MORE Posted March 3, 2019 Report Share Posted March 3, 2019 (edited) Hello guys. Due to the rising of the temperatures here in Italy, I faced a problem with the A/C. Basically, I start the A/C, after a while, fresh air arrives, but, in heavy traffic, cooling temperature increases, normally it stays on 90 Deg C, but at this point, the A/C compressor swith off. Only if, coolant temperature goes slight down, or manually ( not all the time ), I switch off and then on the cabin fan, the A/C runs normal. R134 is ok, was recharged on last January. Any idea? BR Edited March 3, 2019 by MORE Quote Link to comment Share on other sites More sharing options...
mk2 Posted March 3, 2019 Report Share Posted March 3, 2019 R134 pressure too high. Over pressure switch turns off the compresser I'm guessing...? Quote Link to comment Share on other sites More sharing options...
MORE Posted March 4, 2019 Author Report Share Posted March 4, 2019 mmm I don't know... Using vag, no fault codes, but I can't check the HVAC because it's a manual A/C, and my vag supports only auto A/C. BR Quote Link to comment Share on other sites More sharing options...
mk2 Posted March 4, 2019 Report Share Posted March 4, 2019 If the compressor turns off, then something is disconnecting it. On most vdub cars, there is a fan controller unit, which also has a relay which controls the 12v compressor coil. It could be that? Quote Link to comment Share on other sites More sharing options...
MORE Posted March 4, 2019 Author Report Share Posted March 4, 2019 I do not know ... actually I thought it was the G65 sensor ... Quote Link to comment Share on other sites More sharing options...
mk2 Posted March 4, 2019 Report Share Posted March 4, 2019 Is the compressor turning on and off while the car is stationary? Idling. It should be. Might just need a new overpressure switch. Quote Link to comment Share on other sites More sharing options...
MORE Posted March 4, 2019 Author Report Share Posted March 4, 2019 Oh my gosh... Can I replace it by myself or is difficult? Quote Link to comment Share on other sites More sharing options...
Rich Posted March 4, 2019 Report Share Posted March 4, 2019 Fortunately the pressure switch on the bulkhead is an easy one you can swap yourself. If you want to check that is it there is a simple bypass test you can do. Quote Link to comment Share on other sites More sharing options...
MORE Posted March 4, 2019 Author Report Share Posted March 4, 2019 mmm Do you have a scheme where is it visible, please? Quote Link to comment Share on other sites More sharing options...
mk2 Posted March 4, 2019 Report Share Posted March 4, 2019 I don't, but just follow the pipes... Quote Link to comment Share on other sites More sharing options...
MORE Posted March 4, 2019 Author Report Share Posted March 4, 2019 Oh... Poor me ... But... Thanks a lot for your support... Quote Link to comment Share on other sites More sharing options...
mk2 Posted March 5, 2019 Report Share Posted March 5, 2019 The sensor on the bulkhead behind the engine is easy to change. Or you can unplug it and see if there's a change. It is usually controlled (on manual ac cars) by the fan controller module. Quote Link to comment Share on other sites More sharing options...
MORE Posted March 5, 2019 Author Report Share Posted March 5, 2019 Following the pipes, the only two sensor that I saw are these... Quote Link to comment Share on other sites More sharing options...
Rich Posted March 5, 2019 Report Share Posted March 5, 2019 Neither. At the back of the engine bay, possibly hidden by the air box. Quote Link to comment Share on other sites More sharing options...
Rich Posted March 5, 2019 Report Share Posted March 5, 2019 Although you're lhd so Alvaro might have to confirm. Quote Link to comment Share on other sites More sharing options...
mk2 Posted March 5, 2019 Report Share Posted March 5, 2019 Silver aluminium pipe. Quote Link to comment Share on other sites More sharing options...
MORE Posted March 5, 2019 Author Report Share Posted March 5, 2019 That connected to the compressor? Quote Link to comment Share on other sites More sharing options...
MORE Posted March 10, 2019 Author Report Share Posted March 10, 2019 Hi Guys Unfortunally the problem is not solved, worst, I checked and another one came out. Read this sequence, please. I switched on the engine. I started the AC, so everything was ok, the fan started to run at 2nd speed, so I turned off AC. I wait until engine warm up, temperature near to 90°C, I connected the vag and I check those values, intake temp, cooling temp, air cond status. So, I verify the fan until it start up. First time it starts up at 98°C, more or less and stop at 84°C. Well, I verify the same with AC on, temperature increased, after a while AC disconnect the clutch, but at the threeshold (98°C) nothing happen to the fan, temperature continue to increase. I disconnect the fan plug, I verify if voltage was present, yes it was. I connected another time the fan, and immediatly fan running. I did same operation several times, and I notice that at the threeshold , only "pushing" a while the fan, it starts running. It seems that, with cold engine, 2nd speed it's ok, but at cold engine, fan has a problem to start by itself. Any idea, please? BR Quote Link to comment Share on other sites More sharing options...
MORE Posted March 15, 2019 Author Report Share Posted March 15, 2019 FIXED!!! Quote Link to comment Share on other sites More sharing options...
Rich Posted March 15, 2019 Report Share Posted March 15, 2019 Solution? Quote Link to comment Share on other sites More sharing options...
mk2 Posted March 15, 2019 Report Share Posted March 15, 2019 Yeah, what was the problem...? Quote Link to comment Share on other sites More sharing options...
MORE Posted March 17, 2019 Author Report Share Posted March 17, 2019 compressor clutch Quote Link to comment Share on other sites More sharing options...
mk2 Posted March 17, 2019 Report Share Posted March 17, 2019 The metal clutch disc slipping? Or the magnetic coil? Quote Link to comment Share on other sites More sharing options...
MORE Posted March 19, 2019 Author Report Share Posted March 19, 2019 coil Quote Link to comment Share on other sites More sharing options...
mk2 Posted March 19, 2019 Report Share Posted March 19, 2019 That's the question i asked on 4th march... is it switching on and off... answer = no. Aha! Quote Link to comment Share on other sites More sharing options...
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