A/C blows cold and strong for 15 minutes and then blows cold and very weak until I turn off the car?

2008 HONDA CIVIC
140,000 MILES • 1.8L • 4 CYL • 2WD • AUTOMATIC
Avatar
LUKECHACKO
  • MEMBER
  • 1 POST
When I start up my car, the A/C is blowing cold air very strongly and has no issues with air flow. After about 5-15 minutes of driving the air flow will nosedive to almost no air flow even at the highest fan setting. I will feel just a tiny bit of cold air flowing out at the highest fan setting and it will remain like this until I shut the car off for twenty or so minutes and then it will repeat the same cycle. The cabin air filter is clean, air line PSI is optimal. I don't know the next step to check after this.
Jul 27, 2023 at 6:27 AM
Advertisement
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,249 POSTS
So, what happens is if the A/C system is just a little low on refrigerant the low side pressure drops too low and ices up the evaporator which restricts the air flow. I would add a small amount of refrigerant to see if that fixes the problem. Please watch this video to help you get the pressures correct:

https://youtu.be/4EqdrBVb0sY

And please go over this guide:

https://www.2carpros.com/articles/comprehensive-guide-troubleshooting-intermittent-automotive-air-conditioner-problems

Please go over these guides and get back to us.


Jul 28, 2023 at 4:53 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.