Volvo 940/960 » Radiators

Years of normal operation can induce conditions that gradually reduce the cooling efficiency of the radiator. One condition is caused by a build-up of road grime on the front side of the radiator. This is a very common problem on cars equipped with AC and is not visible as the AC condenser obstructs the view. The build-up reduces the surface area of the radiator, gradually reducing cooling effectiveness to the point where it may not be able to properly cool in hot weather. This results in boil over. This problem can usually be resolved by aiming a high pressure wash from the fan side of the radiator to blast the build-up off of the radiator. This should be done once a year as preventative maintenance.