Browse

Property For Sale Property For Rent

Used Cars Others

Antiques Collectibles Apparel Baby Kids Items Books， Movies And Music Electronics Free Stuff Garden Outdoor Health Beauty Home Goods Home Improvement Supplies Musical Instruments Office Supplies Others Pet Supplies Sporting Goods Ticket Toys Games Transportation

Business Crafts Design And Web Events Home Improvement Legal Lessons Personal Pets Photography Repair And Technical Support Wellness Writing， Translation， And Transcription Others

Activities & Groups Artists & Musicians Classes & Lessons Events Friendship & Networking Lost & Found Rideshare Sports Teams Volunteers Travel & Travel Partners Skills & Language Swap Other

Why does the car idle unstably when the air conditioner is on?

1 Answers

LeKing

09/04/25 7:04am

When the air conditioner is on and the idle is unstable, the following reasons may be the cause: 1. The engine control logic is faulty and cannot receive the signal that the air conditioner is turned on: When it cannot determine whether the air conditioner is on, the engine control unit (ECU) mistakenly assumes it is a temporary high load and attempts to compensate for the resistance at idle by increasing the speed. When the engine speed drops, it cannot handle the load of the air conditioner compressor and increases the speed again. This back-and-forth results in unstable idle. 2. The air conditioner control circuit is faulty and cannot send the signal that the air conditioner is on: Similar to the first reason, because it cannot determine the air conditioner's operating status, the ECU continuously adjusts the idle speed, leading to unstable idle. 3. The air conditioner circuit is faulty, causing the air conditioner to work intermittently: When the air conditioner is not working, the air conditioner compressor belt runs without load, so it does not affect the engine load. The intermittent operation of the air conditioner compressor causes the engine to continuously adjust the idle speed, resulting in unstable idle.

Was this review help?

16

3

Share

More Forum Discussions

Why is the Lexus IS more expensive than the ES?

Lexus IS is more expensive than the ES mainly for the following reasons: 1. The structure from the C-pillar to the roof side has been optimized, and points have been added to the front side members to enhance body rigidity, improve sporty performance, and reduce noise and vibration. 2. The new 2.0-liter inline 4-cylinder gasoline turbocharger is equipped with an adaptive control function that judges the driving environment based on throttle opening and selects the appropriate gear according to the situation. 3. The lane recognition performance of the steering assist system "Lane Tracing Assist (LTA)" has been improved. During operation, AI technology is used by the camera for white line recognition, and the vehicle decelerates in advance based on the size of the curve. Additionally, adjustments can be made to maintain a constant lateral position when driving through curves.

How to Deal with Overheating Engine?

When the engine temperature is too high, the water temperature warning light on the vehicle's dashboard will illuminate, and sometimes white smoke may appear from the engine compartment. In such cases, follow these steps: 1. Find a safe place to pull over and let the vehicle idle; do not turn off the engine, as stopping the engine will halt the cooling fan and coolant circulation, which can cause the engine to become even hotter. 2. Open the hood to increase airflow and allow the water temperature to drop. Then, slightly loosen the radiator cap to release internal steam before fully opening it. 3. Do not immediately add coolant. Due to thermal expansion, boiling water in a sealed container creates pressure. If the radiator cap is opened immediately after boiling, the internal pressure may cause hot water to spray out, potentially causing burns. 4. Check for leaks in the radiator hoses and verify if the coolant level is sufficient. If needed, you can temporarily use bottled water as a substitute.

How to Use the Voice Control in Geely Boyue?

Geely Boyue's voice control usage method: Start the vehicle and directly input commands. After speaking the relevant instructions, the system will automatically execute them with a 1-2 second delay, which is quite convenient. The voice functions of Geely Boyue include regular wake-up, customized wake-up, and speaker selection. The Boyue is a model under Geely Auto, with dimensions of 4519mm in length, 1831mm in width, and 1694mm in height, a wheelbase of 2670mm, and a fuel tank capacity of 58 liters. In terms of exterior design, the front face of Geely Boyue adopts Geely's family-style "water ripple" grille. Considering the SUV's sense of power, designers reduced the number of grids, making the overall appearance more concise with sharper edges.

How to Start the Vehicle When the Baojun 560 Key Fob Battery Dies?

Baojun 560 key fob battery dies can use the mechanical key to start the vehicle. The operation method is: pull out the mechanical key from the smart key to open the door, after entering the compartment, press the side of the key with the Baojun logo against the one-button start button, then press the one-button start button to start the engine. The Baojun 560 is the first SUV model under the Baojun brand. In terms of body size, its length, width and height are 4620mm, 1820mm and 1750mm respectively, and the wheelbase is 2750mm. In terms of appearance, the front part of the Baojun 560 continues the Baojun family-style design, with the chrome grille, headlight outline and engine hood feature lines all similar to the Baojun 730; the LED daytime running lights are located below the fog lights, and the headlights are also equipped with LED position lights.

Where is the Audi oil dipstick located?

Audi oil dipstick is located next to the engine. The oil dipstick is generally positioned near the engine, either on top or on the side. A distinctive feature of the dipstick is that it has a pull ring, making it easily identifiable. Method for checking the oil dipstick: 1. Pull out the oil dipstick. Note: To check the oil level, the vehicle must be cooled down. If you've just driven the car or the engine is running, checking at this time won't be accurate. 2. Clean the oil residue. After pulling out the dipstick for the first time, wipe it clean with a tissue, then reinsert it. Upon pulling it out a second time, you can check the oil level on the dipstick. 3. If the oil level is between the upper and lower limits, it indicates a normal oil level. The so-called upper and lower limits are usually marked with scales, making them clearly visible.

Why is there a large gap between the car window glass and the rubber seal?

The reasons for a large gap between the car window glass and the rubber seal are: 1. Check the window regulator of the glass door. Long-term opening and closing of the glass door can cause the regulator screws to loosen. If they are loose, tighten them; 2. If the window regulator is worn or broken, and the handle cannot be turned, the regulator may be faulty. It is recommended to replace the regulator; 3. If the glass door is electronically controlled, a broken motor gear or poor circuit contact can cause the glass door to not close tightly, resulting in a larger gap. Car windows are the windows set in the four walls of the compartment. The front and rear windows of a car usually use curved glass that is both aesthetically pleasing and conducive to visibility. They are embedded in the window frame with rubber seals or attached to the frame with special adhesives.

Trending Ranking

What to Do When a Ford Car Shows High Engine Temperature?

How to Check if the Engine Oil is Sufficient?

How to fold down the rear seats of a 2014 Corolla?

What is the ground clearance of the 14th-generation Sylphy?

What are the specifications and dimensions of the Volvo XC60?

How early can the vehicle annual inspection sticker be obtained?

Where is the cabin air filter located in the Dongfeng Fengxing X3?

Will Washing the Car Remove the Wax?

How is the early vehicle inspection date calculated?

What type of engine oil is suitable for Geely Borui 1.8T?

More Forum Discussions

What Causes Turbocharger Oil Leaks?

How to siphon gasoline from a car fuel tank?

Operating Steps for Using a Vernier Caliper

What is the main purpose of crankcase ventilation?

Help

Cookie

Cookie Settings

© 2025 Servanan International Pte. Ltd.