What Causes the Sour Odor in Buick Regal?

[RonanDella]

Most unpleasant odors in vehicles are primarily caused by sound insulation cotton, vibration damping pads, and interior materials. Below is an introduction to the Buick Regal: 1. New Regal: The New Regal is a domestically produced vehicle launched by Shanghai GM, serving as one of the key components of Shanghai GM Buick's dual-brand strategy. It has a body weight of 1570 kg and adopts front-wheel drive. 2. Exterior: The design features full and smooth lines that interpret Buick's new design language, highlighting the New Regal's dynamic and tension-filled aesthetic appeal. Utilizing advanced aerodynamic principles, it achieves an ultra-low drag coefficient of 0.27, significantly enhancing driving efficiency, quietness, and comfort, thereby adding a sharper and more exhilarating driving experience.

[DeEsther]

Having driven a Buick Regal for over a decade, I've found that most sour odors originate from the AC system, particularly due to water accumulation in the evaporator box. After turning on the AC, the heat exchange process leaves moisture residue in the evaporator. Poor drainage leads to water buildup, creating a damp environment prone to bacterial and mold growth. As these microorganisms decompose dust and impurities, they produce that characteristic sour smell. Regular cleaning of AC ducts and replacing filters is crucial—don't wait until the odor becomes severe. I make it a habit to visit the repair shop for a pre-summer checkup, spending just a couple hundred bucks to address it. Long-term neglect can worsen the situation, potentially clogging ducts or even reducing blower efficiency, degrading cabin air quality—especially problematic for health-sensitive passengers like my allergy-prone child. Best practice: Turn off AC but keep fans running for a few minutes before shutting down the engine to maintain dryness and prevent mold formation.

[TimothyFitz]

When I first got my used Buick Regal, I noticed a sour smell whenever I turned on the AC. After some online research, I realized it was due to mold in the AC system. During operation, moisture accumulates on the evaporator, creating a breeding ground for bacteria that produce foul-smelling metabolites. My DIY fix: I bought an AC cleaning spray, followed the instructions to spray it into the air vents, let it sit for 10 minutes, then ran the fan to dry it out—the smell almost disappeared. Replacing the cabin air filter for just a few bucks made it even better. Daily tip: avoid shutting off the engine directly in humid weather; switch to outside air circulation before parking to prevent moisture buildup. Car maintenance is no big deal—it saves hassle and money, plus makes driving more comfortable. Now I clean it quarterly, and it's been problem-free.

[PenelopeAnn]

The sour odor in Buick Regal often originates from the air conditioning system, where the structural design of the evaporator box tends to trap moisture. During AC cooling, condensation forms on the evaporator surface. If the drain hole is clogged or the system isn't properly sealed, stagnant water promotes bacterial growth, with metabolic byproducts like acetic acid emitting the sour smell. Regularly cleaning the evaporator pipes and using antibacterial sprays can eliminate mold, while maintaining clean filters to prevent dust buildup is also crucial. From a technical perspective, optimizing usage habits—such as turning off cooling early to let the blower dry residual moisture—can prevent recurrence, ensuring a fresh cabin environment.