Can you bridge a car headunit for more power?

Well we all know that you can bridge a car amplifier for more rms watts but can you bridge a car headunit?Well yes you can because a car headunit acts just like a car amp,its just slightly less powered.Most car headunits are around about 30 rms watts per 4 output channels.When you do bridge a car headunit,it can get really hot and start to overheat.This is because most car radios are not designed for big watts and power.The space inside the car headunit is really small and tight and makes it harder for the built in amp to dis pass the heat quickly.Most car cd players stop working after a while because bridging will put more strain on the stereo.So if you do decide to bridge your car headunit then adding a cooling fan to the back will stop it from overheating and increase the life span of it.