Climate control unit malfunction - engine won't start

Hi everyone. I've already read many interesting posts, but I couldn't find a solution to my problem. My 1996 Vento was parked for a week after normal operation. After that, the Climatronic control unit occasionally stopped working, but sometimes it would start again if I pushed it from the side on the dashboard, right next to the unit. Now, it's completely dead; the control unit is not working at all! Which wouldn't bother me so much if my engine started normally... but it doesn't! At an outside temperature of 5 degrees Celsius, I'm using the windshield wipers for entire city blocks and have to let it run for 10 minutes before it starts, whereas it always started without any problems before. HELP!!!!!! 'The sunroof isn't working either. According to the wiring diagram, the Climate Control module also has a connection to the fuel injection system, as well as the sunroof, and other things. So, my question is: Would a new Climate Control module solve the problem, or could it be something else entirely? Does anyone happen to have a used control unit (1h0 907 044 A) lying around somewhere? Thanks in advance...Matze! P.S. Has anyone ever driven for three hours at zero degrees without any heating? You can't possibly wear enough clothes for that!' Please help!!!!

... according to the wiring diagram, the control unit for the Climatronic system also has a connection to the fuel injection system... Now, my question: Is it enough to just replace the control unit for the climate control system?

I really can't imagine that the climate control system is the cause of your starting problems.

Just give it some time and see if it starts up better – but as I said, it's very unlikely.

Has the error memory been read out before?

How does it smoke in the morning during the '10-minute start' or immediately after starting?

"I completely agree. There must be something else broken as well. You can disconnect the Climatronic control unit while the engine is running, and the car will still drive. Have you checked the compressor clutch to see if anything is stuck or corroded?" Can you rule out a loose connection at the connectors?

Hello,

1Z + White smoke during a bad start = check the screw for the timing belt pulley.
Unfortunately, I have no information about the climate control system.

Best regards, Rainer.

The main reason I suspect it's the control unit is that initially, a slight sideways tap next to the Climatronic control unit would sometimes help it restart completely, and the sunroof would also regain power. However, after a while, the system would be dead again. I've tried it with the built-in unit and without, and right now the car is sitting there looking like it's been through a car radio theft, because I've removed everything around the Climatronic control unit to check the connectors, all the cables, ground connections, condensation drainage, or anything else... but I haven't found anything wrong. 'I don't want to drive it anymore; it's pure torture for an engine that already has 200,000 kilometers on the (admittedly digital) odometer, and during the last preventative cylinder head gasket replacement, not a single scratch mark appeared on the cylinder walls. I almost rule out mechanical problems like the timing belt area, because the engine was completely overhauled just under 30,000 kilometers ago, and it was running perfectly fine before that one mysterious week, and it's running fine now, as long as it starts. I have to add that on the highway, the 'black smoke and power loss' syndrome occasionally occurs, but not always! When idling, the smoke is only white! What worries me is that, according to...' The wiring diagram shows the cable running towards the fuel injectors (hence the assumption), sunroof, etc. I've also ruled out damage from rodents; I've already thoroughly inspected every corner of the engine compartment and underneath. I'm starting to despair; he's usually such a well-behaved car. It would be helpful if I could install my climate control unit in a working vehicle and see if it's also dead there; that would be a good solution! But I'm stuck right in the middle of a village and I haven't been able to leave for a month now!!!

Hi,

I don't think it's related to the control panel.

If you hit the dashboard anywhere, the vibration travels everywhere. The cause could therefore be located ENTIRELY elsewhere.

Have you ever checked to see where the electricity is available and where it isn't?

To me, that sounds like a power outage. Try reversing the multimeter's polarity, for example, from the sunroof towards the fuse box, and check everything along the way.

I highly doubt that the issue lies with the relay 109. It would be surprising if it were responsible for something like climate control.

Or, try removing the climate control unit and see if you can get the rest of the system working again. As others have mentioned, the engine should also run without it.

Best regards,

Jan.

P.S.: So, while Berlin (which is listed as your place of residence) might have some rural aspects, I wouldn't exactly call it a village...

Hello everyone, my helpful assistants and idea generators. I just read the latest post, and the thought that a hit to the dashboard could cause a lot of things to 'shift' makes sense. I've just sent the current wiring diagrams to an electrician who should check the climate control unit. Therefore, I can't do any measuring this weekend, but I will definitely try that next. I've already done some preliminary analysis and identified some potential measurement points. I can also take a look at relay 109, just for fun! If anyone has any other ideas or a clever approach to solving this, I would still be grateful! Greetings...

PS: Hey Jan. I'm currently doing my mandatory, non-military service for the country in a town with only 11 residents, which is why I'm stuck here, damn it (You know, with a bus that only runs twice a day... grin!). Thank you.