Symptoms of a failing heater?

Hi, it seems to be quite common. Just buy some "Radweld" (radiator sealant) put it in, give your car a run on the motorway (I think its best to get it pretty hot), and it should steam no longer. I repaired mine this way, and I had steam coming out of the vents! If this doesn't work, then you can investigate other posibilities but I think it will.

Goodluck

Guy

I'd rather not try the motorway -- partially blank off the radiator airflow, and keep an eye on the temperature gauge.

If something does go wrong on the motorway, it can get expensive.

Or bung a raw egg in there. But probably best stick with the Radweld unless you're stuck in the outback.

Ahh, the old raw egg trick, I guess you don't bung the yolk in too, just the white? Do you know anyone who's done it?

In my case it was the tiny hose that circulates coolant to the intake plenum. It was leaking at the fitting to the plenum allowing coolant to run down the valve cover and then onto the valley gasket where it would pool. The pooled coolant fumes come right in the air vent but are somehow only noticeable when the heat is on. Try tightening the clamp.

I didn't find the leak until half way into tearing the dash apart to replace the core, a very tedious experience.

I'd like to know what the symptoms of a working heater were, I have not experienced them yet.