Why is my AC not working in my 2015 Chevy Trax?

[LaAlaina]

The most likely causes for a 2015 Chevy Trax AC failure are a burned-out blower motor resistor and wiring harness (causing no airflow) or a refrigerant leak from the AC discharge hose (causing warm air). Less common issues involve a faulty HVAC control module or a compressor clutch not engaging. Immediate troubleshooting should focus on these specific, well-documented failure points.

A systematic approach is key. Start by checking if the cabin fan works. If there's no airflow at any speed, the problem is almost certainly electrical, centered on the blower motor circuit. If the fan blows air but it's not cold, the issue is within the refrigerant system.

Common 2015 Chevy Trax AC Failures & Repair Focus:

Failure Point	Symptom	Typical Repair Cost (Parts Only)	Notes
Blower Motor Resistor & Harness	Fan doesn't work, or only works on the highest speed.	$25 - $180	This is the most frequent failure. The harness connector often melts due to resistor overheating.
AC Discharge Hose Leak	Airflow is normal, but air is not cold.	$50 - $150	A common leak point. The entire hose assembly typically needs replacement.
HVAC Control Module / Cable	Inability to adjust temperature or airflow mode.	$100 - $300	A faulty blend door actuator or cable prevents proper temperature mixing.
AC Compressor Clutch	No cold air; clutch does not engage when AC is turned on.	$200 - $500	Often a result of low refrigerant (from a leak) or a failed pressure switch/relay.

For a complete fan failure, the integrated solution is to replace the blower motor resistor, the blower motor itself, and the wiring harness as a set. This addresses the root cause of the overload that melts the connector. Market data from repair forums and parts databases indicates that addressing these components together prevents near-term recurrence.

If the fan runs but the air is warm, the primary suspect is a refrigerant leak. The AC discharge hose, which runs from the compressor to the condenser, is a known failure point on this model. A professional diagnosis will involve a leak test and a system pressure check. Simply recharging the refrigerant without fixing the leak is a temporary fix that will fail again, typically within a few weeks or months.

While less frequent, a malfunctioning HVAC control module or a detached blend door cable can also mimic AC problems by preventing proper temperature regulation. Visual inspection behind the control panel can sometimes reveal this issue. Finally, always verify the serpentine belt is intact and that the compressor clutch is receiving power and engaging when the AC is switched on.

[SanBenjamin]

I just went through this with my own 2015 Trax. The fan completely died one day. I did some digging online in owner forums, and everyone pointed to the blower motor resistor and its wiring harness. I opened up the panel under the passenger-side dash, and sure enough, the plastic connector on the harness was melted and crispy. It’s a super common flaw. I ordered a new resistor and harness kit for about $65 and replaced both in under an hour. The fan’s worked perfectly ever since. If your air has stopped blowing, check that first before you panic.

[DelGideon]

As a mechanic who sees a few of these each summer, the 2015 Trax has a couple of predictable failures. When an owner tells me "the air doesn't blow," my first stop is the blower motor resistor harness under the glove box. The design causes it to overheat and melt the connector. For "blows but not cold," I immediately pressure test the system. Nine times out of ten, I find a leak at the discharge hose connections. The factory hose seals seem to degrade prematurely. My advice is to not just keep adding refrigerant. Find and fix that leak, usually the hose assembly, or you'll be back in my shop in a month. The compressor itself is fairly robust on these, but it won't engage if the refrigerant pressure is low due to a leak.

[ChristopherFitz]

Here’s a simple priority list based on symptoms:

• No air from vents? Focus on the electrical system. The blower motor resistor and its wiring harness are the prime suspects. This is a DIY-friendly fix.
• Air is blowing but it's warm? Your refrigerant is low, almost certainly due to a leak. The most common leak location is the AC discharge hose. This usually requires a professional for proper evacuation, repair, and recharge.
• Can’t change temperature or where the air comes from? The issue might be with the HVAC control head or a blend door actuator behind the dashboard. Start with the simplest checks: listen for the compressor clutch clicking on when the AC is activated, and visually inspect the fuse for the blower motor.

[VonVictoria]

We’ve owned our Trax since new, and the AC problem hit us around year seven. Initially, the fan would only work on the highest setting, then it quit entirely. I was worried it was a major, expensive repair. After researching, I learned this is a widespread issue with a known fix. I’m not a car expert, but I followed a detailed video guide. Purchasing a combined resistor and harness kit was the key—the new harness has improved connectors that are less prone to melting. The repair was straightforward: remove the old, melted parts and plug in the new ones. The relief when the fan kicked back on was huge. It’s been two summers with no trouble. My takeaway for other owners is this specific problem is almost a maintenance item for this model. Tackle it yourself with a $60 part and some patience, or know exactly what to tell your mechanic to save on diagnostic time.