Why does my rpm drop when I turn on my AC?
The idle speed initially drops because the A/C Compressor is driven by a belt connecting it to the crankshaft and requires some of the engine’s power to drive it. Most vehicles, however, have a mechanism to detect this rpm change under the A/C Compressor load and will bring the rpm back to normal.
When does RPM drop when a / C compressor engages?
The rpm drop only occurs when any A/C component is on (A/C, defroster, or re-circulation), when just the vent is on, the rpm does not drop and the engine run fines. Please help me with this question, it seems like this is not a one of a kind problem.
Why does my car turn off the AC at normal cruising rpm?
If your TPS is not not sensing the position of your throttle properly, it will definately turn off your AC at normal cruising RPM. My car does that when I am trying to floor the paddle but in normal mood, it keeps cooling even at 120+ km/hr.
Why does the engine stop cooling at 3000rpm?
The ” stops cooling at 3000rpm ” is exactly what @Anarach stated, in that the clutch disengages above this to allow more power to the engine. It could also do this so as to not over spin the A/C compressor. If you’re engine is hitting the 3000rpm at 100kph, this is probably the reason.
When does the a / C compressor engage, the engine stalls?
When the A/C compressor engages at idle in park or neutral every five to ten seconds the idle drops and will either almost stall the engine or occasionally does stall the engine. This happens in drive as well, and when driving, since the rpm’s drop and come back up, the vehicle surges at low speeds.
The rpm drop only occurs when any A/C component is on (A/C, defroster, or re-circulation), when just the vent is on, the rpm does not drop and the engine run fines. Please help me with this question, it seems like this is not a one of a kind problem.
What happens when engine RPM drops below 800?
However, when the engine RPM drops below the normal range of 800 RPM (for most cars), it is more than likely that you are dealing with an IAC valve problem. In cases where this valve is clogged or is failing, your vehicle will stall instead of slowing to an idle after the release of the throttle.
What causes rpm to jump back up at idle?
This then causes the RPM to jump back up again and then settle to a comfortable idle speed. You see the same thing to a lesser extent when turning on other systems on the car such as the heated rear screen. It’s most evident with the A/C compressor as this has is one of the biggest drains on the system in terms of additional equipment.
What causes the engine to slow down at idle?
What actually happens is that the A/C compressor clutch kicks in so that the drivebelt attached to the A/C compressor pulley wheel is then presented with the additional load required to rotate the compressor internals that circulate the refrigerant. This additional load placed on the engine causes the idle speed to slow down.