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.
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.
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.
No, it is not bad for your car; most stop leak also includes anti rusting or lubricating agents; but it is also not designed to be a permanent fix. If you need stop leak for either your coolant or oil system, there is obviously some other problem that needs attention, (gaskets/seals) and really should be taken care of within a few months time, even if the stop leak cures the problem. In some cases, the size of the original leak may have a lot to do with the course of action on the repair. In coolant systems, a small leak MIGHT be repaired permanently with a stop leak that contains what looks like tiny balls of solder. Yes, it can be. Radiator stop leak can plug the passages in the radiator, heater core, or engine block.
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