Why is the CPU overheating?

Hi!
The CPU and Heat Sink A of my late 2008 MB (2 GHz Intel Core 2 Duo, 8GB RAM) are at 70-80 C about 80% of the time, although CPU and RAM usage is only at around 10% each. This causes the fan to run at ~6000 rpm. Why is the CPU overheating?
The reason does not seem to be a sofware issue: The overheating occurs both in safe mode and as a new user (sometimes even right after starting the machine). I have no Adware installed. SMC Reset did not help. Energy usage settings are as efficient as possible. I deleted Adobe flash player items in the library. Spotlight indexing is not the issue.
Therefore I suspect a hardware problem, although both AHT and the hardware test at the Genius bar did not show any problems. I have cleaned the fan and surrounding area thoroughly. The fan itself seems to be OK, since it correlates positively and perfectly with CPU temperature.
Genius bar suggested to switch from 10.9.2. back to 10.6., but this is not a long-term option for me. I think would have to hand in the machine to a specialist for further analysis, or for examining/renewingthermal paste, but I do not want to spend too much money on the machine anymore.
This is why I hope this forum has further advice!

Hardware Information:
    MacBook (13-inch, Aluminum, Late 2008)
    MacBook - model: MacBook5,1
    1 2 GHz Intel Core 2 Duo CPU: 2 cores
    8 GB RAM
Video Information:
    NVIDIA GeForce 9400M - VRAM: 256 MB
System Software:
    OS X 10.9.2 (13C1021) - Uptime: 0 days 1:59:22
Disk Information:
    TOSHIBA MK1653GSX disk0 : (160,04 GB)
        EFI (disk0s1) <not mounted>: 209,7 MB
        Macintosh HD (disk0s2) / [Startup]: 159,18 GB (33,01 GB free)
        Recovery HD (disk0s3) <not mounted>: 650 MB
    HL-DT-ST DVDRW GS21N
USB Information:
    Apple Inc. Built-in iSight
    Apple, Inc. Apple Internal Keyboard / Trackpad
    Apple Computer, Inc. IR Receiver
    Apple Inc. BRCM2046 Hub
        Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information:
Configuration files:
    /etc/sysctl.conf - Exists
Gatekeeper:
    Mac App Store and identified developers
Kernel Extensions:
    [not loaded]    com.ZTE.driver.ZTEUSBCDCACMControl (1.2.4) Support
    [not loaded]    com.ZTE.driver.ZTEUSBCDCACMData (1.2.4) Support
    [kext loaded]    com.bresink.driver.BRESINKx86Monitoring (9.0) Support
    [not loaded]    com.devguru.driver.SamsungACMControl (1.2.55 - SDK 10.6) Support
    [not loaded]    com.devguru.driver.SamsungACMData (1.2.55 - SDK 10.6) Support
    [not loaded]    com.devguru.driver.SamsungComposite (1.2.55 - SDK 10.6) Support
    [not loaded]    com.devguru.driver.SamsungMTP (1.2.55 - SDK 10.5) Support
    [not loaded]    com.devguru.driver.SamsungSerial (1.2.55 - SDK 10.6) Support
    [not loaded]    com.kodak.print.printerdock.merge (1.0.0) Support
Startup Items:
    HP IO: Path: /Library/StartupItems/HP IO
    HPlaserjet Trap Monitor: Path: /Library/StartupItems/HPlaserjet Trap Monitor
    HWNetMgr: Path: /Library/StartupItems/HWNetMgr
    HWPortDetect: Path: /Library/StartupItems/HWPortDetect
    LoginServer: Path: /Library/StartupItems/LoginServer
Launch Daemons:
    [loaded]    com.adobe.fpsaud.plist Support
    [loaded]    com.cloudpath.maccmd.plist Support
    [loaded]    com.oracle.java.Helper-Tool.plist Support
    [loaded]    com.oracle.java.JavaUpdateHelper.plist Support
    [failed]    com.sec.faxdb.plist Support
    [loaded]    net.sourceforge.MonolingualHelper.plist Support
    [loaded]    org.macosforge.xquartz.privileged_startx.plist Support
Launch Agents:
    [loaded]    com.hp.help.tocgenerator.plist Support
    [loaded]    com.oracle.java.Java-Updater.plist Support
    [running]    com.samsung.AWPAgent.plist Support
    [loaded]    org.macosforge.xquartz.startx.plist Support
User Launch Agents:
    [loaded]    com.adobe.ARM.[...].plist Support
    [loaded]    com.google.keystone.agent.plist Support
    [loaded]    com.macpaw.CleanMyMac2Helper.scheduledScan.plist Support
    [failed]    com.macpaw.CleanMyMac2Helper.trashWatcher.plist Support
    [running]    com.spotify.webhelper.plist Support
User Login Items:
    RescueTime
    Dropbox
Internet Plug-ins:
    Flip4Mac WMV Plugin: Version: 2.3.0.14 Support
    FlashPlayer-10.6: Version: 13.0.0.214 - SDK 10.6 Support
    iPhotoPhotocast: Version: 7.0
    Flash Player: Version: 13.0.0.214 - SDK 10.6 Support
    AdobePDFViewer: Version: 9.5.5 Support
    Default Browser: Version: 537 - SDK 10.9
    net.juniper.DSSafariExtensions: Version: (null) Support
    OfficeLiveBrowserPlugin: Version: 12.3.6 Support
    QuickTime Plugin: Version: 7.7.3
    Silverlight: Version: 5.1.20513.0 - SDK 10.6 Support
    JavaAppletPlugin: Version: Java 7 Update 55 Check version
Safari Extensions:
    Slick Savings: Version: 1.0
    Searchme: Version: 1.3
    Amazon Shopping Assistant: Version: 1.1
    Ebay Shopping Assistant: Version: 1.1
Audio Plug-ins:
    BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
    AirPlay: Version: 2.0 - SDK 10.9
    AppleAVBAudio: Version: 203.2 - SDK 10.9
    iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins:
    Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
3rd Party Preference Panes:
    Flash Player Support
    Flip4Mac WMV Support
    Growl Support
    Java Support
    MacFUSE Support
    NTFS-3G Support
    Paragon NTFS for Mac ® OS X Support
    TeXDistPrefPane Support
Time Machine:
    Skip System Files: NO
    Mobile backups: ON
    Auto backup: YES
    Volumes being backed up:
        Macintosh HD: Disk size: 148.25 GB Disk used: 117.51 GB
    Destinations:
        My Passport [Local] (Last used)
        Total size: 930.73 GB
        Total number of backups: 12
        Oldest backup: 2014-01-25 23:36:54 +0000
        Last backup: 2014-05-14 16:06:09 +0000
        Size of backup disk: Excellent
            Backup size 930.73 GB > (Disk size 148.25 GB X 3)
    Time Machine details may not be accurate.
    All volumes being backed up may not be listed.
Top Processes by CPU:
         8%    firefox
         3%    WindowServer
         1%    sysmond
         0%    fontd
         0%    SystemUIServer
Top Processes by Memory:
    893 MB    firefox
    229 MB    Finder
    172 MB    mds_stores
    164 MB    com.apple.IconServicesAgent
    106 MB    Preview
Virtual Memory Information:
    3.85 GB    Free RAM
    2.09 GB    Active RAM
    1.07 GB    Inactive RAM
    759 MB    Wired RAM
    810 MB    Page-ins
    0 B    Page-outs

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