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Bleed trapped air from coolant system ?

From : me

Q: i did an oil change and backflushed the heater core today because it wasnt too warm even when the engine had warmed upand it helped the heater to blow hotter than it was beforebut now i can hear the water sloshing around behind the dash when i rev up / accelerate. it sounds to me like there is a bit of air trapped in there. if thats the casehow can i bleed it off i let the engine idle for a few mins and took around the block a few times while keeping an eye on the temp gaugewhich didnt go any higher than normalso i also want to know if its safe to drive it like this .

Replies:

From : mac davis

on sat 25 oct 2008 233919 -0700 me thisisafakeaddress@fakeexample.fake wrote my dodge dakota has an air bleed next to the radiator cap... takes about a 3/8 allen as i recall.. yeahsorryit is a 2000 dak. should be the same ours is a 2001 with 4.7l built in 2000 mac please remove splinters before emailing .

From : me

i did an oil change and backflushed the heater core today because it wasnt too warm even when the engine had warmed upand it helped the heater to blow hotter than it was beforebut now i can hear the water sloshing around behind the dash when i rev up / accelerate. it sounds to me like there is a bit of air trapped in there. if thats the casehow can i bleed it off i let the engine idle for a few mins and took around the block a few times while keeping an eye on the temp gaugewhich didnt go any higher than normalso i also want to know if its safe to drive it like this and when i said wateri meant coolant ! .

From : roy

i did an oil change and backflushed the heater core today because it wasnt too warm even when the engine had warmed upand it helped the heater to blow hotter than it was beforebut now i can hear the water sloshing around behind the dash when i rev up / accelerate. it sounds to me like there is a bit of air trapped in there. if thats the casehow can i bleed it off i let the engine idle for a few mins and took around the block a few times while keeping an eye on the temp gaugewhich didnt go any higher than normalso i also want to know if its safe to drive it like this this is a problem with corvettes as well. you have to sorta burp them. park on a steep incline with the nose high open the radiator cap and run it the air will come out. vettes had a bleeder on the thermostat housing for this. .

From : me

i did an oil change and backflushed the heater core today because it wasnt too warm even when the engine had warmed upand it helped the heater to blow hotter than it was beforebut now i can hear the water sloshing around behind the dash when i rev up / accelerate. it sounds to me like there is a bit of air trapped in there. if thats the casehow can i bleed it off i let the engine idle for a few mins and took around the block a few times while keeping an eye on the temp gaugewhich didnt go any higher than normalso i also want to know if its safe to drive it like this this is a problem with corvettes as well. you have to sorta burp them. park on a steep incline with the nose high open the radiator cap and run it the air will come out. vettes had a bleeder on the thermostat housing for this. thanks royi just gave it a trytook the cap off and let it idle for a few mins and then topped it up a bit to replace any expelled air. then i took it round the block a few times and it wasnt nearly as noticablealthough one particular sharp left i made i did notice itbut after that i think it settled down . ill try it again tomorrow and see how it goes. ! by the wayive only had the truck a few months and i dont know when the last time it was flushed outif everthere was loads of brown shit came out when i flushed itbut it went clear after about 60 seconds still looks kinda dirty in the reservoir tooeven after refilling with coolantmaybe i should flush out the rad and reservoir too. i was trying to find a drain plug on the rad but couldnt find it. do you happen to know where it is its so tight down there i couldnt really tell. .

From : ddt

on a 97 dakotas the drain is on left lower rear. turn it a 1/4 turn left and pull out. im fighting heater core leak since flushing with prestone flush. wish i hadnt done that. added two small bars leak but it is still leaking. -- dick .

From : roy

i did an oil change and backflushed the heater core today because it wasnt too warm even when the engine had warmed upand it helped the heater to blow hotter than it was beforebut now i can hear the water sloshing around behind the dash when i rev up / accelerate. it sounds to me like there is a bit of air trapped in there. if thats the casehow can i bleed it off i let the engine idle for a few mins and took around the block a few times while keeping an eye on the temp gaugewhich didnt go any higher than normalso i also want to know if its safe to drive it like this this is a problem with corvettes as well. you have to sorta burp them. park on a steep incline with the nose high open the radiator cap and run it the air will come out. vettes had a bleeder on the thermostat housing for this. thanks royi just gave it a trytook the cap off and let it idle for a few mins and then topped it up a bit to replace any expelled air. then i took it round the block a few times and it wasnt nearly as noticablealthough one particular sharp left i made i did notice itbut after that i think it settled down . ill try it again tomorrow and see how it goes. ! by the wayive only had the truck a few months and i dont know when the last time it was flushed outif everthere was loads of brown shit came out when i flushed itbut it went clear after about 60 seconds still looks kinda dirty in the reservoir tooeven after refilling with coolantmaybe i should flush out the rad and reservoir too. i was trying to find a drain plug on the rad but couldnt find it. do you happen to know where it is its so tight down there i couldnt really tell. ah if you only flushed the heater core the crap from the rest of the cooling system will be right back into it. best to do the whole thing at one time. regards the drain i havent a clue. i always drop the lower radiator hose. thinking about it you say you have only had the truck a few months. where it is a 2k and if they are originals it might be time to change out all the hoses while your making a mess. .

From : mac davis

on fri 24 oct 2008 182813 -0700 me thisisafakeaddress@fakeexample.fake wrote i did an oil change and backflushed the heater core today because it wasnt too warm even when the engine had warmed upand it helped the heater to blow hotter than it was beforebut now i can hear the water sloshing around behind the dash when i rev up / accelerate. it sounds to me like there is a bit of air trapped in there. if thats the casehow can i bleed it off i let the engine idle for a few mins and took around the block a few times while keeping an eye on the temp gaugewhich didnt go any higher than normalso i also want to know if its safe to drive it like this it would really help to know what make model etc.. my dodge dakota has an air bleed next to the radiator cap... takes about a 3/8 allen as i recall.. mac please remove splinters before emailing .

From : roy

on fri 24 oct 2008 182813 -0700 me thisisafakeaddress@fakeexample.fake wrote i did an oil change and backflushed the heater core today because it wasnt too warm even when the engine had warmed upand it helped the heater to blow hotter than it was beforebut now i can hear the water sloshing around behind the dash when i rev up / accelerate. it sounds to me like there is a bit of air trapped in there. if thats the casehow can i bleed it off i let the engine idle for a few mins and took around the block a few times while keeping an eye on the temp gaugewhich didnt go any higher than normalso i also want to know if its safe to drive it like this it would really help to know what make model etc.. my dodge dakota has an air bleed next to the radiator cap... takes about a 3/8 allen as i recall.. i believe it is a 2k dak bro. roy mac please remove splinters before emailing .

From : tom lawrence

i was trying to find a drain plug on the rad but couldnt find it. do you happen to know where it is its so tight down there i couldnt really tell. you dont say what kind of vehicle you have but on most the drain is on the inside facing the engine of the radiator bottom-left drivers side corner. there should be a little nipple sticking down with a plastic valve that you can turn. you need to twist this counter-clockwise while pulling it out. its ok to twist it back and forth while pulling on it just so that you end up with it 90 from where it was the handle of the valve should be in-line with the nipple - just like a gas valve shutoff. .

From : me

on fri 24 oct 2008 182813 -0700 me thisisafakeaddress@fakeexample.fake wrote i did an oil change and backflushed the heater core today because it wasnt too warm even when the engine had warmed upand it helped the heater to blow hotter than it was beforebut now i can hear the water sloshing around behind the dash when i rev up / accelerate. it sounds to me like there is a bit of air trapped in there. if thats the casehow can i bleed it off i let the engine idle for a few mins and took around the block a few times while keeping an eye on the temp gaugewhich didnt go any higher than normalso i also want to know if its safe to drive it like this it would really help to know what make model etc.. my dodge dakota has an air bleed next to the radiator cap... takes about a 3/8 allen as i recall.. mac please remove splinters before emailing yeahsorryit is a 2000 dak. .

From : me

i was trying to find a drain plug on the rad but couldnt find it. do you happen to know where it is its so tight down there i couldnt really tell. you dont say what kind of vehicle you have but on most the drain is on the inside facing the engine of the radiator bottom-left drivers side corner. there should be a little nipple sticking down with a plastic valve that you can turn. you need to twist this counter-clockwise while pulling it out. its ok to twist it back and forth while pulling on it just so that you end up with it 90 from where it was the handle of the valve should be in-line with the nipple - just like a gas valve shutoff. coolill check that outmight as well flush the whole thing. and the sloshing noise seems to have cleared upand the heater is nice and toasty now at least. .

From : me

i was trying to find a drain plug on the rad but couldnt find it. do you happen to know where it is its so tight down there i couldnt really tell. you dont say what kind of vehicle you have but on most the drain is on the inside facing the engine of the radiator bottom-left drivers side corner. there should be a little nipple sticking down with a plastic valve that you can turn. you need to twist this counter-clockwise while pulling it out. its ok to twist it back and forth while pulling on it just so that you end up with it 90 from where it was the handle of the valve should be in-line with the nipple - just like a gas valve shutoff. coolill check that outmight as well flush the whole thing.coolant is cheap enough. heater is nice and toasty now at least too .