Cooling system - Bleeding

[chrismac]

The interior heating is not working as it should, I suspect that there is an air blockage somewhere.
I know there are 2 bleeding points in the engine bay, The one near the bulkhead where the pipe enters the cabin. No bubbles from here.

The other is a bit trickier. From all the pictures, videos and descriptions I have seen I was expecting a cross headed screw on top of the thermostat housing, Cant see it but I do have this....



A single slot with a pipe on top - It seems to head under the battery.

Is this the bleed screw ? and has anyone seen this type before ?

TIA

 

[Pedro]

They are usually are just a plastic screw is that clipped in as it looks like a cable is attached ?

 

[Charlie1875]

That’s the original thermostat housing, probably not many cars left with the original housing still running, in theory you can carefully put a screwdriver in The off centre grove and unscrew to bleed it, however you will need to disconnect the wiring from the other end, but the plastic screw usually breaks.

a replacement thermostat housing will have a normal plastic screw for bleeding plus it should come with a wiring harness adapter to replace the original one

 

[chrismac]

Thanks both, The screw itself will loosen Ok, Might have a look on the weekend.