Heating

Post by **Tweedy** » Mon Jan 05, 2009 9:47 pm

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

Post by **simmitc** » Mon Jan 05, 2009 9:57 pm

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.

Post by **Tweedy** » Mon Jan 05, 2009 10:00 pm

Ok thanks a lot will give it a go tomorrow

Post by **PSL184** » Mon Jan 05, 2009 10:39 pm

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....

Post by **Tweedy** » Mon Jan 05, 2009 11:04 pm

Cheers will do

Post by **Tweedy** » Tue Jan 06, 2009 7:46 pm

Still no joy, The bottom hose stays cold

Post by **Tweedy** » Tue Jan 06, 2009 7:56 pm

Also the pipe from the cylinder head gets hot but the other one does not

Post by **simmitc** » Tue Jan 06, 2009 8:25 pm

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.

Post by **Tweedy** » Tue Jan 06, 2009 8:29 pm

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

Post by **PSL184** » Tue Jan 06, 2009 8:33 pm

Check the thermostat isn't jammed shut.....

Post by **Tweedy** » Tue Jan 06, 2009 8:36 pm

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

Post by **PSL184** » Tue Jan 06, 2009 11:07 pm

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....

Post by **bmcecosse** » Tue Jan 06, 2009 11:13 pm

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.