i seem to be having a leak from around the pully. coolant sprays out sporatically in very small amounts(drops). this pump was replaced by a shop in the last 5 years.
1. is it possible this is just a gasket and not the pump itself? how would i tell?
2. attached is a video of what the temp guage is doing. i was advised my thermostat sticking shut (changed in the last 5 years). i did notice some grey sludge in my radiator upon refill after finding the leak. wondering if this is a product of air, or the sludge?
https://www.youtube.com/watch?v=fW8h6ZN5MJQ