Suggestions for radiator cleaning/flushing
Thread Starter
Le Mans Master
Joined: May 2004
Posts: 5,386
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Suggestions for radiator cleaning/flushing
Well, I should start this post off by saying that some things got neglected in tearing down my car. One of those things being the radiator which was left outside for several months. Well, now that I have the time to go through the last of the "reusable or junk it" pile, I notice that the radiator is in the same shape as it was when I removed it. Meaning it's still good, no leaks, all of the cooling fins are in good condition. However the inside may have some debris along with residue from the old coolant still trapped on the inside. My question would be are there any recommendations as to what I can purchase to clean the radiator? Any home remedies worth trying (hot soapy water, etc.)? All advice is welcome. 
Race Director
Joined: Jun 1999
Posts: 14,924
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From: Merritt Ils Fl
Since it is a plastic/Al unit stay away from the acid cleaners. I used a liquid degreaser on mine both inside and out with plenty of reverse flush. One of the AC "A" coil cleaners will work also. These can be had at Lowes and/or Home Depot. If you are in a hurry, I'll bet Dawn and hot water will work too.
Thread Starter
Le Mans Master
Joined: May 2004
Posts: 5,386
Likes: 534
Originally Posted by Muffin
Since it is a plastic/Al unit stay away from the acid cleaners. I used a liquid degreaser on mine both inside and out with plenty of reverse flush. One of the AC "A" coil cleaners will work also. These can be had at Lowes and/or Home Depot. If you are in a hurry, I'll bet Dawn and hot water will work too.
Many thanks. I'm not in a hurry, so I'll apply all your recommendations to the radiator.
Team Owner
Joined: May 2002
Posts: 24,337
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
First off, run the garden hose through the upper and lower hose ports, alternate a few times till it comes out clear. Then go to the cleaners.
Also, when you refill your coolant, DO NOT use hose water. Buy some distilled water from the supermarket to mix with your green coolant.
Also, when you refill your coolant, DO NOT use hose water. Buy some distilled water from the supermarket to mix with your green coolant.
