Why does my engine stall when I turn on the AC?
Why does my engine stall when I turn on the AC?
Like many parts of your vehicle, the air conditioning system takes its power from the engine. It’s understandable that due to this, there may be significant pressure on the engine. More specifically, it may be too low to run the A/C and hence it stalls when turned on.
What happens when you use an A / C compressor?
You’ll always see a decrease in performance and fuel economy when you engage the A/C compressor. As Paulo540 noted, it increases the drag on the engine. Some systems increase the power output to compensate, older systems do not.
What happens when the AC compressor and clutch engage?
In most cases, when the AC compressor and clutch engage, it will draw extra ’power’ from the engine and cause the idle to slightly drop. However, this can cause existing issues to be amplified.
What happens when the compressor on a car breaks?
The clutch on the compressor is what allows the pulley to engage and disengage from engine power so that the compressor is only turning when it needs to be. The clutch keeps the compressor activated, if it breaks, the compressor will not be able to receive the engine power anymore.
When to drop power to the AC compressor?
This is usually done by temporarily dropping power to the AC compressor clutch whenever the throttle is opened to the point of hitting the transmission downshift point for a car equipped with an automatic transmission, or about 60% of full throttle opening on car with a manual transmission.
You’ll always see a decrease in performance and fuel economy when you engage the A/C compressor. As Paulo540 noted, it increases the drag on the engine. Some systems increase the power output to compensate, older systems do not.
Is an AC compressor supposed to spin with the engine off?
Hi All, we have a 2004 Ford Freestar (3.9L with rear ac controls) and the ac went out over a year ago. The tech at the ac place we just took it to at first said there wasn’t anything wrong with the compressor and then said there was, The tech said the compressor spins freely and there is no resistance when he spun the pulley with the engine off?
In most cases, when the AC compressor and clutch engage, it will draw extra ’power’ from the engine and cause the idle to slightly drop. However, this can cause existing issues to be amplified.
Why does the AC draw power from the engine?
Because the system is powered by your engine, it pulls energy from it during operation, which can have an effect on engine performance. You’ve likely noticed your car’s engine RPMs increasing at idle when the compressor kicks on.
