Air Conditioning acting weird.

[Justin Ellis 2]

just recently my A/C has started acting weird. It only blows cold when running at like 2500rpm or driving on the freeway. Anytime i am sitting still with my foot on the brake it idles rough and sometimes just shuts down the trac complelely. When sitting still it drops down to 500rpm then clicks and jumps up to 1500rpm. i don't have a lot of knowledge with this stuff so any input would be more than helpful! Thanks guys

 

[EddieS'04]

Sounds like too much compressor head presure. Have it checked, by an auto HVAC tech. There are multiple reasons for that.