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Heating
Posted: Mon Jan 05, 2009 9:47 pm
by Tweedy
Hi Everyone
I have flushed all the rubbish out of my radiator and pipework refilled with water and antifreeze and now the heater just blows cold, I know I will have air in it but how do you get it out.
thanks Bob
Posted: Mon Jan 05, 2009 9:57 pm
by simmitc
Run the engine up to operating temperature so that the thermostat is open, ensure that the heater control valve (the water one) is open, and any air should work its way round to the radiator.
Posted: Mon Jan 05, 2009 10:00 pm
by Tweedy
Ok thanks a lot will give it a go tomorrow
Posted: Mon Jan 05, 2009 10:39 pm
by PSL184
You might have to quickly pull off the heater return pipe to "burp" the system although generally they don't give too much trouble and bleed OK. I also find it beneficial to run it at a fast idle with the rad cap off sometimes to allow any bubbles to fully reach the surface....
Posted: Mon Jan 05, 2009 11:04 pm
by Tweedy
Cheers will do
Posted: Tue Jan 06, 2009 7:46 pm
by Tweedy
Still no joy, The bottom hose stays cold
Posted: Tue Jan 06, 2009 7:56 pm
by Tweedy
Also the pipe from the cylinder head gets hot but the other one does not
Posted: Tue Jan 06, 2009 8:25 pm
by simmitc
It sounds as thought either the heater is blocked or the water control valve is not opening correctly. Try disconnecting the heater hoses from the water control valve and the metal pipe that goes into the bottom radiator hose. Connect one of the heater hoses to a garden hose and flush through until clear water comes out of the other hose. Repeat the other way. This will both flush the heater matrix and also fill the heater with water. Good luck.
Posted: Tue Jan 06, 2009 8:29 pm
by Tweedy
Thanks will give it a go, the radiator and the pipe from the cylinder head gets hot it just the others also seem to be getting a bit of muck out of that metal pipe
Posted: Tue Jan 06, 2009 8:33 pm
by PSL184
Check the thermostat isn't jammed shut.....
Posted: Tue Jan 06, 2009 8:36 pm
by Tweedy
ok, I put a new one on at the weekend, mind you I suppose it could be faulty but I checked it before I put it on
Posted: Tue Jan 06, 2009 11:07 pm
by PSL184
If any doubts about the stat just run it until engine is hot without the stat in and see if all pipes get hot then....
Posted: Tue Jan 06, 2009 11:13 pm
by bmcecosse
If anything - a closed thermostat would push even more water through the heater - it could be stuck open ........ But usually - running the engine with the filler cap off - and topping right up to the neck with water, then giving it a few bursts of revs will push the water through the heater - unless the valve is closed of course.