Mechanical Problems

My sister moved to Texas to be with my grandpa who has cancer. Every Dr visit the cancer has spread to another part of his body. She quit her job here in AZ and moved to TX along with my nieces and nephews. She has a job that barley gets them by so having to add to her stress of everything going on around her,her a/c went out in her truck and she can't afford to get it fixed. Its hot humid and just miserable for her and the kids. Just to have it looked at is 150.00. The parts cost around another 100.00 then what gets expensive is the actual labor. Which could be hundreds of $. Hearing my nephew on the phone saying I'm so sweating auntie broke my heart today. Anyone that knows my sister knows she gives a lot but now she needs help. Please any thing would help to get her car fixed for not only her but her babies so their not so miserable driving in the heat. Thank you and God bless.