Whenever I turn on my air to cool, within 5 minutes, the check engine light comes on. If I turn the air off, the check engine light will go off in 10 minutes. What could the problem be? This is Texas, I need to turn the air on. It is 04 TL blk over 120K miles on it.

 

for starters, you could go to an autozone, o'reileys, or Napa to get the code read.

once you have the code read; then we can proceed.
be sure to notate this code and report back to us!