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????95 cadillac seville northstar engine sls Had a leaky water pump so I changed it. When I started engine the?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 engine95 cadillac seville northstar engine sls Had a leaky water pump so I changed it. When I started engine the?
OK One Fan is for the A/C Condenser, Does it come on when you turn on the A/C? If not you may have inadvertently shorted the wiring when Replacing the Pump. Radiator fan most likely is the Thermostat! Sensor the Signals the Relay to Cycle the fan works only with the Thermostat Open and Coolant is Flowing. Good Radiator Shop if you're not sure how to Repair the System. Cooling Systems on the "NorStar Engines" are Good (In most cases Better) but Difficult to handle some times.95 cadillac seville northstar engine sls Had a leaky water pump so I changed it. When I started engine the?you have an air pocket in the system as bustass says,but do not remove the hose,just remove the cap l;et run to operating temp with the heat on and the fan speed on high,let run till cooling fans cycle you will see the system burp,also squeeze the upper radiator hose a couple of times while the cap is off.once all the air is out you can refill the coolant to the hot level,replace the cap and your good to go.95 cadillac seville northstar engine sls Had a leaky water pump so I changed it. When I started engine the?
Make sure you got the right water pump

depending on the options for you car, the belt may route a different way which sometimes turns the water pump backwards!!!

Sound crazy but I've seen it before

Similar pumps may fit the engine but it's internal fins maybe wrong for your application95 cadillac seville northstar engine sls Had a leaky water pump so I changed it. When I started engine the?Yes95 cadillac seville northstar engine sls Had a leaky water pump so I changed it. When I started engine the?
sounds like it, it is easier to change the thermostat, and see if that works than redoing the waterpump



Good Luck!