Repair Any Plastic Cracked & Leaking Radiator 15 minutes & $15 - Cheap, Easy & Fast 

Hi Suzanne! i'm in same predicament... curious to see if it worked for you? :)

Thanks brother, this is exactly what I was looking for.

@@CannonMan391 I've been looking for the same confirmation. Thanks!

Thanks for the update. I've got a real beater that hopefully can be on the road another 2 years, it just keeps starting and going. Not long enough to invest in a new radiator so hopefully a patch will work, just trying to figure out the best one.

Prep a rough surface as much as you can. Take your time and do it in layers.

Clixstorm DIY sadly it didn’t work out for me I did 3 layers let it sit for 2 whole days and for some reason not sure why but it made it worse didn’t last more than few hours before it looked like tea kettle shooting steam out of it.

I hadn't thought about that but see your ingenuity would have worked. I was using things I had access too. But I will keep that in mind.

That bars leak will clog you heater core,be warned.

You need a solvent that hardens but has some flex to it. A tiny amount to give to driving engine heat.

April Mansanares it's still holding. With all the heat, it's okay.

Yes. Leaking from crack to the bottom

I'm The Law if you are unsure, rapir only the crack from the outside.

First off i used to rebuild/repair radiators and even repaired heater cores that radiator shops claim they cant be repaired.. which is a lie to sell a new core.. more profit.. Plastic Radiators degrade over time based on heat and time.. as the older the plastic radiator ( a Nylon Composite) gets and hot, it degrades, mainly around the intake side of the radiator and becomes soft.. so repairing the crack is basically a temporary fix but can last a long time, depending on the age an how hot it gets.. Im replacing a radiator that is 22 years old 180,000 miles and the plastic around the intake side where its cracked, can be scraped off with my finger nail.. that is really soft.. I wouldnt fix it unless the plastic is hard.. when repairing plastic never use epoxy because it can come off, due to the fact moisture from the crack, can get underneath the epoxy and cause it to separate from the repair.. one guy suggested using Crazy Glue and baking soda as it becomes rock hard.. but i dont know if it is porous or not.. or if it will stick to the radiator.. for metal, you are right, if it can be fixed, personally i like to use expensive metal, silver solder.. I can use a bottle of map gas or propane.. but 50/50 is what I used in a shop setting..

General Motors recommends radiator sealant wafers, which will seal just about any leaking cooling system in a vehicle. They put them in all of their vehicles right after they roll them off of the factory floor and first fire the engines. That being said, putting multiple sealants into your cooling system can clog it up, making the issue of a leaking radiator the least of your problems, because now you have insufficient coolant going through to the motor, and you will overheat. Overheating a modern engine is death.

What about those on Governments Shut down or unemployment. You assume everyone can afford $200. 67million different lives in the USA. Probly a few who can't. Im still driving the car on these cheap repairs.

@@clixstormdiy4352 fairpoint and yes you do what you have to do to survive. All the best.

Agreed.

there nylon substrates...

Yes it is expensive. Pep boys wants to charge me 900-1000 for a new radiator. I'm on a small set income. No family. It's a small hairline crack just below the big hose connection to radiator I wiped it and can feel the crack with my finger. I can see it leaks . But if this quick fix with jb works it will buy me time 4 months just to save 1000.

Preparation is key. Another comment suggested fiberglass tape to help hold the crack.

Pour it in.