Take the cover off the CPU and vacuum that sucker out.
1. Turn off the power.
2. Unscrew case screws.
3. Touch the power supply to take static electricity off you.
4. vacuum.
5. Turn on again with case off - check fan. Fans are $20.
6. Leave the case off and make a convertible to give it more cooling till You get a fan.

Tom wink
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Don't wait for perfect weather to go fishing - You'll spend too much time at home. Enjoy Life!