I have backflushed my heater core, and the hoses get hot. Water from heater core flowed easily and clear after the brown crud was flushed out. But yet still no heat. The a/c works great, i can hear the blend door moving when i mess with the controls, radiator is clean. I have not yet checked the thermostat and water pump, but i believe problem is that the heater core is bad. what do you think? can help me?
Re: Cool air blowing from heater, even when on high.
If the heater core is bad, it will leak or not flow water. even tho you can "hear" the blend door working, it may not be actually moving inside the box. check to see if the actuator is connectd to the blend air door. You may be hearing the actuator moving but not the door.
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Simple. You find the heater hoses feeding the heater core. Typically they are a smaller diameter then radiator hoses and they both run to the firewall. You will need to determine which one feeds the heater core ...the input hose. Once you know that ...check a Taurus owners forum or Google it ...then run your water through the heater core from the output side. The idea is to back flush the core in the hopes you knock loose the crud with high pressure water flow.
This heater core flush is usually done in conjunction with flushing the entire cooling system. Do the cooling system flush first then the heater core. When you do the system flush, use some flush agent ...Prestone makes it. If the directions say use one bottle, use two. The stuff is generally not all that potent and designed not to contaminate the ground water. Which means it's fairly lame stuff. Use two bottles.
Feel your heater hoses. If both are hot, the heater core is circulating coolant, and the thermostat is not a problem. The door controls in the heater case need attention.
If only one heater hose is hot and the other cool, look for a water valve in the heater hoses-may be closed. Or the core has an air blockage or blockage-try to backflush it with a garden hose.
If both heater hoses are cool (on a warmed up engine), then it could be thermostat is stuck open.
If the heater core bypass refers to the water flow to the heater core, I would wonder why you did not flush the heater core as part of the system. You can drain water from engine, disconnect heater hoses and add a short hose to the heater and force a garden hose to flush the core.
I have not looked up the particulars for which heater system is on your car. Some just use duct-work to close off air flow through the heater core and the heater core always has hot water in it. Others will use a valve to shut off the water flow through the heater core and they can be either electric or vacuum operated. Combination systems are the third system which controls water flow and duct air flow at the same time.
Some of the Premium Climate control systems with Electronic displays have a computer diagnostic system which self-diagnoses problems but you need the sequence codes and explanation of where the bad part is located.
If the core is clogged because of particles and corrosion you may just want to replace it. You will have to unhook the two water hoses to the core and backflush the core and that shjould push the stuff back out the inlet hose. The two lines are the ones on the back of the engine firewall.
Sounds like a plugged heater core or weak water pump. Take the heater hose loose from thermostat area and the other hose loose from water pump inlet,and reverse flush water from a water hose from the water pump heater hose,assuring that the hose end from the thermnostat outlet is pointed downward away toward the ground. I always tie a loose WHITE rag around this end so I can see what debris is backflushed out.If very little debris,you probably have a weak water pump after all. The backflush is a good thing though. don-ohio
sounds like there is a blockage in the heater core. I would sugest taking the hoses loose and using a garden hose see if water can flow thur the core. If it dont flow thru the core you might have to replace the core.
It's possible that the heater core is plugged internally with crud and this is preventing the hot water from flowing through it which will cause one hose to be hot and the other to be much cooler. If the temperature gauge is indicating that the engine is reaching normal operating temperature and the heater controls are functioning properly then you may need to have the heater core backflushed or replaced. Hope this helps and good luck!
i wish you luck but is the temp staying in the usual place on the meter... could be as simple as a heater coil. or maybe the electronic control is not changing to flow water to heater core.. check engine light on?: turn heat on off on off on off to try to get it to change flow.. good luck
Read all of these instructions before starting this job. First test your heater core for flow by disconnecting both heater core hoses from motor and forcing air from an air compressor into one of them watching for flow from the other. If you have no flow then you may need to backflush your heater core - it is possible you have blockage in it. Your local auto parts store has a backflush kit you can buy that will have a backflush valve ( to be added to your supply heater core hose ) and an additive to put in your coolant system. The kit will not include new coolant so you will need to get that too. Install valve and connect a garden hose.Run motor specified time in the kit. Remove lower hose from your radiator and turn on the water from the hose full blast. Watch the coolant coming out from your radiator to see if any chunky stuff comes out - also watch for the color of the flow. Run water until it comes out clear, then shut off water and disconnect garden hose. Allow system to drain, reconnect radiator hose and cap flush valve. Refill coolant system, turn heat on high and run motor until it is warm. Top off coolant in radiator ( be careful - the pressure may cause coolant to spray out when you remove cap - put a rag over the cap before you remove slowly). If you do not have warm air at this point you may have a bubble in the heater core and may need to block rear wheels then raise the front of the vehicle until the radiator cap is higher than the heater core. Restart vehicle and turn heater on high . Check coolant level in radiator and top off, then cap radiator and shut off motor. Lower vehicle and start again with heater on high. If you still have no heat then your heater core may be plugged. To check, remove both heater hoses from motor and force air from an air compressor into one of the hoses, watching for flow from the other hose - if no flow then core is plugged and needs to be replaced, but if you have flow then you still have an air bubble in the system and need to purge using the above steps until you have heat. Hope this helps and please rate my solution - good luck!!