Volvo Forums - Volvo Enthusiasts Forum - Turbo owners overheating

I changed my radiator this weekend due to a leaking end cap.
Check out what I discovered. This seems like it would only apply to turbo models only. The picture of the whole radiator is orientated with the top towards you and this shows the back of the unit next to the fan. It appears the slight amounts of oil over years (123,000 miles) from the crank case breather system were deposited on to the back of the unit from the boost pipe connection to the intercooler. The whole area did not look wet from oil. Material then adhered to the oil and about 1/4 of the surface was blocked. This car had normal boost indications so I never assumed any sort of leak in the system..
It would be easy to check for this situation by removing the 4 torx screws
on the sides of the radiator near the top and having a look. The deposits were soft and could be cleaned easy. At least you could tighten the clamp on the intercooler