Audi RSQ3 Washer Fluid Freeze Issue After Service

Had a similar issue with my 2016 Audi RS3 last winter. The problem was not actually frozen washer fluid, but rather a combination of clogged nozzles and a faulty electrical connection to the windshield heating element. The fault showed up on the diagnostic scan as a heating circuit error. Initial checks at the workshop revealed the wiring harness near the windshield heater control module had worn through due to vibration. The cable insulation was damaged where it passes through the firewall, causing intermittent connection issues. The repair required accessing the fuse box area and replacing the damaged wiring section. While doing this, the technician also cleared the clogged washer nozzles, which were restricting fluid flow and contributing to the freezing impression. This was a serious issue since water ingress through the damaged cable could have caused more extensive electrical problems if left unaddressed. The windshield wipers also showed inconsistent performance due to the system thinking the glass was still frozen. Worth checking the connections and having a professional diagnostic scan to pinpoint whether your issue stems from actual frozen fluid or an electrical fault in the heating system.

Thanks for explaining your repair process. This sounds very similar to my RSQ3 situation. I just got the washer heater and wiring replaced last month due to the same symptoms. The windshield wipers were acting strangely too. Just wondering, do you remember roughly how much the repair ended up costing? Also, has everything worked properly since the fix? I am a bit concerned about potential issues when winter comes around again.

Following up on your questions, glad to report the repair has been completely successful since getting it fixed. The windshield washer fluid flows perfectly now, even in freezing conditions, and the windshield heater functions as intended. Not a single issue with the system since the repair was completed. The total repair cost in my case was 95 Euro, which covered fixing the faulty cable connection near the fuse box. This price was reasonable considering the technical nature of accessing and repairing the electrical components. For peace of mind regarding next winter: suggest keeping the washer fluid reservoir topped up with winter-grade fluid and occasionally running the system to prevent clogged nozzles. The windshield wipers should now maintain consistent performance since the heating system is properly connected. This tends to be a one-time fix as long as the repair is done properly, the new wiring should be better protected against wear and vibration damage than the original setup.

Thanks for the information. I took my RSQ3 to the dealer after seeing your reply. The diagnosis confirmed exactly what you described, a wiring issue near the washer heater control module. The repair cost me 120 Euro including parts and labor. The mechanic showed me where the cable insulation had worn through, causing the system malfunction. They also cleaned the clogged nozzles while working on it. Been testing it for a week now in cold mornings. The windshield wipers work perfectly and the washer fluid flows without freezing. Really glad I got this fixed before winter hits. The mechanic mentioned this is a known issue in some models and the updated wiring setup should prevent it from happening again. The diagnostic error code has cleared and hasnt come back. Big relief to have this sorted out. Thanks again for pointing me in the right direction with this repair.