Why did my air conditioner stop blowing cold air? Like a full-size hvac unit, a window air conditioner relies on ample airflow throughout the system to function properly. Its always in the middle of. · dont panic if your ac turns on but doesn t blow cold air , theres a number of explanations why, and also solutions you can try. Here are some simple steps to troubleshoot the issue, and possibly get up and running without a repair call! You may be able to fix the unit yourself by following the troubleshooting steps in this guide. · summer temperatures are climbing, but if your ac is pushing out warm air instead of a chill breeze, these quick fixes can help bring back the cold air you need. But you don’t have to let a malfunctioning unit ruin your comfort in hot weather. · if you have a window air conditioner that doesn ’ t blow cold air , you’re not alone. Why is my window ac not blowing cold air? Why does my window ac not turn on? · window ac not blowing cold air ? · below, weve laid out some common reasons a window ac may not blow cold air , plus some troubleshooting tips for fixing the problem yourself.