Water Pump - Failing When Hot
#1
Water Pump - Failing When Hot
Is it possible that a Northstar water pump can work when cold and fail when hot? It seems to be happening on my 1999 Seville. :-)
I pulled and extended the return line at the coolant reservoir and it flowed out into a pail when it was cold. After it gets warm however there is no flow.
How likely would an air lock be if I am continually topping it off (with the engine running) with distilled water? My thought is that there should still be flow since there is a bypass around the thermostat where an airlock might occur.
There is no steam coming out of the exhaust. No sweet smell to indicate a blown head gasket. No water in the oil nor in the oil cap. When I tried a block test it did not turn color before it started boiling over. I don't think it is a head gasket. It churns violently when I put it under load and comes out the radiator cap.
I think it must be the water pump. I wasn't aware that it could flow when cold and shut off when hot though. When it was cold the flow rate did seem a little slow though.
Thanks!
I pulled and extended the return line at the coolant reservoir and it flowed out into a pail when it was cold. After it gets warm however there is no flow.
How likely would an air lock be if I am continually topping it off (with the engine running) with distilled water? My thought is that there should still be flow since there is a bypass around the thermostat where an airlock might occur.
There is no steam coming out of the exhaust. No sweet smell to indicate a blown head gasket. No water in the oil nor in the oil cap. When I tried a block test it did not turn color before it started boiling over. I don't think it is a head gasket. It churns violently when I put it under load and comes out the radiator cap.
I think it must be the water pump. I wasn't aware that it could flow when cold and shut off when hot though. When it was cold the flow rate did seem a little slow though.
Thanks!
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