Nvidia geforce graphics card 320 overheating

I have been using this pc for over 2 years. In the Spring of this year the pc kept crashing. I have found out that the graphics card is reaching temperatures of 105 degrees C when playing games. I have cleaned all the fans in the pc with air.

I have been told the heat sync is probably no longer functioning correctly.

GPU temp is 66 deg C when the pc is in normal use and fan speed 40%.

As soon as I play games the fan goes to 100% and the temperatures rise until the card crashes.

Any suggestions would be appreciated.

I was having problems with the Nvidia chip in this laptop. Blowing out and cleaning the fans didn't seem to do any good so I took the advice of others and cleaned off the old thermal paste and applied new. It definitely appears to have help. No laptop shut downs since. I used Arctic MX-4. Search Youtube for instructions.

Also, for peace of mind, I uninstalled any temperature monitoring program.