Inspiron 600m reseated heat sink now cpu temp JUMping around

Would appreciate it if someone can point out what I can do. I have a dell inspiron 600m which is 5 years old and still serving me faithfully. I use ubuntu on it and have a cpu temp monitor app. Now I usually open it to dust out the fan vents but never touched the sync. Today I found the sync completely clogged and so I unscrewed ( making sure not to touch the part which lies just over the cpu so as to do nothing to any thermal paste but as far as I could tell , no paste was left) the sink and then blew the clogging dirt and stuff out and put it back on top of the cpu. I screwed it back and now my laptop feels less hot and more responsive but there is a problem. the cpu temperature monitor app is now jumping around. I mean it goes straight to 66 from 57 and back to to 58 and then 52 and this is weird so now the question. How much should I have tightened the heat sink screws ( which lie on the part lying above the cpu) . Have I tightened it too much ? Too little or sth else. Since I did not do anything to the thermal paste( also by looking there was none) so I believe there is something wrong I did while reseating the sink. Please help.
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More about inspiron 600m reseated heat sink temp jumping around
  1. hi
    you forgot to apply thermal paste between your processor and the heatsink
    you have to clean and re apply the paste each time you take off the heatsink
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