Heater core hose leak


New Member
Sep 16, 2010
I have a coolant leak in one of the heater hose near the firewall, the one towards the passenger side(thicker one). The hose clamps that connect the rubber hose to the engine/metal tube is not accessible at all. I got a flexible plier like below :

Amazon product
View: https://www.amazon.com/Flexible-Clamp-Pliers-Locking-Water/dp/B07C3LYZM7/ref=asc_df_B07C3LYZM7/?tag=hyprod-20&linkCode=df0&hvadid=241955516116&hvpos=&hvnetw=g&hvrand=16385037051596626429&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9002007&hvtargid=pla-644018367086&psc=1

I was able to barely compress the clamps, but then it popped and rotated more towards the firewall, making it even more inaccessible. If I remove the other hose (thinner and closer to the drivers side), I might be able to reach the first hose clamps. But the second hose clamps are inaccessible with a plier as well.

One of the you tube videos shows success with the flexible pliers on the first host. Another one has the presenter suggesting to break the clamps with a screw driver. I have also read about removing the upper intake, which would make both hoses accessible.
This is for a 2003 V6 Mustang.

If anyone has come across this, I would like to hear suggestions and experiences.

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