When using blue devil head gasket leak If I can turn on heater with that prevent it from working properly
Any crap you put into the radiator for a quick fix you have the chance of plugging up the heater core and or radiator.
Your heater core is always 'on,' meaning coolant flows through it all the time, even with your heat turned off, so it will be affected by that gunk as well.
I should add, if there is any build up in the radiator or heater core due from neglect or not servicing, the stuff you pour in to stop a leak is designed to "stop a leak" The heater & radiator cores are small as it is.
Those so called sealers were designed for for big rigs with massive cooling systems, they were never intended for small vehicles as it tends to plug everything up, radiators, heater cores, small cooling passages inside the engine, that stuff really mucks things up when you try to do the repairs later on. Never add anything like that to your vehicle.
Never used the blue devil stop leak before but have used Alumaseal and bars leak with no problems matter of fact it's been almost two years now and no leaks and no problems. If you do use a stop leak and it does not work do not continue to add more hoping it will work that is when you can clog up the cooling system.
Blue Devil does work BUT you must follow the instructions EXACTLY as they're printed on the bottle! One of our customers uses it from time to time and we've never had any complaints about it. I work for NAPA. HTH. -Jim
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