when the fan and heatsink fails and you still use the card then eventually because of heat on one fine day the card will start to burn and thats it service man will tell 'no warranty for burnt cards'.so don't use the card when it's cooler not working.
do as guru_urg has told,ask any service centre whether they have any fan of old cards or do as i suggested buy a cheap 80mm fan and tie it to the heat sink using the wire cable ties.don't spend much on that 3 year old card.
@sukesh1090: the heatsink is fine, even the card was working fine but one fine day it struck on my mind that there's a term called life expectancy for fans so I opened the cabinet and saw that the fan was rotating in somewhat abnormal way. On further exploring it I found that the ball bearing holding my fan has started melting and its kind of difficult for me to find such a fan. Are such fans available in India(ONLINE)?
Evercool 50x10mm Buried Frame Type Video Card fan â€• Lynx - The Audio , Electronics And Computer Online Shopping Store In India
don't you all think it is overpriced?