Question about 1999 Toyota 4Runner

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Water seems to be trikling through system with engine running but with water hose it is a bigger flow. the problem is low heat output when heater on and I do not believe the heater core is bad/clogged jut hot water flow volume - make sense? Valve works great and allows water through

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  • dmartinross Oct 10, 2010

    Rubber pipes? I know about the "Hoses" and I did check them and there aint that many and as far as multi layers breaking away to creat a flap....not the issue.

    besides the "Rubber" pipes what could the problem be?

  • dmartinross Oct 10, 2010

    flushed in both directions and just replacd the thermostat as it did have some loose rubber on the gasket and even with the new thermostat, the water barely comes out of the hose when disconnected that feeds into the heater valve.

    this is strange as water flows great when I attch the garden hose, both ways and is clear just seems that the water pump is weak or the portion of the heating system that inputs to the valve. I will keep looking....

  • dmartinross Oct 12, 2010

    partially as i have treied all but replacing one hose that i cannot reach....I will let you know and thanks

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If you water pump is working properly and the flow valve is fully opening then about the only thing left is a clogged heater core. Have you removed the heater hoses and flushed the heater core out in both directions. In other words back flush it. Just be careful and do not apply too much water pressure or you may cause the hearer core to leak. You may in the end have to use a commercial flush product to clean the entire system out. Hopefully you will not have to replace the heater core as this is not an easy job. If it were me I would do a complete cooling system service including replacing the thermostat which can be partially closed thus restricting the flow of coolant. But if that were the case your engine should be running on the hot side. Are you 100% sure the heater flow valve is opening fully? I hope this has been helpful.

Posted on Oct 10, 2010

  • NOT ME Oct 11, 2010

    You have a tough one. Have you checked the hoses to see if they are collapsing. Check the heater hoses very carefully and replace them if you have any doubts. Also check the radiator hoses and any bypass hose. You did install the thermostat spring down?

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When there is a lack of heat, either heater core is plugged, The valve that opens to allow the coolant to flow to heater core can get stuck or plugged, or coolant level may not be a 50/50 mix.Or lastly, the blender is not going completely to hot position.

Posted on Oct 10, 2010

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Yes, it makes sense. The water is send to the heater thru rubber pipes. These are multilayer pipes and if the inner layer is cracked it can detach and the flap created will block the flow.
Replace the rubber pipes.

Posted on Oct 10, 2010

  • Azrael SRL Oct 10, 2010

    Pipes, hoses whatever you call them - they are clogged. Replace them, even the garden hose will do if you tighten it securely.

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