If you are in a pinch you can wing it with the datasheet of a similar component by a reputable manufacturer. Just know that you can’t quite trust the sheet but it should give you an idea of how a sane pump should operate. Like if a similar manufacturer makes a pump with an expected operating temp of 80C and yours is 150C, probably don’t need the exact data sheet to know that may be a problem.

So find all the 12Vdc water pump datasheets for pumps of similar form factor to yours and cross reference them to get an idea of common values. This will give you an idea of if your pump is behaving.

All you care about is temperature so should be easy enough to work out from 3-6+ datasheets. However many you are able to find.