Operating range of heated was he jets

[Crash513]

Another cold weather use question. I' 've been driving my X5 in extremely cold mountain conditions and parking it overnight in heavy snowfall for the last several days. Each morning when I've dug the car out and started it, I have not been able to get the windshield washers to function. The temperature at the time I have done this is between 14 to 16° f (-10 to - 9° c), which seems to me should be within their operating range.

Each time I have had this happen, I have cleared accumulated snow from the cowl, and even tried rinsing the nozzles once directly with anti-freeze washer fluid. I' m allowing 10 minutes or more of warm-up time, which seems to be enough to get the defrosted working well,and the interior warm. I can hear the pump motor running, and the reservoir is full.

Am I reasonable to expect the washers to heat up Brighton be useful at this temperature? Any ideas on what I can check to correct this? Any insights would be appreciated before I revert to my dealer.

Thanks