Re: 51 300 Radiator Cap?

Posted by Tim Cole On 2016/7/1 8:16:09

I think I'll change my opinion then if the cars were being delivered with the higher pressure cap. The radiators on the 24th and later series were smaller so higher pressures might be needed. I never saw an original high pressure cap so maybe Packard was making that dual specification for extreme climates.

As well those motors run hotter with age so I might consider installing an overflow bottle rather than risk blowing a hole in the heater core or radiator. Given there is no expansion tank the correct level of coolant is that which covers the cooling fins. The top tank is the expansion area. Using that level I never had a problem unless there was another issue with the cooling system.