How to Quickly Repair a Pinhole Heater Hose Leak

Here’s a neat little fix that might help you out sometime if you ever get a small leak in your heater hose.

I discovered a small pinhole leak in one of my BMW coolant hoses. As usual, the parts store didn’t have the hose on the self, but could obtain one the next day.

While the leak was not a gusher, it did deplete the system enough to light up the low coolant warning and make a mess under the hood. The “fix” consisted of cutting a rubber patch and spreading one side with blue form-a-gasket (i.e. Permatex RTV Blue). After the cooling system temperature subsided, I clamped the patch (gooey side centered over the hole) to the hose with some sturdy twist-ties. Hose clamps would have worked – I just didn’t have the right size in my possession at the time. I let it set overnight and drove it the next day without a leak.

The bottom line: if you’re in a pinch, this repair might help you out, necessity being the mother of invention.

Author: Charlie Snyder

2 Comments

  1. Tom Huynh

    another fix to add is vypar’s x-treme tape. It’s a silicone tape that is self amalgamating(binds to itself). I love this tape and I swear by it. It’s something to add to your first aid kit or emergency kit in your 02.

  2. Tom Huynh

    another fix to add is vypar’s x-treme tape. It’s a silicone tape that is self amalgamating(binds to itself). I love this tape and I swear by it. It’s something to add to your first aid kit or emergency kit in your 02.

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