So a couple weeks ago my car (02 wrx) started to overheat and started leaking radiator fluid. Found out that radiator went bad so had it replaced along with my t-stat. After I had it all replaced I noticed that it takes alot longer to warm up and that when I coast down the highway, when I say coast I mean im not giving it any gas at all, the gauge goes down to the "C". I took it back to the shop they went through it all and couldnt find anything except that the bottom radiator hose is cold when at running temp. Anyone have any idea what this could be? Isnt it bad to have a car running to cold?