In the turbocharger setup, the intercooler cools down the hot air from the turbocharger. This is to gain more horsepower since cold air has more
oxygen in it than warm air.
The turbocharger setup
The intercooler system
The intercooler uses water to cool down the core. The water is warmed up by the air from the turbochager (and the air is cooled down), the warm
water is pumped threw the heat exchanger (radiator) in the front and is cooled down again.
The top mounted intercooler
The inside of the intercooler can get quite dirty, so if you haven't done so yet it might be a good time to clean it. To do this drain the intercooler
coolant by removing the drain cock in the heat exchanger. Unbolt the three bolts that hold down the intercooler and unscrew the clamps. Remove the two hoses
on the left side. Remove the intercooler, turbo side first. Close of the inlet and the blow-off valve opening with a bag or something. Poor petrol in the
intercooler and shake it some time. Drain the petrol. Repeat this proces until the petrol is clean. Install everything in reverse order.