Hey all I purchased a 2001 GMC Jimmy for two thousand dollars today. And the four wheel drive system doesn't work. ( It is throwing a code however and I am gonna find out what the code is ). It also doesn't blow much heat and you can small coolant while driving. But the engine hasn't overheated. So what could be wrong? Would like to hear some good opinions. Thank you all!
Note: Header Image is not my actual vehicle. Just a similar looking vehicle off the internet.