No Choke??

Hi, I recently had a problem with my 200 golf 1.4 16V stalling!! I cleaned the throttle body out completely and re-assembled. The results were good, engine ran really well, no problems at all. Over the past couple of days i have noticed that when i do a cold start in the mornings, I have no choke. The car really struggles to get going and has to be throttled to start. No throttle and the car just winds over. Today i changed the coolant temperature sensor. But that does not seem to have helped!! Any help would be much appreciated!! Many Thanks!!