explorer2006

Does anyone know of a good garage in musaffah where they fix a/c issues of ford explorer? My ford explorer is 2006 model and the a/c on one side is not very cool when it is very very hot outside. I went twice to al tayer and premier motors but they told me to change the evaporator which costs above AED 3500/-. But whenever I dropped my car for this service, it returned after they changed some small parts which costs around 1500/- In addition to that they do not guarantee the resolution of the a/c problem permanently. Please help.