Coolant loss only when heater on.

[PeterGAH]

I m losing coolant but only when heater is on.

I got the low level warning 12 months ago. Topped up and it went for  a month 

Put some radweld in and it went for 3 months. 

The coolant drips from front bumper right side after a run on a hot day.

From time to time I noticed the curry smell in the car.

Recently I noticed that smell as I set cabin temp up from 19 to 24.

The leak Is related to the heater being turned on.

There is pink residue  on a component inboard from coolant reservoir and lower down.

It has what looks like a hex cap on top.

Difficult to see this item under a mass of pipes. What is this part.

Any of above sound familiar?

Peter

[PeterGAH]

I have found the leak.

It is a y shaped connector between expansion tank and engine part 1J0121087E

After a run on a hot day the heat soak raises system pressure and coolant squirts out of a hole in this plastic connector.

A new aluminium one is on order.

PeterGAH 

[PeterGAH]

Aluminium y joint now fitted.

Petergah