How To Repair a Plastic Radiator at Home with a DIY Kit

By | April 6, 2019

How To Repair a Plastic Radiator at Home with a DIY Kit
A leaking plastic radiator can be fixed with DIY kits or even with a soldering iron.

Often when a leak is seen on a plastic radiator many think it must be replaced, when it can be repaired at home easily.

Repairing a leak is an easy task that most any DIY backyard mechanic can do.
There are three ways to repair a plastic radiator.

3 Ways to Repair a Plastic Radiator

  • Use a soldering iron to melt the plastic back into place.
  • Use epoxy that melts into the radiator fixing the leak.
  • Solder the leak then apply epoxy.

If you have a soldering iron, putting your soldering skills to work would be the cheapest option.

For those that don’t have a soldering iron they are low cost items.
Weller D650 Industrial Soldering Gun

Using epoxy also has good results. The epoxy melts into the plastic sealing up the leak.

Many kits are available such as this one on Amazon.
Versachem 90214 Plastic Tank and Radiator Repair Kit – 30 Grams

The third option is to do both soldering and epoxy which doubles up on the leak making it last much longer if not for good.

How To Repair a Plastic Radiator Soldering Method
Drain the radiator if the fluid is leaking out as the spot needs to be dry.

Clean the spot that is leaking and get any grease removed from the location. WD-40 or similar can be sprayed at the target which cleans it up nicely.
How To Repair a Plastic Radiator at Home

A soldering is than used to go along the leak melting the plastic back together and sealing it.
How To Repair a Plastic Radiator at Home DIY

It will depends how big the crack is as to how much melting of the plastic needs to be done.
Tutorial Repair a Plastic Radiator at Home with a DIY Kit
After melting the plastic testing it to see if it is still leaking is the only way to know if its fixed.

Often epoxy is used in combination to make sure the leak doesn’t come back.
How To Repair a Plastic Radiator Epoxy Method
Using epoxy is a common method that uses chemicals when combined cause a reaction that generates heat melting everything together.
How To Repair a Plastic Radiator at Home with Epoxy
Epoxy has the added benefit of adding more material to a leak which can be a problem when the walls of a radiator are too thin.

Mixing the substances tougher that come in a kit is a straight forward easy job. Be sure to get the area clean before applying it.
Fixing your own radiator is a big money saver especially when looking at replacements.

Most leaks are simple to fix and can be fixed within a hour or so.

Joints can be harder to repair but the same principle is used. Often a joint is harder since they are in an inconvenient location which sometimes requires removing a part that is in the way.

Removing the entire radiator for hard to reach spots is the best way to fix it. Having good access to the problem area is ideal.

Have you fixed a plastic radiator before? Let us know about it in the comment below.



3 thoughts on “How To Repair a Plastic Radiator at Home with a DIY Kit

  1. Brian

    Thanks for your thoughts. Have a Sabaru rad. tank with a 1/2″ crack. Looking for some options.

  2. Sylvia

    I have not ever repaired a radiator b4 but due to finances am going to give it a try. My car is not overheating but a hairline crack is now spewing coolant and smells hot. Do i need to drain radiator 1st?

    1. Bradley

      Hi there.
      My mk1 golf radiator nipple broke off. The one that connects to the overflow pipe.

      Can I use pratly putty to seal leakage?


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