What Causes the Buick Excelle's Air Conditioning to Alternate Between Hot and Cold?
3 Answers
The reasons for the Buick Excelle's air conditioning alternating between hot and cold are as follows: 1. Lack of Freon: It is necessary to check if there is a leak somewhere. The solution is to drip some water at the car's pipe joints; the leaking area will usually produce bubbles. Once the leak is found, it can be repaired, or you can go to a repair shop or maintenance shop to add Freon. 2. Dirty Filter: Locate the bypass valve on the filter base. When the pressure difference on both sides of the valve reaches a certain value, it can be opened. Generally, engine oil flows into the main oil pipeline through this pipe. Use automotive-specific lubricant to lubricate other related components. 3. Insufficient Antifreeze: You should immediately go to the nearest 4S store for repair. 4. Aging Air Conditioning Core: If the car's air conditioning core has been used for a long time, it may be faulty, and you should immediately go to the nearest 4S store for repair.
I've driven several Buick models, including the Excelle. If the air conditioning fluctuates between hot and cold, the most common cause is a leak in the refrigeration system, leading to insufficient refrigerant. This causes the compressor to work intermittently, disrupting temperature control. Additionally, the air conditioning thermostat might be malfunctioning, inaccurately sensing the cabin temperature and turning on and off sporadically. Compressor failure or unstable evaporator fan operation can also cause this, especially in compact cars like the Excelle. I recommend first checking the refrigerant pressure and compressor condition. If there's a leak, you'll need to recharge the refrigerant. A clogged cabin air filter affecting airflow should also be cleaned. Regular maintenance is crucial, otherwise driving in summer becomes unbearable, affecting both comfort and safety.
I also encountered the issue of the air conditioning blowing hot and cold intermittently. My Excelle had this problem where the cold air suddenly turned hot while driving on the highway, which was really annoying. Later, I found out it was due to the aging of the evaporator temperature sensor, causing inaccurate data and the system switching modes randomly. There was also poor contact with the control buttons, making the AUTO button unstable. Check if the fuse is blown or if there are loose wires—the electrical system in the Excelle sometimes acts up. Adding refrigerant helped a lot, but for the long term, I recommend going to a professional shop for a comprehensive test of the AC module. Unstable AC not only wastes fuel but also distracts you while driving, increasing the risk of accidents.
