Matt Dalton

hey guys so i have had some trouble with my car now i did find that there was no coolant in the reservoir the car was running really rough and would shut off after a few seconds, so i pulled out my oil filter to with coolant in there, so i have emptied the oil/coolant out of the sump. now it does sound like the head gasket i am just wondering if any chance it could be the oil cooler, now when i pour water into the coolant reservoir about 2 mintues later it comes out the sump! any ideas on what it could be, or cheap quick fixs as im selling the car, thanks for your help in advance!