so i have a 2000 dts and i got the heads done a little over a year ago. about a week ago the water pump went so i got it replaced. a few days later it was running a bit over normal temp so i checked it was low on antifreeze so i topped it off. i checked back again this morning and it was low again so i put more in. now its getting a lot hotter and the bottom hose coming from the water pump is staying pretty cold. should i be worried about the head gasket.