I am going to give you his phone number, but you will need to find some Thai guy to communicate with him as he is not an english speaker . So i hope you don't mind about that, but he handle chevrolet cars very well. His place might look somewhat like a junkyard but believe me he is really good. His number is 089-813-77 six zero.
It is very complicated to reach his place, just copy and paste the following coordinates on google map and it will show u where he is. 13.639072,100.693632
Thanks for your help Phenomenon, it's appreciated.
My Thai language ability is still just above basic (still learning), so I'll ask one of my colleagues to give him a call next week when I have some time to get my car over to him.
Location looks easy to find, just a few km's from my my condo.