marchena

Hello! I would try to provoke the symptoms by slowly pressing and depressing the clutch in neutral and 1st/2nd gear. You can also listen to the engine/flywheel area while starting/stopping the engine in neutral both with the clutch pressed in and released. These tests should be able to give you an idea if the sounds come from the dual mass flywheel or not, but you may have to seek out an experienced ear. When slowly engaging the clutch in neutral there is not a lot of resistance for the flywheel, so if it is very worn you could be able to hear some clattering. I had a bad clattering sound when doing this, and it went away with a new DMF. I also felt that the clutch pedal was kicking back when starting up in a steep hill. That is also gone with a new DMF… you could try that as well Keep in mind that a DMF’s nature is a bit «wobbly» in order to absorb the vibrations from the engine on lower RPMs… good luck!

Solved New fan assembly with both fans did the trick. I think the main fan with the integrated fan control module was the fix.

Crazy as it is, the guy I rented the RossTech from had a new complete fan assembly in his garage. I bought it. I am going to try and swap it out. Here are the error codes related to the coolant fan control 005746 - Coolant Fan Control 1 P1672 - 000 - Open or Short to Ground - Intermittent Freeze Frame: Fault Status: 00100000 Fault Priority: 3 Fault Frequency: 71 Reset counter: 255 Mileage: 240260 km Time Indication: 0 Date: 2000.00.00 Time: 16:59:51 Freeze Frame: RPM: 1197 /min Speed: 62.0 km/h Load: 29.4 % Voltage: 14.52 V Bin. Bits: 00101000 Temperature: 80.1°C Duty Cycle: 9.7 % 006469 - Control Module 1 for Cooling Fan P1945 - 000 - Output Short Circuit - Intermittent Freeze Frame: Fault Status: 00100000 Fault Priority: 3 Fault Frequency: 1 Reset counter: 255 Mileage: 240275 km Time Indication: 0 Date: 2000.00.00 Time: 10:50:02 Freeze Frame: RPM: 819 /min Speed: 0.0 km/h Load: 0.0 % Voltage: 13.98 V Bin. Bits: 00101000 Temperature: 54.9°C Duty Cycle: 9.7 % 006470 - Control Module 1 for Coolant Fan P1946 - 000 - Defective - Intermittent Freeze Frame: Fault Status: 00100000 Fault Priority: 3 Fault Frequency: 8 Reset counter: 255 Mileage: 240301 km Time Indication: 0 Date: 2000.00.00 Freeze Frame: RPM: 1659 /min Speed: 87.0 km/h Load: 10.2 % Voltage: 14.44 V Bin. Bits: 00101000 Temperature: 77.4°C Duty Cycle: 9.7 %

The engine output test is able to start the radiator fan. Reading the measuring blocks in the HVAC module everything seems fine, and it tells the radiator fan to go at a speed between 0 and 100%. I only tested it up to about 70% because I didnt wanna run the compressor and condenser too hot. Could it be that the output test is 100% fan speed, and bypasses the fan control module? See attached pdf files. See the errors related to the fan control module. aUTO SCAN.pdf engine codes.pdf

I'll do that!

Also: Both shops (The one that did the regas and another VAG garage on the phone) I have been talking to has generally suggested there may be a sensor, or temperature sensor messing about... (Lots of help)

Thank you for the reply, Wino. My research has shown the same description of the system as you describe. This is why I thought something was wrong with the pressure earlier, but seems like it is something wrong about the information about pressure as you say. Do you have access to a wiring diagram? I think I have seen one you posted in another thread. The wiring to the G65 sensor is accessible, so I will check that out. Could even try the old G65 sensor... I need to get my hands on VCDS to do the monitoring you mention. Deep regrets for not ordering Ross-Tech equipment a few months ago now. I'm not sure which module the garage used to activate the radiator fans, but I have been thinking the same.

I have the double fan setup where the Fan Control module is integrated in the main fan J7. The smaller fan is a slave off the main fan J35. Anyone know if the Fan Control Module or one of the fans could be faulty even if the fans are operable if they are forced on via diagnostics? The fans and the fan shroud is similar to this: https://m.autodoc.co.uk/tyc/7489544

Hello everyone, I have a Octavia Scout 2007 BMM engine that has a new compressor, G65 sensor, condenser and expansion valve. Today it was in for a vacuum and regas. The garage told me it was blowing cold air for 10 seconds and then no more. The condenser gets extremely hot and the fans are not turning on. The fans did however turn on and the AC worked fine when they forced the fans to run via diagnostic equipment. They did find the fault code P01274 - but they dont know of this is related to the Condenser Fan(s) not turning on. They suggested I could maybe wire in a switch to manually turn on the condenser fans to get the AC working, but I'd rather find out what is wrong, and I'm not even sure this would work. Some history: I have also seen the fans running after I changed the high pressure N65 sensor and regulating valve on the old compressor and recharged the system with a DIY gas. This was in a cool evening, and the AC worked. The day after, when it was pretty warm outside, the fans did not run and the compressor pressure relief valve blew. It gets very hot and high pressure when the fans are not running. After this I decided to replace the compressor, condenser and expansion valve because I thought there was something wrong with the pressure not engaging the fans via the N65 sensor, but it seems like the fan operation is the problem, or atleast part of it. After a lot of stupid decisions (should have gone straight to a dealer with proper AC gauges and diagnostic equipment first) I now believe something is wrong with either the fans or the electrical system before the fans. I am posting here while still having troubleshooting left to do - but with limited time available before a road trip through Europe I decided to post here and see if someone can point me the right direction. Grateful for any comments or replies. Regards, U