1999 Audi A4 AC not cooling

11,700 MILES • 4 CYL • 2WD • AUTOMATIC
Avatar
KLBRATTON
  • MEMBER
  • 2 POSTS
My AC cools sometimes and does not sometimes. When it is cooling - it is very cold, but when I stop in traffic or sometimes while on the interstate it will automatically switch to "Econo" and the air is warm. When the air stops cooling, sometimes if you stop and turn the engine off and leave it for just a minute and restart, the air comes on and is ice cold. There is no set time it is not cold or warm. It may go all day and stay cold, or it may be cold, then go to "econo", then I switch off econo, and it may get cold again. I am going crazy with this thing and not sure if it is electrical or ac, so not sure who to talk to about it.
Jun 24, 2010 at 2:57 PM
Advertisement
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Could be the A/C system is freezing up due to air and moisture forming ice and blocking off the orifice tube.I recommend you have it vacuumed.
Jun 24, 2010 at 3:49 PM
Avatar
KLBRATTON
  • MEMBER
  • 2 POSTS
Thanks for your response. When I first realized I had a problem I took my car to the shop. They said the freeon was low, charged it and vacuumed the ac. So, according to that shop they did it. What would your next thought be? Someone has suggested that it could be the control head or temp sensor. Does it sound like one of these could be the problem? Thanks for your help.
Jun 25, 2010 at 3:54 PM
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Could be the control head or the temperature sensor.
Jun 25, 2010 at 4:49 PM
Add a reply
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.

Frequently Asked Problems for This Vehicle