$ sensors
thinkpad-isa-0000
Adapter: ISA adapter
fan1: 3126 RPM
BAT0-acpi-0
Adapter: ACPI interface
in0: 12.55 V
curr1: 0.00 A
coretemp-isa-0000
Adapter: ISA adapter
Package id 0: +51.0°C (high = +86.0°C, crit = +100.0°C)
Core 0: +47.0°C (high = +86.0°C, crit = +100.0°C)
Core 1: +47.0°C (high = +86.0°C, crit = +100.0°C)
acpitz-acpi-0
Adapter: ACPI interface
temp1: +49.0°C (crit = +99.0°C)
so there could still be dust in there.
Check the CPU temperature. Command:
sensors