Table of Contents
Does AC affect engine rpm?
When the A/C is switched on the engine ecu increases the idle speed by a few hundred rpm to make sure the engine does not stall and keep a “smooth” idle. This is normal.
Why does my AC stop working at higher speeds?
The A/C thermal expansion valve (TXV) most likely is the cause of the A/C system freezing up at higher engine or vehicle speeds. The A/C system should be performance tested and checked for pressures to make sure the system has enough refrigerant or the TXV is the cause of the problems.
Does throttle body affect AC?
A dirty throttle body can also affect idle during AC operation. A throttle plate is calibrated to remain almost closed during idle, while the computer regulates airflow past the throttle plate. However, if the throttle plate and bore are dirty, insufficient air will flow and cause trouble when you turn on the AC.
What is the rpm of car AC compressor?
While maximum speed of the compressors of the 60’s and 701 was 6000 to 7000 rpm, modern rotary compressors are able to run up to 14,000 rpm.
Why does my car accelerate slower with the AC on?
Unless the car engine is sufficiently big, the energy required to run the AC becomes a significant part of the engine power. Therefore, less power is available to run the car. Hence the slow down.
Why does my car AC only work when I drive fast?
You could have a low system freon, When the engine is turning faster, the compressor can build up the pressure enough to have cool air out the vents. Or you might not have condenser fans working correctly not pulling cool ari across the condenser while slow or parked.
Why do my rpms fluctuate at idle with AC on?
It is common to see a small fluctuation in RPM when the AC turns off and on due to the drag on the engine. It should not drop that much though. It sounds like the idle control system is not functioning properly. Most of the time the fix is as simple as reprogramming the computer.
At what RPM should you check AC pressure?
Once you attach your gauges and start your engine, keep RPMs steady at around 1,200 to 1,500 RPM. Keep in mind that AC pressures and center duct temperatures are directly related to ambient temps and relative humidity. If your readings are outside the typical pressure/temperature range, see below.
Why does my RPM go up and down while AC is on?
Common reasons for this to happen: Carbon Buildup: A number of engine components are subject to carbon buildup over time, and this can place a significant load on the engine. When the additional load of your AC compressor is added, it causes the computer to miscalculate and increase idle speed too much.
How does the AC compressor work in a car?
The AC compressor is powered by your cars engine via a belt. It is engaged and disengaged as needed by an electro magnetic clutch. How long it stays engaged is determined by pressure switches in the refrigerant lines.
How do you calculate the speed of an AC motor?
Speed = 120 x frequency (Hz) / poles of the motor Example 120 x 60 hertz / 4 poles = 1,800 rpm. Keep in mind that the speed of an AC motor will not run at these exact numbers—and will be slightly lower—because there is a certain amount of slip that must be present for the motor to produce torque.
What happens to rpm when you press the accelerator?
Car engine rpm increases as you press the accelerator, as does power — at least to a point. An engine doesn’t necessarily produce its maximum power at its highest rpm. Engine specifications typically present the peak horsepower figure followed by the rpm at which it occurs, such as 252 hp at 5,600 rpm.
Does the fan speed setting affect the AC compressor?
It operates completely independently of the AC compressor. As far as the AC compressor is concerned, it’s either on, or off. Fan speed setting is irrelevant. The AC compressor is powered by your cars engine via a belt. It is engaged and disengaged as needed by an electro magnetic clutch.