IS IT AGAINST LABOR LAW, IF A COMPANY WILL NOT SUPPLY AIRCONDITIONING FOR A VEHICLE USED FOR DAILY WORK PURPOSES.
Ordinarily, I would say no. But if you have a chronic medical condition such as asthma, and the lack of air conditioning is the only thing that keeps you from doing your job, you should talk to a labor and employment attorney near you, as soon as possible. One place to find the lawyer you need is our website, http://attorneypages.com
There is a federal law called the Americans With Disabilities Act (ADA). It prevents discrimination against workers based on various physical and emotional disabilities, in certain ways, and one of the rights under the ADA is for a "reasonable accommodation" to the worker's physical limitations. This can get complicated, and an experienced attorney is usually needed to work it through, but if you can do the job, with a "reasonable accommodation" that makes the working conditions bearable without being too expensive or otherwise disruptive to the employer's business, they have to give it to you.