When I turn on the a/c it will blow cold for a few seconds then blow hot. If I turn the temperature control **** to the right and then back to left the a/c will blow cold again for a few seconds and then go back to hot. Also, if I do this **** turning trick but hold the **** to the left with light pressure the a/c will remain cold for as long as I keep my hand on the ****.

Any help would be appreciated.