Water Circulation in my 1997 toyota corolla

I am having problem with the heat in my 97 toyota corolla dx. My father-in-law and I replaced the heater core and the thermostat. We realized that we weren't getting any water flow from out of the water inlet housing through the hoses connected to the heater core. We are checking for a clogged radiator but were told that it could also be a "water pump problem." If it is the water pump, why isn't the engine overheating? The temp remains directly in the middle the whole time we rev the engine. Please help, we are going out of our minds!

 

Often times there is a water cut off valve in one of the heater hoses. These valves can be electrically or vacuum actuated. Have you followed the hoses from the firewall all the way back to the engine looking for one of these cut off valves? If not, do that now. If you find a valve, check to make sure that it is opening, and not stuck closed.

If you find no cut off valve, start the engine and let it warm up to the proper operating temperature. Once the temp. gauge shows to be "in the middle" as you indicated before, put the HVAC controls on the "HOT" setting, and turn the fan on LOW, raise the hood, and touch both heater hoses right where they come out of the firewall. They should both be fairly hot to the touch. If they are both hot, you know there is flow through the core. If this is the case, I would suggest that you have a sticking or stuck damper door. The damper door is inside the HVAC suitcase-usually under the dash. The purpose of the damper door is to insure that no hot air gets into the cabin when you have A/C selected. Likewise, when you turn the heat on, the damper door switches position so that air flow from the fan is directed across the heater core and then into the cabin. If the core is getting hot, but no hot air at the vents, the damper door is most likely the cause.

If no water flow, or increased temp. through the core is present, then you need to figure out on the engine side why no coolant is getting to the core.

 

So, we have now replaced the heater core and the water pump. The old water pump seemed fine. No sign of blockage. The radiator was also flushed and seemed to have no obstruction of water flow. We can't figure out why the water isn't getting from the water inlet housing to the hoses. What else can it be?

 

you will need to check for air lock in the heater core, try undoing the clamps and inserting a thin bladed screwdriver inbetween the hose and the heater inlet pipe, see if air comes out and allows water to enter. some vehicles air lock and that can block the flow of water through the core.

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