Auto Parts and Repairs
Antifreeze and Engine Coolant
Heater Cores and Blower Fans

Can a heater coil clogged by Stop Leak be cleaned?

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Wiki User
2015-07-15 21:39:28
2015-07-15 21:39:28

YES - BY back flushing the heater core-same as back flushing the engine block-just use a garden hose.

Usually 'Stop Leak' will not clog the core. Try flushing the cooling system out first.

Note: The hot water goes in and the cooler water comes out. Flush the core going the other way so to clear any obstructions. If there is a clog, it might be something larger like bits of hose or corrosion. If the core is totally clogged, take it out and replace it with a new one. The amount of time you will spend doing this does not warrant using an old or used core.

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If it is water you have a plugged condensation drain line that needs to be cleaned out. If it is engine coolant you have a leaky heater core that needs to be replaced.

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caused by leaking heater core not radiator heater it is under the dash hard ot get to if the leak is not to big use radiator stop leak otherwise fix is going to be big bucks

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Be careful - some of these products can plug the heater core

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Are you sure it is a antifreeze leak? If so ,stop leak will not help heater core leaks.But make sure that is the problem.

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Stop leak will generally plug up holes u want plugged, but they will also plug up holes u don't want plugged. Better to fix the heater core.

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It is inside the heating A/C housing. The dash has to come out to get to it. A very involved repair. Even the most experienced master mechanics cringe at having to do a heater core repair. I would suggest putting some aluminum stop leak in the radiator. It will stop the leak in the heater core and will save you the grief of pulling the dash out.

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It should work assuming the leak isn't too big. Try it you have nothing to loose.

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You would pour it in the radiator. Caution, stop leaks usually clogs heater cores.

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Yes, A bad thermostat can keep the hot coolant from reaching the heater core... also, low coolant levels or a clogged heater core can make your heat stop working.

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You can try Stop Leak, in an emergency. The only real repair is replacement.

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The leak is probably caused by a faulty heater core. The heater core will have to be replaced. In an emergency, the hoses can be pulled off at the firewall from inside the engine compartment and spliced.

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Yes you can but that is a temporary fix. Some stop leak brands do more damage than good by plugging up everything else like the radiator for example. I recommend "Barr's" brand stop leak if you are going to use one.

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Repairing the leak depends on where it is. A stop leak additive may help for a while, but use care as some additives can cause the heater core to clog up.

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you most likely need a new heater core or it maybe the heater hoses that go to it are leaking.

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In many cases, yes. One of the many radiator "stop-leak" products, put into the radiator will normally do the job.Follow the manufacturer's instructions and add the stop-leak product, turn the heater on and set it to it's hottest of settings. Doing so will open the heater control valve, allow the maximum amount of radiator water to reach the heater coreand let the stop-leak product to do its work.The way most of these products work is, they cool and solidify when they reach the leak and are suddenly exposed to cooler air. Just don't forget to turn the heater on- if the control valve won't allow the heated radiator contents to get to the heater core, it won't do any good.Stop leak products sometimes do more harm than good. They can clog thermostats or reduce efficiency of radiator by reducing heat transfer ability. A quick fix is bypassing. Simply connect the two hoses together.

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Repair the pipe of fixture to stop your leak.

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have your radiator cleaned and replace your thermostate, clogged radiators and sticky thermostats can cause your engine to overheat under load.

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The leak may be from clogged Sunroof drains. Others have said that you can use compressed air to clear the lines to have them drain properly.

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To stop the black residue from a baseboard heater, the wall around and near the heater should be cleaned as there are dust particles attached to the wall. This is called ghosting which fine particles of soot attach to the wall that is cooler than the temperature.

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possibly clogged heater core, remove heater core hoses and flush with a hose until clean. reinstall hoses fill with coolant and let it run. if heater core is too plugged up you will have to replace it.

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Should be a permanent fix. However it may plug the small passages in the heater core


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