Why does my car idle up and down when AC is on?
A rough idle when the air conditioning is on may be caused by: A faulty or dirty IAC valve. A dirty throttle body. A faulty cooling or condenser fan.
Why is my AC fan not turning off?
The most common reason that your Air Conditioner fan won’t turn off is because a stuck relay keeping the circuit closed. If it’s not the relay, your thermostat likely has a shorted cable or needs to be replaced.
Why does my AC only work when idling?
AC Condenser Fan Is Defective A defective AC condenser fan is a possible reason why your AC only works when driving. When your car is in motion at top speeds, the condenser does not require the fan to cool the freon. As a result, the air conditioner does not work when your car is idle.
Is idling with AC on bad?
To answer your question having the AC ON while idling will hurt the engine if the engine can’t maintain a recommended operating temperature, no cold weather can stop an engine from overheating without a radiator system.
What do you do if your AC won’t turn off?
When Your AC Won’t Shut Off
- Check the Thermostat. You may find your thermostat not reaching the set air conditioning temperature.
- Clean the Condenser. Your AC works by passing air over condenser coils which remove the heat from the air.
- Have You Done Routine Maintenance?
- Check the Fan Limit Switch.
How long should fan run after AC turns off?
Your HVAC fan should turn on and off with the rest of your heating and cooling system. It’s normal for the fan to kick on a couple of minutes before heating starts or to stay on for a couple of minutes after cooling stops, but your fan shouldn’t run for hours on its own.
Why is my AC colder at idle?
At idle the pressure is lower, but when driving the pressure increases. If the compressor is shutting off, it could be a faulty pressure switch or too much refrigerant in the system or a plugged condensor. Changing the switch is easy. On most vehicles it is located by the drier.
Why does my truck lose power when the AC is on?
Your car has just under 150 horse power, the a/c compressor puts load on the engine when it is switched on. A lot of cars disable the compressor momentarily on hard acceleration so as to reduce the power loss and let you get horsepower when you need it.
Why does my car idle when the AC is on?
It also helps increase engine speed when an extra load is placed on the engine, for example, when you turn on the AC or defrost system. However, a faulty or restricted IAC valve may keep the engine idle speed from increasing when it needs to.
What to do if your air conditioner won’t turn off?
If everything is working correctly, the AC should turn off since it’s reached the desired temperature. If the thermostat won’t turn off AC, chances are there’s another problem that needs to be resolved. Clean the Condenser. Your AC works by passing air over condenser coils which remove the heat from the air.
Why does my AC thermostat not turn off?
If the thermostat won’t turn off AC, chances are there’s another problem that needs to be resolved. Your AC works by passing air over condenser coils which remove the heat from the air. If these condenser coils are dirty, they can’t cool air as effectively.
Why does my air conditioner keep running all the time?
However, if your AC is running continuously and never turning off, this isn’t normal and you likely have a problem with your air conditioner. Reasons your AC fan may be running continuously include: The fan is set to ON instead of AUTO; Thermostat is broken ; The outside temperature is high; A relay switch is broken; Short circuit