From a message on
http://www.volvospy.com/resources/300/volvost1.php
A word of warning about using Holts Radweld in the cooling system of your car, from personal experience. A couple of months ago our 360 suddenly developed what sounded like a very expensive rumbling noise coming from the bottom end of the engine. Luckily we were not far from home and were able to drive steadily back for a closer inspection. Listening to the engine with a short hosepipe it certainly sounded like a bearing had gone. However, when the belts were disconnected from the cooling fan and alternator the noise stopped. The alternator was OK but when I turned the water pump pulley it made a terrible grinding noise. The bearing in the water pump was very badly worn which could have resulted in the fan shearing off through the radiator! When a water pump is beginning to wear, leaking coolant normally escapes through the drain hole in the bottom of the pump. As Radweld had previously been used in the car this did not happen as the drain hole was sealed. The pump was found to be full of coolant with a badly worn bearing which could have sheared at any time without warning.
So, now where does this leave us? If the seep hole on the water pump is "sealed up" by the "Subaru Cooling System Conditioner" (aka Holts Radweld) then what course of action do Suby owners have? I guess we could go back to Subaru, they could go to Holts (Honeywell) etc.
Tom Reynolds
Sand Springs, OK
