1989 Passat, coolant leaks cyl block

Well, I personally swear by Radweld for this sort of thing. However, everyone else I've seen on this NG swears AT it. So yer takes yer choice. Or else, yer puts up with a small leak.

Another possible option is to try to seal over the leaks by using JB Weld. This is an epoxy product and I think it's excellent. It's a bit akin to putting Araldite over the holes.

Rob Graham

Thanks Rob. I thought of Radweld, or something similar, because it seems best to try and seal the holes from the inside. However, I am concerned that it might coat the inside of the block and cause the engine to overheat. I'll have a look at JB Weld as you suggest.

al

In article , al writes

Could it be coming from the joint between the coolant elbow(black plastic with 3 temp sensors) and the flange on the cylinder head? On mine the flange was pitted and IIRC I sealed it with Hermetite

Not everyone. I would certainly recommend one bottle for this. If it doesn't work a new cylinder head gasket might be needed. I believe there are some posters who have got upset after using several bottles and gunging up their cooling systems.

Recently bought some Radweld to fix a small leak in the corner of a radiator. The bloke in the shop advised to turn the heater to cold to minimise the chance of it blocking the matrix, and to only pour it in when the engine's properly warmed up (taking the usual precautions!) - otherwise it sits behind the (closed) thermostat causing the infamous gunging. Worked a treat.