Heater Core :/

Hi guys,

I suspect my heater core is leaking. I'm getting a little dampness in the passenger foot well. I'm still not sure if it's coolant but I think it is. It hasn't rained in a week...

Have any of you attempted a replacement? Any tips on how to do it? I have the service manual here for the car but I can't find anything on it. Is there a decent stop leak product could save me some hassle?

I've taken the glove box out and the centre console but I still can't really see anything.

Car is a 99 rezzo ga15 hatch
Thanks,
Peter

Have you been using your Aircon lately ?

Nah not recently, I did change the coolant and flush it thoroughly. There was a lot of crap came from the heater. Bits of rust and lime scale type stuff.

I've since found that just as the car reaches temp the upper hose feeding into the core was leaking a bit, maybe I didn't tighten the clamp enough. Done now,
and I've put a bit of sealant around the grommets as they don't seem to be sealing anymore.

Do you think I would see any issues with an endoscope? Or is the matrix tucked away inside the heater ducting?