Of an '05 Pontiac grand prix. I can see the hoses that run into the firewall and attach to the engine with spring clips. I don't want to replace the heater core, just flush it. I was told that that might solve my problem of only lukewarm heat coming through the vents even when I have the temp knob all the way to HOT.
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Re: i want to flush the heater core
Take off the hoses at the bulkhead/firewall that go to te heater core, use a garden hose and back flush the core by forcing water through the smaller of the 2 hose nipples, if the water runs right through then you have a heater air temp control door actuator problem
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If you have warm air on one side and cool on the other, you've a situation with the vent flaps. But to backflush the core, take both hoses off the core and run a garden hose to the outlet side going towards the water pump. This will flush it.
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.
You have a plugged up heater core. Try pulling the heater hoses of where they go into the firewall, put a garden hose with a spray nozzle in one hose and gently flush the system out. you will need to pull both heater hoses off to do this.
clogged heater core very pop prob. check both hoses to firewall from back of engine pass side to make sure they are equal tmep if not it is a bad heater core you can flush these by removing the hoses and blowing them out with air or a garden hose also check to see if you hear a door closing in the vents when switched from hot to cold if you do it is safe to say itis a heater core
you have two hoses leaving the firewall and going to a bypass just under the alternator they are your input and out to your heater core feel them both when the vehicle is at operating temp if ones hot and the other is cold backflush the heater core by hooking a hose to the cold side and force water through the heater core make sure to disconnect both hoses before flushing though
Have you checked the coolant level? If that checks out ok... With the engine fully warmed up touch the heater core hoses where they go into the fire wall (about the center of the firewall). They both should be pretty hot to the touch. You'll likely find one hot and one warm. If this is the case flushing the heater core will likely get your heat blowing out hot again.
With the engine warmed up feel the heater lines going into the firewall. You will probably find that one is very hot and the other only look warm or even cold. If this is the case the heater core needs to be flushed. With the engine cold remove the hoses at a convenient location and back flush the heater core. Reconnect the lines and warm the engine back up with the heat on.
Replacing the heater is a challenge even to a seasoned pro, why? because of the number of components u will have to remove to access the heater core, the entire dash does'nt need to come out, but allot of the trim on it as well as the center console do, about a 4-8 hour job, a factory repair manual is not an optional thing, u need one or u will never get the core out much less a new one in with ruining it in the process.