My radiator cooling fan switches to high speed every time my A/C compressor clicks on and then shuts off when the compressor clicks off. Every couple of seconds it's going on and off. If I remember in the past the fan only switched to high when it was extremely hot outside and I was sitting in traffic then it would stay on until there was enough air moving thru from driving that it go back to low speed. Any ideas on whats happening. Maybe a sensor or something?
Thanks.

 

Low a/c charge?

 

Not according to the dealer. They say the charge is good however they also said there was nothing wrong with the A/C either. Then after rechecking it at my suggestion they admitted it was not operating properly but could not find the problem.