After installing Lion , my computer crashes and the fan runs constantly on high

After installing Lion , my computer crashes and the fan runs constantly on high. How is Apple resolving this problem?

Try to reset your SMC, it fixed the same problem for me ;o)
http://support.apple.com/kb/ht3964

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    ==================================
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    I am having the exact same problem!!!! just posted same question

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    Sorry to be so late getting back to you. My furnace died and I was a week without heat. Everything's ok now.
    I was able to grab an old firefox from an external drive (thank God for backups!) and I used that along with the link that you sent me for older versions and I was able to download the version before the current update.
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    Imac 17 in Intel 1.83 ghz Intel duo core 1 gig mem   Mac OS X (10.4.5)  
    Imac 17 in Intel 1.83 ghz Intel duo core 1 gig mem   Mac OS X (10.4.5)  
    Imac 17 in Intel 1.83 ghz Intel duo core 1 gig mem   Mac OS X (10.4.5)  
    Imac 17 in Intel 1.83 ghz Intel duo core 1 gig mem   Mac OS X (10.4.5)  

    I second Dave it needs to go back to service. What I have heard happens sometime is one of the temperature sensors is either not put back on properly during reassembly or it comes of soon after. With an incorrect temperature reading that particular fan will run at full speed. You can check the fan speeds by installing iStat Pro: http://www.versiontracker.com/dyn/moreinfo/macosx/27037
    George

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