Maybe some years ago, you had your car radiator repaired. Not these days. Car radiator
repairs are not as simple as they used to be. Radiators used to be made of all aluminum which you can weld or braze. Most of the time if you found a leak in your radiator you could simply fix it. This is not usually the case with today’s cooling systems. Most of them are made of plastic sides with an aluminum core. The plastic ones are not repairable in general.
The Truth About Car Radiator Repairs
What you may have heard: “You can do a radiator fix yourself, just solder your radiator fins or neck”… “Try some kind of adhesive or putty to stop the radiator leak” or “There is no way to fix radiators”.
The truth: Old classic car radiators used to be made completely of metal, typically brass or copper so you could simply use metal fillings to patch and repair them. You could just solder or braze them and this would restore them back to a fairly decent working condition.
New car radiators are made of at least two things. The first is aluminium. Automobile manufacturers use this as the “core” or, the part that does the heat exchange. Aluminium is much harder to repair than the brass or copper radiators that cars used to use. The cores of these radiators are thin so they cannot be welded and brazing can sometimes work, but it is hard to get the hole sealed.
Radiator Cap
The second thing that new car radiators use is plastic. They use plastic tanks on both sides of the core and they crimp the plastic tanks to the aluminium core. These crimped joints are sometimes prone to leakeage. While some radiator repair shops can re-crimp these joints they have to have special tools and equipment to do this. There is no way to fix these joints without special tools.
In addition to this, most cars and trucks today also have a transmission cooler built into the radiator. Any time you see red oily fluid mixed in with the coolant you have to suspect a transmission fluid leak into the coolant. The only good way to fix this is to replace the radiator.
Lim’s Auto Body is a full service auto body and mechanical repair shop locally owned and operated in Largo, Florida. For more information, go to our web site www.limsautobody.com or call (727) 422-3232.