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.
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.
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.
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.
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.
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.
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
If you are getting a little to no heat, mostlikely the Heater core is clogged. Disconnect heater hoses by the alternator. Higher hose is the input and lower hose is output. Back wash the heater core with garden hose or compressed air. I actually connected the hoses backward to circulate the coolant in reverse flow. Usually get a good heat after this. I would correct the hoses in correct order after a good flush of the cooling system.
Flush out the heater coils. Disconnect the 2 hoses that go from the engine block labeled Heater that run from the front of the engine to the firewall. These are 5/8" hoses and a standard water hose repair female adaptor will fit nicely. Connect you water hose to this adapter and run clean water through the hoses until the water comes clean. Remove the adapter and connect the hoses back. You should bet very hot air back again.
Be very careful when you disconnect them, stock heater core had plastic pipes , twisting or bending the hose can break the pipes, then you will have to replace the core. I just complted this job and it is not too bad if you have the right tech sources. If interested sign up for the online tech manual alldat.com. the cost is $14.95 a year but well worth it. Remove the two heater hoses at the firewall and flush the heater core through there.
In most vehicles you can see two hoses that disappear into the firewall. These carry the hot water to and from the heater core. find where they come out and return to the cooling system and connect the outgoing and incoming with one single hose. You will need to have less water in the system once you do this. If you are doing this in the winter, obviously your heater will not work anymore. Also, if you have any overheating problems, you won't be able to draw heat off the engine by running the heater once you do this. You can bypass it, by unhooking the heater hoses under the hood, and installing a coupler between the two hoses, thus looping the coolant flow back to the engine, without it ever entering the heater core.Disconnect both heater hoses going through the firewall to the heater core. Connect these two hoses together.
I have a 94 Astro but the heater control valve should be in the same location. Look under the hood on the passenger side. There are two heater hoses behind the coolant reservoir and windshield washer reservoir. The hoses attach to the heater control valve. The valve has a round vacuum actuator on the side, and two more heater hoses leave the control valve and go into the heater core housing. Cost for the valve will probably be somewhere between $50 & $70 To replace it, remove the coolant reservoir and the windshield washer reservoir. Remember, or mark, the hoses for the washer if you have a rear washer. The electrical connections only go on one way. Remove the clamps securing the front heater hoses and remove the hoses from the valve. Remove the clamps holding the heater hoses coming off the back of the valve where they are attached to the heater core. These two hoses are factory attached to the valve and the new valve (from the dealer) comes with the hoses attached to the rear of the valve. The clamps are back in a small space behind the valve, rather hard to get to. We pulled the bracket with the three square relays situated above the hoses to allow easier access. Install in reverse order. Good luck.
more than likely your heater core is clogged. GM's extended life anti-freeze can become very gummy after 2years. The simplest thing to do is to back flush the heater core. There are two heater hoses going to it [located on the passager side fire wall]. Remove the clamps and hoses from the heater core and simply stick a running garden hose one of the nipples. If water doesn't come out of the other nipple in a few seconds, move the hose to the other nipple. Chances are that you will get a nasty glob of slime coming out. Repeat the process several times until you only get clean water coming out in both directions. The heater core is now clean and you may reconnect the two hoses. Start car and allow some temperature to build up. You should find a nice warm heat coming from the heater now.
unscrew the plastics piece under the glove box right above where your feet would be and the heater coil is in there. you will have to disconnect the hoses from under the hood right in front of the passenger side. there are only 2 hoses connected to it. then just put in a new heater coil and reattach the hoses and screw it back up. all done.
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