heater not working

[goodall]

my car has stood for a while and the heater isnt working

it stood when i took the engine out to rebuild the cylinder head.
the thermostat was replaced and iv flushed the heater core out until it ran clear, the pipes to the core get plenty hot and there is a small increase in temperature if you between cold and hot, but only from freezing to cold...

not sure what the issue must be

[shark_90]

Are you sure all the air is out of the system? Sounds like an airlock to me.

[goodall]

well there is hot water running through the pipes would air lock not mean no water could run through

[220bhp]

Is the blower working.

[goodall]

yup blower works fine

i bleed it again there and flushed it backwards, working a wee bit better, still no were near as god should be with the at operating temp

[Fat Audi 80]

Does the flap work to change from hot to cold? (Just turning the knob is no good as this can sometimes turn on the shaft...)

Cheers,

Steve.

[Acidburn]

agree with steve on that.

What method you using to bleed the system?

[goodall]

i took the radio to make sure the knob turned the mechanism and also can feel the actuator moving up in passenger footwell...

could the flap be slipping on the shaft? dont want the hassle taking the whole dash out

bleeding it at the bleed screw on the bulk head, have i missed something?

[Acidburn]

When I did davids with him I didn't touch that screw as it has a tendancy to break.

Basically we had some spare fluid to top it up with. You take the header tank cap off and put a funnel in there, also slightly loosen the screw on the top of the rad and if someone sits inside whilst its started up and with the heater on run it up to temp keeping the header tank filled up to the level and also watch out for steam from the rad screw. run the engine up to temp and then tighten the rad screw and fill the header to the correct level and then put the cap on.

This is how we did davids (s2driveruk's) car and his was fine.

best to have two people doing it one inside watching the gauge and checking the temp and one outside, just take your time and watch out that you don't undo the rad screw that far its like a bleed screw on a pressure cooker.

[Acidburn]

with regards to the knob on the heater controls use a cloth and pliers and take the knob off, on the back you can tell if there is any wear plus it should have a metal ring on it.

[goodall]

ill have a good at that way tomorrow had to drive home from the cinema blowing cold air at the window
jim carreys new movie yes man is very good btw

as for the knob pulled off there, just used my hand wasn't on that hard, seems like its fine, there is a slot up the knob and grove in the spindle...

[GT500]

Have you been watching clockwork orange? seem to typing like they speak!