What controls idle when AC is on?
The IAC valve controls the engine idle, depending on the load enforced on the car engine. For instance, if the IAC valve fails to move to the ideal position for the load the AC compressor enforces on the engine while at idle, the car stalls.
Do cars idle higher with AC on?
The extra air enriches the air-fuel mixture during a cold engine start. 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.
Is it bad to have AC on while idle?
It’s not a great practice. But setting my environmental preferences aside, you can let any car idle with the AC on for a long time without doing any harm. As long as the cooling system is working properly, you should be able to sit in any modern car you buy and let it idle indefinitely.
Is sitting in your car with the AC on bad?
So, if you leave your car AC running for hours without the car being in motion, you run the risk of damaging your car’s battery. The engine can also overheat, causing damage to the radiator if left for an extended period running without movement. The car’s fans work as coolants when it is in motion.
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’s the best way to idle a car?
Run the engine until it reaches normal operating temperature. Allow engine to idle for at least one minute. Turn the air conditioning on and allow the engine to idle for at least one minute. Release the parking brake.
How can I increase idle speed in a Chrysler?
If the resistance is outside that range, the idle control motor needs to be replaced. Use a bidirectional scan tool to increase idle speed in a Chrysler. Connect a bidirectional scan tool to the same OBD port you would plug a code scanner into. Use the command in the scan tool to increase the engine’s idle.
What does it mean when idle control does not increase?
If the engine idle does not increase, it means there is an issue at the idle control motor of its circuit preventing the signal from changing the idle. You can purchase a bidirectional scan tool at your local auto parts store. Make sure the wiring harness is firmly connected to the idle control motor before conducting this test.