Question about 1993 Chevrolet C1500

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Water not flowing through top hose into radiator after installing new one

I just change the thermostat, water pump and heater core in a 1993 5.7 chey silverado. The radiator is only a few years old and looks clean. the water is not flowing back into radiator from the block. Top hose is cool until radiator gets extremely hot from fluid in radiator. what would make a brand new thermostat not open? I'll try it with the thermo out but was wondering if it could be something else that I hadn't thought of. Any ideas? I am also hearing the swooshing sound of the coolant circulating in the heater core. Any help is appreciated.
JD

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Hi JD,

Be sure there is sufficient coolant in the system. Not always as easy as it sounds (Be glad it's not a fiero, they are really fun)).

Fill it as far as you can while it's running. Let it get warm, rev it every once in a while. The level should begin to surge, let it keep surging until it lowers before adding more water. Top it off again.

Repeat the procedure until it doesn't lower any more.

This will get rid of any air pockets. Now fill the reservoir to the indicated level.

The only other thing I can suggest is making sure the water pump is the correct one as far as direction of spin. There should be an arrow indicating the direction the pulley should be turning stamped on the pump housing. Check it.

Comment me with any problems.
Mike

Posted on Jan 17, 2009

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