Replace the heatsink careful to put it straight down on the cpu.
Clean heatsink thermal paste.
If it isn t clean it reapply thermal paste and make sure it is now connected much more stable to the cpu.
Remove the heatsink depending on what kind of heatsink you have flip the latch or release the retention clips that keep the heatsink attached to the cpu.
Ipa 90 concentration or greater to clean the thermal paste residue off the thermal contact surface of your heat sink.
Thermal paste or some oily thermal interface material is necessary because it fills in the microscopic imperfections that otherwise trap air particles between the cpu and the heatsink preventing the cpu from properly cooling heat radiates outward from the cpu to the heatsink before eventually making its way to a fan where it disperses.
Clean out the heatsink and cpu then apply a very thin even coat of thermal paste on the cpu.
Inspect it for any thermal paste where it came into contact with the heatsink.
Wipe away most of the thermal paste that you can and then use 99 pure ipa to clean away any residue.
Macbook pro 15 unibody early 2011.
Looks like you have no ventilation.
I like to use kimwipes as they leave very little lint.
Thermal paste can get mighty hard depending on how long it has been applied for.
If you find any use the same steps to clean the surface.
6 5w m k thermal paste cpu paste heatsink past thermal compound.
But since air is a notoriously poor conductor of heat.
Thermal paste can sometimes harden which greatly reduces its effectiveness.
Avoid using rubbing alcohol which is just 70 ipa.
Use a coffee filter or a lint free cloth and a little isopropyl alcohol a k a.
Note that if you remove your cpu cooler for any reason you should always apply new thermal paste.
If this is the case you will need to remove the old thermal paste clean the surfaces and then re apply new thermal paste.
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