working fine, and I have low oil and pad wear warnings just come up as it's coming up for a Service 2. But I'm sure neither of them act as a cut-out to the compressor, do they? I've run the car 50 miles tonight with the air con turned on and it hasn't suddenly started working so that seems to rule out a bad connection...
Who’s got any ideas ??????
Air con was working last year, but condenser was leaking. Just fitted a new condenser today and the guy turned up to charge it (good guy, used him before)
Vacced the system down, it held a good vacuum, then went to add gas and found the compressor wasn’t cutting in. After lots of messing around we find that there is no power getting to the compressor. We powered it directly to gas and oil the system and everything works great, nice and cold and electric rad fan cutting in when it should (it was seized, I freed it off during the new condenser install)
So we started checking components. The first thing that was obvious was that turning on the air con or re-circ button resulted in a rise in the revs so the system saw it had gas, infact the system is all working perfectly, except no power is getting to the compressor.
Checked all the 4 fuses, all ok. Shorted out the 2 sensors on the dryer, one turned on the fan and the other caused the revs to rise or fall, confirming what we had seen earlier. Shorted out the sensor in the passengers foot well that shuts off if the system is too cool (it turned the air con off for a while to let it 'warm up') so that was working too.
Looked at the sword connection, all appeared ok. I had changed the pollen filter since the system had worked last, so the sword was a prime suspect, but it all seemed fine.
Infact EVERYTHING is fine, except the compressor isn’t being powered. Obviously there are several things inline on the compressor’s power feed that are interrupted to prevent the compressor running in case of problems. But as far as we could see we had eliminated them all. It feels like a sensor down, a blown fuse or a bad wiring connection.
We’ve run out of things to check, air con worked fine last year until the gas leaked out, but all components were fine. The system's now gassed and oiled with a brand new condenser, sat there doing sweet FA
The only other things that are slightly strange, but I don't think have a bearing, are the outside temp sensor was reading very low when I first re-connected it (30 degrees) bit since seems to have reset itself and is working fine, and I have low oil and pad wear warnings just come up as it's coming up for a Service 2. But I'm sure neither of them act as a cut-out to the compressor, do they? I've run the car 50 miles tonight with the air con turned on and it hasn't suddenly started working so that seems to rule out a bad connection...
Who’s got any ideas ??????