my vectra elegance c dti has got this problem the car temp is takin its time to warm up i mean ages. Ok i drove it yesterday for 7 hours yesterday the heaters were blowing out luke warm not even warm the temp neaddle didnt move a notch i recently had d polyn filter changed in my pervious service. Ive even topped up my anti freeze but thats not doing anything both my front and bak demisters work fine. starts 1st time help plz guyz