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[djhorner]

the car seems to use alot of coolant when the heater is on but not as much if any when its not on i think i've traced it down to the heat bypass valve but any ideas??

[Lazydocker]

Symptoms do point that way. Check it for leaks with the heater in various positions

If it is faulty, genuine Vx is recommended as some pattern ones have been known to fail prematurely

[dbug]

Yep most likely faulty HBV - you should be able to get your hand down back of head and feel HBV to confirm if leaking

[djhorner]

cheers its a bit of a bugger as i can't see it need to take wipers off etc

[feeutfo]

It is easier alot with wipers and scuttle off, but not impossible.

Wipers are a 13 and a good thump to brake loose and remove.

But first you should be able to get your hand round the back and feel for water. Hot water mind.

[djhorner]

many thanks guys