2002 330ci engine swap

Just want to say Hi!.....newbe here and not quite sure how this goes but...... I just had to swap out the engine on my 330ci supposedly I blew a head gasket but the stealership had to perform this compression test to tell me what the shadetree mechanic told me for free. Anyhow......I purchased a used 530 360 engine with 55k(as opposed to the 125K+ on the engine that I am replacing) and got it installed. The problems are few; no air conditioning or heat and a check engine light. I am asking if there is anything that I should be looking for or be aware of???? Thanks for your help!!