When you go back you may want to try one of the ELC1 coolants by cat, chevron,rotella, or texaco all the same formula. Went to it in all of my oilfield equipment 10 years ago when it was introduced cut water pump seal failures by 95% , bearning will still eventually fail but only at very high mileage. Even dodge has switched over to it in the third generation. Have run it in 4 dodge cummins first one sold at 180,000 second at 129,000 third one is at 96,000 still driving fourth at 30,000 no water pump failures at all. There is an old mechanics trick that will buy you some time if you don't have one available for immediate replacement. Drain the radiator then take a rubber tip blow gun hold it tightly against the weep hole and blow compressed air back thru the waterpump seal , usually they leak because solids circulating in the antifreeze become lodged between the two halves of the seal and the air will dislodge them works about 80% of the time. can also be done without draining the radiator just remove the cap but you will get an antifreeze geyser when the air comes out.