An car amplifier needs proper ventilation for it to perform correctly. If your car amplifier overheats, it will randomly go into protect mode. This will shut down the car amplifier from operation until it has cooled down. The best solution is to stop your car amplifier overheating in the first place, as the last thing you want is your music not playing in busy traffic. There are many ways to consider cooling your car amplifier down. The most easiest is to get an PC 120mm fan and attach it directly onto the metal heatsink. This will allow cool fresh air to directly be blown onto it. The more fans you add the better the cooling will be, I usually recommend at least two. If your not too bothered about your car amplifier looking pretty, then the best solution is to drill the screws holes directly into the metal heatsink. Then apply an screw into each corner of the PC fan to mount it in place.
In terms of powering the fans, you want an 12 volt source that is switched, it is possible to run the cooling fans from the blue remote wire. However, this will only provide 5 volts which is not enough to run the computer fans to there maximum potential. The best way is to use an fuse tap and find an switched fuse circuit in the fuse box, verify this use an test light. You can use the ground of the amplifier for the negative wires from the fans so thats ok.
If you don't fancy make modifications to your car amplifier, then you perhaps consider were you have mounted the car amplifier? Has it been mounted under the seat? Is it stuffed behind the box with lots of rubbish in the boot? The key to keeping the car amplifier cool and not overheating is to ensure its getting a lot ventilation around it. The best place to mount an car amplifier is directly on the back of the seat and leave at least 5 CM between the enclosure and the amplifier. This will provide enough airflow around the car amp to prevent it getting damaged.
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