Remove one hose (which ever is easier to get off) from the heater core and start the engine if the hose a water coming out then it is the wrong hose if water comes from the heater core then you have the correct hose. I know this sounds tedious but it is the sure way to tell. Do not use plyers to remove the hose, this will bend the end of the pipe and make the hose leak. You are better off to remove the clamp and cut a short slice, the length of the heaer core pipe, and then shorten the hose to put it back on.
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Get a back flush kit from an auto parts store. You cut the heater hose that does NOT have the water valve in it. The kit has all the parts you need to accomplish it Once installed you connect a garden hose to it, take off the radiator cap and turn on the water. A lot of rust will come out. Now start the engine and turn on the heater to its hottest setting. It will take some time for the engine water to warm up , but the heater core will flush when you do this. After the water clears, put new antifreeze in the radiator , put the cap on the garden hose fitting and you're done. Run the engine until it opens the thermostat and add water if necessary.
drain coolant system locate heater cores hoses going through firewall you need to buy the radiator flush kit at any auto parts stores. remove heater cores hoses from one end or buy extra long heater hoses same size as heater core hoses in vechicle at auto parts store use the flush kit when you flush through one of the heater core hoses let the other hose drain in a drain pan when you use home garden hose use low water pressure dont use garden hose to the max or you will rupture heater core. your best bet let radiator shop flush whole coolant system. because heater cores hoses are in a tight spot.make sure engine off if you just going to flush out heater core only .after flushing heater core good time to replace heater core hoses.if job too hard or complicated let radiator shop flush out radiator the engine block and heater core because if radiator stopped up or engine block stopped up the gunk and rust will reenter plug up heater core.if you tight on money you can flush out your own radiator.drain out radiator using large drain pan. remove top radiator hose and remove bottom radiator hoses connect to water pump.use garden hose with flush kit part with water pressure not too high put garden hose to top radiator hose run water until clear water run out bottom radiator hose in drain pan,the flush out engine block remove thermostat.if you had another spare thermostat housing with RTV SILICONE SEALANT THAT HAS SET UP INSTALL THERMOSTAT HOUSING BACK TO ENGINE WITHOUT THERMOSTAT FLUSH OUT THE ENGINE BLOCK, WHEN DONE INSTALL NEW THERMOSTAT THEN INSTALL ORIGINAL THERMOSTAT HOUSING WITH NEW ORING WHICH YOU BUY AT DEALERSHIP.IF ALL SOUND COMPLICATED LET RADIATOR SHOP FLUSH OUT COOLANT SYSTEM.
Technically it does not matter which heater hose you use. When the garden hose is attached to the tee fitting, and you open the drain for the radiator, clean water will flow thru the cooling system with the engine running. Keep in mind you may need to take the thermostat out to get flow without the engine being hot.
buy a flush kit from Walmart, about 5 bucks. cut the top heater hose add the kit hook-up water hose then on the bottom driver side of radiator unscrew plug and drain, then turn on water hose flush till clear, then add your coolant
at the bottem on the left or the side there is a small key like screw ( righty tighty lefty lucy } then u must remove the radiator cap and also remove the themastate be sure to attach the therma housing and hose and unatch it at the top of the radiator the put water hose in the open cap area and flush for 20 mins turn on engine and let run for 2 min and repeat flushing untill all antifrez desapears. be sure to put every back tack pitchures as you remove so to put back the same way it might be good to get new thermastate
purchase a flush kit, and the flush cleaner from you local autopart store....there are instructions on it on where to put the hose adapter, I think you have to cut the input heater hose (one that goes from the core to the water pump) and splice in the provided tee from your purchased flush kit. run the cleaner through you cooling system and flush and fill....easy job...only take an hour....DO NOT forget to pull the drain on your radiator, people forget this all the time. Oh and enjoy watching all the gunk get flushed out...it is usually a sight to see. good luck
the best way is go to a Radiator shop and have a power flush done. You should remove the thermoast and put houseing back on flush with air and water togeter eng,rad,heater need to be flush.if real bad do it over but you nee air and water mix for a good job.
go to auto zone/ O"rileys and buy a flush kit, it is a kit that allows you to cut, a heater hose and install a TEE with a cap on it, the cap end is also the hookup for a water hose, wait until the engine is cool, cut the hose install TEE, hook up water hose, remove radiator cap, turn water on low, crank engine and flush until water is clear, reinstall cap and your block,radiator is flushed, don"t forget to put in coolant
cut and insert the "T" from the flush kit on the heater hose outlet or inlet. make sure you are cutting into the heater hose coming out of the firewall heater area and not a large vacuum line. if your not sure ask a mechanic.
connect the kits anti syphon to water hose and connect to the T you have installed , open the radiator , and flush very slow if engine is hot , or wait till engine is cool as a very cold flush can damage the engine.