The first 95 degree day in Orange County is when everyone finds out their A/C isn't what it used to be. Usually it's not a surprise. The system has been dropping hints for weeks. Here are the signs worth paying attention to, what tends to cause them, and when to bring your Buick or GMC to our Certified Service center in Tustin before a long summer drive.
Is the air cold at first, then warms up?
This is the most common complaint we hear in June. The A/C blows cold for a few minutes, then turns cool, then just moves air around. That pattern often points to low refrigerant, and refrigerant doesn't get used up. If it's low, it leaked out somewhere. Topping it off without finding the leak is a short-term fix at best. A proper inspection looks for the leak first.
Is the airflow weak even on high?
If the fan sounds like it's working hard but not much comes out of the vents, start with the cabin air filter. After a spring of pollen and a few months of freeway dust, a clogged filter chokes airflow and makes the whole system work harder. It's one of the simplest things to check. If the filter is fine, the blower motor or a blend door could be the issue, and that takes a technician to diagnose.
Does it smell musty when you turn it on?
That damp, gym bag smell when the A/C kicks on usually means moisture is sitting in the evaporator housing and growing mildew. Running the fan without A/C for a minute before you shut the car off can help, but if the smell keeps coming back, have it looked at. A dirty cabin filter can add to it too.
Do you hear a click, rattle or grind when the A/C engages?
A quiet click when the compressor clutch engages is normal. Grinding, squealing or a rattle that starts only when the A/C is on is not. Those sounds can point to a compressor or clutch problem, and running the system in that state can turn a repair into a bigger one. If you hear it, turn the A/C off and get it inspected.
Is there water inside the car?
A puddle under the car on a hot day is normal. That's condensation draining the way it should. Water on the passenger floor mat is not normal. It usually means the drain line is clogged and the condensation is backing up into the cabin. It's an easy fix when caught early and a mold problem when it isn't.
What does an A/C check at Tustin Buick GMC include?
Our factory-trained GMC and Buick Certified Service technicians inspect the system for leaks, check refrigerant levels and pressures, test the compressor and cooling fan operation, and look at the cabin air filter and the condenser for debris. We use Genuine GM Parts and ACDelco components, so the parts match what came on your vehicle. Recommendations are based on what the inspection finds, not on a checklist.
Summer heat is also the number one thing that wears a battery down, and the problem tends to show up later. While you're in, a battery and charging system test is part of our Complimentary Multi-Point Vehicle Inspection. You can read more on our battery service page.
Frequently Asked Questions
Why does my A/C blow cold and then warm?
Often low refrigerant from a leak, though a failing compressor or a blend door problem can do the same thing. An inspection pins it down.
Can I just recharge the A/C myself?
A can from the parts store may make it cold for a while, but it doesn't fix the leak and it's easy to overcharge the system. We recommend having a technician find the cause first.
How often should the cabin air filter be changed?
Follow the interval in your owner's manual. In Orange County traffic and pollen season, it often needs attention sooner. Ask your advisor to check it at your next visit.
How long does an A/C inspection take?
It depends on what we find. We'll give you an estimate when you drop off, and you can schedule online for a time that works.
Get it checked before the heat peaks
Schedule service online or check our current service and parts coupons before you come in. The service department at Tustin Buick GMC is open Monday through Friday 7:00 AM to 6:00 PM and Saturday 8:00 AM to 3:00 PM at 1 Auto Center Dr in Tustin, serving Irvine, Santa Ana and all of Orange County. Get directions and hours.
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Disclaimer: Service recommendations are based on inspection findings. A/C system diagnosis and repair needs vary by vehicle and condition; see your owner's manual for maintenance intervals. Multi-Point Vehicle Inspections vary by participating dealer and are included with most service appointments. Offers subject to eligibility and expiration, see dealer for details.