BMW X4 Washer Nozzles Switching Between Frozen and Scalding

Hey there! I had almost identical symptoms with my 2011 BMW X3 last winter. The washer nozzle temperature going from one extreme to another is definitely a telltale sign of a faulty washer heater control module. When I took it to the garage, they found corroded wiring connections at the heater unit, plus the control module itself was shot. The technician mentioned this is actually a known issue with these systems. They had to replace both the control module and rewire the connections. It wasn't a complex fix, but the diagnosis process took some time to pinpoint the exact problem. It's not a critical safety issue, but I'd recommend getting it fixed soon because the temperature fluctuations can eventually damage other components in the washer system. The repair was pretty straightforward once they identified the problem. My car has been working perfectly fine since then, no temperature issues with the nozzles anymore. Hope this helps with your decision.

Thanks for sharing your experience! That sounds exactly like what I'm dealing with. I'm relieved to hear it was just the control module and wiring, was worried it might be something more serious. Would you mind telling me how much you ended up paying for the whole repair? Also, has everything stayed working properly since the fix? Just want to make sure I budget correctly and know what to expect long-term.

Hey again! Great to hear back from you! Just wanted to update you, I actually got mine fixed yesterday and it cost me 95 € for the repair. The mechanic found it was indeed just a faulty cable connection to the heater component, exactly like I suspected when I first replied to you. Much simpler than my initial repair where they had to replace the whole control module! Everything's working like a charm now, nozzles are spraying at perfect temperature, no more freezing or burning hot surprises. It's such a relief to have it working properly again. The car feels way more reliable now that this annoying issue is sorted. Since you asked about long-term reliability, after my first repair (the one I mentioned in my previous post), I never had any issues again until this recent minor cable problem. So once it's properly fixed, you shouldn't have to worry about it coming back. Just make sure you get a good mechanic who knows these BMW systems well, they can be a bit tricky if you don't know what to look for. Let me know how it goes with yours!

Thanks again for all the detailed info! Just got back from my mechanic visit today and wanted to update you. You were spot on, it was the heater control module. Had a fascinating experience though. Initially went to the dealership who quoted me an astronomical price, so I went to a specialist BMW shop instead. The tech there was super thorough, showed me the corroded wiring and explained everything. Ended up being way cheaper than expected, about half what the dealership quoted. They fixed both the module and rewired the connections in about two hours. Just tested it on my drive home and wow, what a difference! No more temperature swings, and the nozzles are working perfectly. Feels great to have this sorted without breaking the bank. Really appreciate your advice, helped me feel more confident about what to expect and what questions to ask. Think I've found my new go-to mechanic too. Funny how a broken washer system led to that! Thanks again for helping me figure this out.