Troubleshoot A/C Blowing Warm Air

like max a/c? Does it blow cold when in the middle of the cold or just a couple clicks from the end? CURRENTLY WORKING ON A RIDGE WITH A/ ... 4 Reasons Your Car A/C May Be Blowing Hot Air · 1. DIRTY CABIN AIR FILTER · 2. REFRIGERANT LEAK · 3. CLOGGED EXPANSION VALVE · 4. FAULTY BLOWER ... Your A/C system could blow warm air if the outdoor unit loses power but the indoor one doesn't. The unit could have lost power due to a tripped circuit breaker ... If it turns from cold to hot, check your freon and any leaks. Change your AC cabin filter. Maybe switch the temp to from cold to hot then back ... You probably have an evaporator leaking. If you have rear AC you have 2 evaporators. They can both be leaking, The rear AC is easy to see. One of the main reasons that an air conditioner will blow lukewarm air is that the air filter is clogged. It goes through for 3-4 hours blowing cold air, then suddenly it blows warm (or more like room temp) air out and obviously isn't cooling. Flushing thru the expansion valve is bad - so only flush thru the valve you're about to replace anyway. ... Once flushed, blown out and given time ... We took the time to highlight a few of the biggest reasons why this happens as well as how you can fix them. There are many reasons why you're getting a hot air blast from your home's A/C, ranging from quick fixes to repairs that might require a call to Ernst Heating ...