I was driving one day and it cut off. When I tried to turn it back on it made a clicking/grinding sound. I assumed it was my flywheel/ starter. Mechanic says he can't do anything because the engine is locked and it needs to be replaced. I honestly don't want to junk it after I just put in a new compressor plus other repairs. Is it worth it to replace the engine. My mechanic is charging me $1,800.