R u sure its sucking it threw the intake mani? The only coolnt line that goes to the intake mani is the 1 for the IACV. There are 2 lines that go 2 the IACV. 1 is vaccuum and the other is a coolant line u may have them backwards but if the car was running fine before then u did have them right. Now if u did blow the headgasket, coolant would get into the combustion chamber and thats y u smeel coolant burning