"I think the hardware may need replacement and I feel that your car modeal (toyota?) may still be under some form of a maintenance contract that you signed with them. they may change the air conditioner for a really low price or even free. If you do not have any warranty or maintenance contract with Toyota, I highly suggest that you turn to a third party air con company to troubleshoot your aircon servicing
I changed my car aircon with Subcool with them and they have really good rates. Other than that, sorry mate not sure how else to help. if you are looking at replacing your car's air con unit perhaps you would like to render this company's services? my friend who sells secondhand cars recommend this company for installing air conditioners! If you would like to do aircon chemical wash you can find them too!"