Disconnect both hoses that go to the heater core from either end, (the end at the heater core or the end at the water pump, manifold, radiator, etc.) using a garden hose, preferably with a hose repair end attached to plug into the hose or a short piece of hose cut off to connect to the heater core, run water in each direction through the heater core until water runs clear, then reverse direction of flow. Repeat as many times as necessary until flow is restored and water runs clean. Be sure to also flush the rest of the cooling system or debris from it will likely just clog up the heater core again.
Remove the hoses going to the heater core. Use a regular water hose with a high pressure nozzle and flush both ways.
No it will not, it will just back flush the heater core and clean it out.
The heater core is on the back side of the firewall. It has 2 hoses of 1/2 inch diameter running into it. It is about in the center of the firewall. Take the 2 hoses off the firewall. Get a hose with good pressure and back flush the heater core by running the hose into the side with the long hose on it. If you are not sure which side to do then do it both ways.
Disconnect both heater hoses from the heater core or the engine, whichever is easier. Fabricate fittings to attach a garden hose to one of the heater connections. I direct the other heater connection into a bucket. Turn on the garden hose gradually until all the way open. Flush for 30 seconds. Reverse heater connections and back flush another 30 seconds. Reinstall heater hoses, top off radiator coolant reservoir. Done.
Disconnect both heater hoses from the heater or the engine, whichever is easier. Fabricate fittings to attach a garden hose to one of the heater connections. I direct the other heater connection into a bucket. Turn on the garden hose gradually until all the way open. Flush for 30 seconds. Reverse heater connections and back flush another 30 seconds. Reinstall heater hoses, top off radiator coolant reservoir. Done.
Your local auto parts dealer typically stocks a cooling system flush bib that will connect your garden hose to back flush the heater core. Disconnect both the heater hoses at the firewall (they are located behind the A/C condensor on the passenger side of the car) and connect the kit you picked up from your Auto Parts dealer.
You will see 2 heater hoses connected to the firewall. These are the inlet & outlet hoses going to the heater core. Disconnect them and then connect them together with a coupler. This will bypass the heater core.
Disconnect the inlet and outlet hoses going to the heater core at the firewall. Use a garden hose to flush the core starting by back flushing it by inserting the hose on the outlet side then moving to the inlet side. Continue flushing until the water is perfectly clean. Do not use too much pressure or you will cause a leak in the core.
You can drain the coolant from the radiator drain plug and just refill it or you can flush out the complete system including the radiator, heater core, heater hoses, block and replace the thermostat and the refill it back up...........
Have you used any stop leak in rad.? If you have pull off heater hoses and back flush heater core. Also check hot water control valve for heater.
I remove both heater hoses and use a garden hose to force water through the heater core. I just send water through both ways for a couple of minutes.
disconnect both the inlet and outlet hoses going through the firewall to the heater core... using a garden hose force water though one heater core hose until clear, then the other... do this several times until you have good flow of water in both directions... tips... try and use hot water through your garden hose... try to drain the entire cooling system and flush with water until clear and add a coolant flush additive and run engine for about 20 mins so the cleaner additive can break down some of the deposits... then drain and flush again.... if heater still does not work well.. then resort to disconnecting the heater core hoses and flushing and back flushing the heater core a few times... if all else fails, you might need to replace your heater core... good luck