Two small bore pipes connect to the coolant expansion tank with push on (and click) connectors.

One of these connections is dripping coolant. Is it possible to replace the connector, I do not know what it

is called or could you recommend a suitable sealant to apply before push fitting the pipe.

Thank you

Richard

The connector is permanently fitted to the tube, so if it is the connector that is broken you will need to replace the tube.

The actual expansion tanks are well known to leak so it may be some hairline cracks around the point that the tube connects. remember that these systems are pressurised when the engine is hot.

I’ve not examined one of these. Do they have a o ring in the connector that can be changed? A possible temporary bodge might be to wrap plumbers ptfe take round the outlet on tank and the push connector on.  I agree with unofix on the proper way

As isetta has said you could try some PTFE.

The liquid version is excellent, you can get it from Screwfix.

https://www.screwfix.com/p/flomasta-ptfe-liquid-50g/5321j?cm_sp=managedredirect-_-plumbing-_-ptfeliquid&_requestid=438456

 

if it just the o rings that have worn try replacing them both and use silicon grease on the new o rings to push them back in 

The connectors do have O rings. Be careful removing/refitting these parts as a lot of the plastic fittings become brittle with age.

I didn't have a problem with leakage, but still needed to clean off deposits from the connectors and expansion tank location bores before re-assembly.

I also smeared the O rings with silicon grease as vendman suggested.