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Laptop fan takes a long time to start working

Dec 22, 2018
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my laptop fan takes a long time to start actually cooling down the laptop resulting in high temperatures (70-90 degrees Celsius) The fan takes about 30-50 minutes to start and when the fan works, about 2-3 hours later it stops again...

The laptop was cleaned about a month ago, so I don't expect there to be much dust that makes it difficult for the fan to start, but if that's what needs to be done please say so.
 
Have a look in the BIOS settings to see if the fan's cutting in time is variable. If it isn't, there will be a sensor somewhere that needs replacing.

Search the Net for the manufacturer's service manual. Some of them are helpful.
 
MERGED QUESTION
Question from kadaouikadour : "Laptop fan takes a long time to start working"

my laptop fan takes a long time to start actually cooling down the laptop resulting in high temperatures (70-90 degrees Celsius) The fan takes about 30-50 minutes to start and when the fan works, about 2-3 hours later it stops again...

The laptop was cleaned about a month ago, so I don't expect there to be much dust that makes it difficult for the fan to start, but if that's what needs to be done please say so.