2.26 or 2.4 GHz / White plastic unibody enclosure

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Time to replace the Thermal Paste?

I've had my MacBook 2.26 GHz Core 2 Duo (13-inch Late 2009) MC207LL/A MacBook 6,1 - A1342 for going on three years this December, I bought it used through eBay and it's been running great after numerous upgrades / replaced parts including the Cooling Fan so I know that's not an issue.

I've Googled what the normal operating temperature should be and it seems to be in the normal range but suddenly the range keeps changing from 104° F to 122° F ( CPU die ) with the exhaust fan running at 6200 RPM + - ( smcFanControl ) but not holding steady or dropping below that range. ( Battery power )

Same readings with iStat Menus -

The only app running right now is Safari and CPU usage is not abnormal , Background processes aren't out of bounds.

Sensors check out, Could it be time to replace the Thermal Paste on the heatsink ?

Answered! View the answer I have this problem too

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Chosen Solution

Make sure your fan vents are clean.

Here's how to get to the heat sink: MacBook Unibody Model A1342 Heat Sink Replacement

Here's a guide on replacing thermal paste: How to Apply Thermal Paste

Here's where to get the thermal paste: Arctic Silver Thermal Paste

Arctic Silver Thermal Paste Image
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Guide

How to Apply Thermal Paste

Difficulty: Easy5 - 20 minutos

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If the cooling fan is running then i would try and replace the thermal past just to see if that fixes the issue it it does not then the issue is something else. It is always best to start cheap then work your way up when fixing issues.

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David Bell will be eternally grateful.
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