Mk4 polo - replacing coolant query

[northernchappy]

The haynes manual recommeds removing the temp. sensor to help remove air when refilling and fit a new o ring to the sensor.
Can i get away without removing the sensor?
Reason i ask is I'm a coward for taking bits off i dont need to, plus, i cant find the bugger

 

[Burnerman]

Usually these things live on the cylinder head at the back, with a plug on electrical connection.....usually the O ring survives
Removing the bottom rad hose doesnt drain the block fully so try flushing twice, running the engine until the thermostat opens.
When youre done, check both heater pipes for getting up to temperature, and keep an eye on the coolant level for a few days.
John

 

[northernchappy]

Once again.. Thanks john.
Found this iagram if any others havethe same trouble locating

 

[Burnerman]

Useful diagram, that
Im not able to say how vital it is to remove that sensor, obviously any air will form at the highest point and may disperse itself.
Early models had a sensor that was held in by an omega shaped clip, later models had a screw fitting which needed a deep drive socket to shift them.
Good luck with the job!
John