T 420s cooling air coming out is very hot, finger print reader problem

I am living in ruwais, abudhabi.i bought T 420s in last June from LENOVO  authorized distributor. Model number is 4174-KK4 and the sr no ***.
Sometime the cooling air coming out is very hot, unable to keep the laptop on the lap.
The cooling fan also replaced still the temperature is high.
After replacing the fan I noticed that I noticed one of the screws was not fixed, I asked them to fix it, then they fixed it.
I traveled back to my home 240 KM from the  authorized distributor service  center. when I started the laptop, the fingerprint reader was not working . Then I traveled back 240 KM to the  authorized distributor service  center to fix the issue. They fixed the fingerprint reader problem.
Then now the SD card reader is not working. I was asked to bring the laptop to the  authorized distributor service centre.
Can any one experience the same type of problems  with T 420s the cooling air coming out is very hot, finger print reader problem, card reader not working?
The authorized distributor says for the service they can only cover 50 KM form the  authorized distributor service  center to the customer point, what is the conditions for the On site warranty ?. I am living 240 KM away from the authorized distributor service center from whom I bought the laptop.
Moderator comment: Serial number(s) removed to protect member from mischief.

Well clearly after the first incident. You need to check and us it verifying everything is working before leaving the service center or town its in. Go to a coffee shop and spend time using it and test each option is working.
When the notebook its opened the finger print reader, card reader etc may not be connect properly or connectors not snap fully and disconnect. Mouse ultranav I have heard may also. But clearly you assume too much and you need to spend the time testing its working before leaving.
These service center are only paid a fixed amount so they won't spend anymore time then they have to and address one problem you brought it in for.
As for heat out put and over heating. There are many threads on these systems you can find and read about.
Advice:
- install Core Temp, this will monitor and display on the task bar you CPU core temp and you can see CPU load & Temperature at a glance if it approaching or staying near the max levels which will kill the CPU and/or motherboard due to cooking it. Its free just be sure to deselect any additional software from installing during the process. I use it on my notebooks. If the system is running high core Temp all the time you need to have it resolved or it will die and most likely out of warranty and/or your data will be lost if you don't have a backup as well. http://www.alcpu.com/CoreTemp/
- use a laptop cooler. Its a flat pad you sit the laptop on you lap or table with usually two cooling fans that plug into the USB port for power. It will help cool the base of the laptop and other components inside will not be as hot. This will do nothing for the CPU temperature though.
T520 Model 4239 Intel(R) Core(TM) i7-2860QM CPU @ 2.50GHz
Intel Sandy Bridge & Nvidia NVS 4200M graphics Intel N 6300 Wi-Fi adapter
Windows 7 Home Prem - 64bit w/8GB DDR3

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