Repair Cracked Plastic Radiator

Repair Cracked Plastic Radiator

Polyvance’s Radiator Repair Kit allows you
to fix a leaking plastic radiator tank.
To show how confident we are with our Radiator Repair Kit, we drilled a hole into a perfectly good radiator.
Not only did we drill a hole in the radiator,
but we cracked the tank with a chisel.
Before you start repairing, you will need to drain the radiator until the coolant level is below the hole.
Create a v-groove along the crack line about two-thirds of the way through the thickness of the plastic.
You can either melt a v-groove, or you can use a
rotary tool and grind a v-groove like we did here.
Plastic radiator tanks are made of nylon, which has a very high melting point of about 425 degrees Fahrenheit.
While it is not required, the repair will go faster
if you pre-soften the plastic with a heat gun.
Melt the nylon rod into the
v-groove with the plastic welder.
The rod should come out melted and a little
bit brown, but not discolored too badly.
While the melted plastic is still hot, use
the tip of the welder to stir together
the new plastic and the radiator plastic.
Keep mixing until the plastic is all one color.
You need a good mix of the existing plastic
and the new plastic to achieve maximum strength.
When the repair is complete, allow time
for the plastic to cool and re-solidify.
The car was started and allowed
to run for forty-five minutes.
Forty-five minutes allowed plenty of time
for the engine to reach operating temperature.
As you can see, there is no leaking whatsoever.

48 Replies to “Repair Cracked Plastic Radiator”

  1. Cool kit but… I have a lot tools but not a heat gun, not a laser thermometer, not a plastic welder melter thing. This is way to specific in tools which your average person WILL NOT HAVE!

  2. Ta de sacanagem 1 hora p chegar a 68°c no Brasil o motor ja liga nesta temperatura kkkkk e remendo sairia voando em 10 minutos

  3. Do you want to know how much Polyvance believes in their products? The radiator featured in this video was in a vehicle that belonged to Polyvance's Vice President. We drilled into his perfectly good radiator because we know our products work, and we knew we would be able to repair it. This repair was done around 7-8 years ago. This vehicle has since changed hands (but stayed in the Vice President's family.) The vehicle is still driven often. The repair on this radiator has held up all this time.

  4. Nice try Einsteins, but those style radiators crack and or become not sealed at the crimping points, have never seen that style crack as you show in the 47 years Ive been around vehicles…… BLUE DEVIL works well in heater cores, radiators as well as head gaskets….for a while & not permanently

  5. If it's a small hole or crack drill it out and put a expanding rubber freeze plug in tighten and your done no chance of the polycarbonate separating again fixed radiators like this for years !!!!!!

  6. Where was Polyvance in 2009 when my 2001 BMW E39 540i radiator started pissing? It was very expensive to replace with the unnecessarily snide service and cost that only BMW thinks is cute.That and many other problems put me off Beemers for life and it was my very first one that was also highly praised by Car & Driver. Danke schoen and run some hot Nylon up Angela Merkelator's ass before it's auf wiedersehen Deutschlandistan!

  7. If I'm gonna use all those tools (which I and basically my friends don't have), then I might as well have the radiator repaired in the shop.

  8. The kit is 80 bucks. My new radiator was 88 bucks at A1 auto .com. Probably a good tool for repairing something but not radiators not cost effective.

  9. What if you didn't use a chisel to put a crack in it? I only have a small thin crack but it is enough for fluid to bubble out, what's the best bond with heat resistance that can be used quicker than this approach?

  10. My '98 Chevy Tahoe has a pinhole on the plastic part of the radiator. Can I use soldering iron instead of buying a whole kit to melt the nylon rod? Just asking. It'll save me a bunch of money. Thanks.

  11. Visit this video page on our website to see the full list of products used and other helpful tips:

  12. Nobody has these tools are radiators aren't that expensive. They are 50 bucks on my car lol this is dumb.

  13. Stop drilling the end of the cracks helps in aluminum but melting the plastic should take care of it .When radiators weren't plastic I repaired a hole in a car battery with a prestone bottle and a hot glue gun.

  14. My radiator filler neck broke off. I stuffed an old glove in it 'til new radiator came. $55. on eBay. Free shipping.

  15. You can also take off a piece of plastic from the radiator itself to use as filling material.
    And use a soldering rod.

    Yes I am to give that a try for sure.

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