how flush chevy s-10 heater core?

Answer 1

Remove the hoses going to the heater core, run water through the core both ways. I would suggest applying compressed air through the core, push water through both ways, apply air to the other side of the core, and flush both ways again. I would repeat this a few times and reinstall the hoses, top the coolant and check for proper heating.

Answer 2

Normally I have flushed them by removing the heater hoses from the engine or radiator and connecting one to a garden hose. Applying water pressure until you get nothing but clean clear water coming out. If this doesn't work then it is possible to pour some cooling system cleaner into one of the hoses and let that soak in the heater core for a spell before attempting again. That doesn't work then looks like heater core replacement is in order. Chevy usually doesn't have a heater valve as the water flows all the time on most Chevy heater cores so water should flow easily all the time through it.

Answer 3

You can buy a flush kit at any auto parts store, and it will allow you to run a water hose through it, do it in both directions to make sure that you get it backwards.

but I have never seen any real or lasting effect in doing a back flush, and considering that the heater core is not extremely expensive, I would recommend replacing it.
It is not hard.

Answer 4

if you are going to just flush the core,then take off both hoses and use a water garden hose and hold it up to each hose and flush the core.

Answer 5

easy it's on the left side, just open it and stick a water hose in it..that's what I did.