It usually means that your system has developed a leak. Your AC system is charged with freon gas. If a certain amount leaks out, a safety device prevents the AC compressor from starting. Without the compressor, no cold air.
What do you mean by "has no heat"? No air blowing out, blowing out cold air when heater is on, blowing nothing at all? Heater not turning on? What specifically is happening?
This means your Jimmy is pregnant with a Jenny.
Is the AC condenser in your system blowing cold air?
If it stops blowing cold air then your clutch on the compressor is probably not any good, or it could be that you need to recharge your freon and lubricant
It's due to your car not having freon go and get it charged. The cold air is from you driving!
One reason is engine overheating - check your temp gauge and coolant as a first step.
if its blowing, but not blowing cold its low on coolant. it takes r134a.
There are a few reasons why a central air unit is not blowing cold air. The coils may be dirty, the unit may need freon, or the thermostat could be broken.
Replace Thermostat
when turning on air conditionor for cold air only get hot
blowing cool air, is the air only in your mouth... warm air comes from your lungs. temperature also varies by how open your mouth is while blowing air out
why does the fan still run on the unit after it cycles is over. but it is blowing hot air not cold