Question about Broan-NuTone 658 Central Heating System Heater

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Centre heating got a raddater not working all the rest are whats wrong

No heat no air coming out when trying to bleed

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Rad valve could be stuck down turn valve s off then reopen , or turn off all rads and leave this one on and see if it gets hot may have air lock in rad flow pipe .

Posted on Jan 19, 2013


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My heat. blow cold air what is wrong with it it is a 2003 kia sedona ex

you have to bleed your cooling system with the heater on until all the air is purged out of it then it should heat up quickly.

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I have 3 zones on my boiler and I am trying to bleed the one thats not giving heat, no water comes out when you bleed it whats wrong 1 will not bleed


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Hi, my firebrid 115 wouldnt start tuedsay after running out of oil, had a deliverary of oil and my oil man bled the boiler as it had a air lock, the heating was working fine the rest of the day and a

He may have bled the lines but did he also bleed the fuel filter as well. All oil tanks have an oil filter in them, sometimes two. He could hav bleed the lines but still had some residual air in the line, the filter, or somewhere else along the supplu side. I"m sure if you call and explain the situation they will come and rebleed the rest of the air out of the system,especially if you're a regular customer. Also have them check the tank fuel filter, if it's clogged that too would keep oil from getting to the burners.

Dec 04, 2014 | Water Heaters

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1994 Toyota pickup / 4WD / 4 cyl. Replaced heater core. Checked heater control valve- working correctly. Filled system from upper hoses at firewall to fill heater core. Connected hoses. replaced...

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Feb 01, 2011 | 1994 Toyota Pickup

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I have antifreeze in the reservoir just changed the thermostat and gasket, all the fuses are good and the blower works great on my Mazda MPV year 2000, but I still have no heat only cold air is coming out...

Air lock in cooling system not allowing coolant to circulate through heater core. Need to bleed air or burp air from cooling system. Look for a bleeder valve by the engine side of the upper radiator hose possibly or on radiator.

Nov 21, 2010 | 2000 Mazda MPV

2 Answers


hi, if you have changed the above and you know they are working then did you do the following.

when you filled the coolant back up did you undo any bleed screws in the top hoses running around the top of the engine( if you have got none then its a self bleed system) you then need to undo these all the way if you have them, then just trickle the coolant in to prevent build up of air lock as this will cause over heating.

then when you have reached the coolant level you need to put the bleed screws back if you have them if not dont worry its self bleed system, once the level is reached you need to start the engine and leave the coolant filler cap off then wait until the temp is up to normal running temp then refit the coolant cap.

if after doing the above check you have got heat inside the jeep turn the heater on to full heat and turn it on if it comes out hot then this indicates the coolant is pumping around the engine properly, if its cold then you have some problems.

if its cold then this could point towards faulty thermostat, faulty water pump or worse case blown head gasket, if you have heat and it still over heats then you need to check if the rad fan is coming on when it gets hot if its electronic, miss this if its running all the time.

if its still over heating and the fan is working as it should be then you can only have 2 problems left, the first would be the water pump but if you have heat in the jeep from the heater then this points towards the pump working, so all thats left is the head gasket this could have failed and is a big cause of over heating problems.

let me know how you get on or if you need further assistance ok

plz rate this solution as i have a whole page of unrated posts, thanks

Aug 27, 2010 | 2004 Jeep Wrangler

1 Answer

Exactly the same problem

what u need to do is turn off all your rads except the 1 that is working and run the heating that should push any blockage round the system do the same with other rads that are blocked then try bleeding the rads and filling boiler if neccecary

Jun 06, 2009 | Combi Centre DX - Mango

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No heat at all in my 2002 Ford Ranger

the water pump or the heater core probably the water pump

Jan 29, 2009 | 2003 Ford Ranger Regular Cab

1 Answer

I have a 1996 nissan sentra gxe.... I just replaced the radiator today and the car still over heated, my only thought as to what the problem could be was the water pump. how do I change the water pump?

sounds like you have a thermostat problem also did you bleed the cooling system of all the air before you put the radiator cap on?
if you have not bleed the system and there is a air lock you will have over heating problems.
the way you can try bleeding the car is let it get up to temp with the rad cap off and let the fans cycle twice and wate till all the air bubbles stop stop coming out.
if the air dosn't stop coming out for a long long time you may have a blown head gasket

Dec 08, 2008 | 1996 Nissan Sentra

1 Answer

Gas heat radiators in the home

Hi there,

Not sure that I can help but will give it a go for you. I have never heard of bleeding Gas Heaters and usually they don't need that. Work on one heater at a time. If you can blow compressed air through the lines this may clear the flow. Best way is if you can get to the gas lines by removing a cover and then remove the gas line as close to the gas source. Gas heaters tend to carbon up and the air pressure tends to clear them. If you can't get to the gas lines you can try blowing the air back through the main jet at the front of the heater. Sounds to me like the jets are partially clogged and just need to be cleared. If you manage to remove the main pipe make sure you tighten it back up to avoid any gas leaks. Before trying to light it check for gas leaks as well. Hope this helps


Jan 03, 2008 | Heating & Cooling

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