Skip to main content

Model A1502 / 2.6 GHz (Turbo Boost up to 3.1 GHz) or 2.8 GHz (Turbo Boost up to 3.3 GHz) dual-core Intel Core i7 processor with 4MB shared L3 cache.

495 Questions View all

How to check heatsink is working ok

my Macbook pro Retina 13 start with fan sound and no boot no sound no keyboard light and cpu heat too much ... if I replace the logicboard it will be ok, how I know that the heat sink is working ok or its sensor it is working ok?

Answered! View the answer I have this problem too

Is this a good question?

Score 3
Add a comment

1 Answer

Chosen Solution

First I would install a good fan & temp monitoring app. I like this one: Temperature Gauge Pro. It will give you the details on what is happening with your sensors and the fan it self.

The heat sink (the CPU's heat management) its self is mechanical, so your issues are limited to the three possibilities:

  • The thermal paste was not applied correctly, missing or bad.
  • The fan unit is not cooling the heat sinks fins because it has failed or it is fan blades are dirty or the fins are clogged with dust.
  • The liquid within the heat transfer tube has leaked out (if it has liquid) so it is failing to conduct the heat away.

Given the age of your system it should be covered under warranty. I would strongly recommend you get your system into an Apple Store ASAP as you don't want to lose the free warranty repair (logic boards are quite expensive to replace).

Was this answer helpful?

Score 4



EVEN I, a business owner, didn't realize that heatsinks on Retina's have fluid in them.

I'd love to know what that fluid IS. And, I think it's absolutely screwed up that Apple Looks for excuses to not cover things that CANNOT be a customers fault... but MUST be a defect... such as, telling me that the key imprints on the UV filter of the display are MY FAULT!? But... if I wiped the display off and it therefore came off, due to VOLUNTARY choices? That... that qualifies as being under the Quality Program. lol.

But more importantly. Your remark and very useful information above:

The liquid within the heat transfer tube has leaked out (if it has liquid) so it is failing to conduct the heat away.

Virtually no one realizes this is an issue... and it can ONLY be Apple's manufacturing knowledge and choices... which include, making it a part that can fail, but also making it unserviceable.

Thanks again!


@Truman Absolutely. I would be bamboozled myself if I didn't know the heatsink failed by leaking liquid (who can even know that?) and the most valuable company's once premium 2011/12 macbook pro cannot conduct heat anymore, if not for this guy @Dan's solution. He's definitely an expert in this.


Don't the A1502s have fans that don't spin until the CPU gets hot enough to a certain temperature like 60°C and above?


@Vijay Kanta & @benjamen50 - The fan will run at a very low RPM not stopped with nothing active (OS only).

As you run apps (CPU load) the fan will ramp up. The best thing here is to run TG Pro app and watch the RPM as you load the system with more processes. Apple has altered the RPM Algorithm across the different series and firmware releases enough that I haven't try to reverse engineer each template. While it would be nice it doesn't help in the repair.

The key is looking at the exhaust temperature and the thermal load temperature they should be within 20ºC of each other at state. It will be greater at the beginning and less as the heatsink looses its ability to shed the heat via the radiator.

Think of it like a bucket which you are pouring water into that has a hole at the bottom. The size of the bucket is the heatsinks mass which dictates the amount of heat it can hold before the water overflows at the top. The size of the hole at the bottom is the fans ability to shed the heat. The rate you fill the bucket is the amount of heat your CPU/GPU is creating. Don't forget the environment also can effect things here as well as that sets the stage on how much water is already in the bucket.


Thank you Dan. This may have just solved my problem also. I downloaded TGP and when I try to run Cinebench, the exhaust is around 90 degrees Fahrenheit and the load gets up to 190 plus Fahrenheit before it shuts down. I’ve cleaned it and replaced the paste also, to no avail. I have a MCP late 2012- mod A1398. Bought it used a month ago. Will try grizzly paste and see if that helps, as I used MX 4 the first time. I will also order another heat sink for it.


Show 2 more comments

Add a comment

Add your answer

Ahmed will be eternally grateful.
View Statistics:

Past 24 Hours: 1

Past 7 Days: 6

Past 30 Days: 33

All Time: 2,201