Seville Sls

95 cadillac seville northstar engine sls Had a leaky water pump so I changed it. When I started engine the?

cooling fans ran for 3 seconds and have not come back on. The top heater hose to radiator is red hot and the bottom radiator hose which connects to thermostat housing is ice cold. Coolant temp reaches 210 degrees in about 10 minutes. Could the thermostat suddenly gone bad, it was ok before I changed the pump????
At what temp should the fans turn on and the thermostat open fully?

You have an air lock, bleed the air from the cooling system,

hot water not air will allow the stat to open

do this by loosening hose to remove air, then start engine

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