Sandgrounder: normally, it's not that cold around here in dallas,tx.- it went from 80 degrees during the day to 20 degrees that night- strange weather- anyway the temp gauge showed 27 degrees hat morning and the windshield wipers/fliud worked fine. Since then, actually that afternoon after it warmed up a bit, I went out to the car and the air/heater has been working fine since- so, I will check out the the things you said- anti-freeze or maybe some water froze up somehwere and blocked something- it actually wasn't that cold here, now that I'm comparing it to where you live!