Is Clr Safe For The Aluminum Heater Core And Water Pump? - Taurus Car Club of America : Ford Taurus Forum
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Old 04-03-2008, 06:48 PM   #1 (permalink)
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It's time for me to backflush the heater core that I just replaced last year. All I can figure is there was a lot of crap in the block and it is blocking flow to the core again. I pulled up the Ford service bulletin for flushing the block/core, and it calls for a cleaner to be put into the cooling system prior to flushing. I checked with my local Ford dealer, and they don't have/can't get the cleaner. They recommended I use CLR, and I know that I've read others hear have used it. I picked up some CLR, and it warns not to use it on aluminum. My question is, if I circulate this through the block per Ford's directions, is it going to give me any heater core/water pump issues due to them being aluminum?

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Old 04-03-2008, 07:35 PM   #2 (permalink)
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This reminds me of a story my mom told me.. Apparently my grandpa tried to used drain-o in so 60s era car and it ruined everything it touched


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Old 04-04-2008, 03:27 AM   #3 (permalink)
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Use Zerex Super Cleaner (drive aound for several hours type) or Super Flush (10 min flush type). These have a higher % of active ingredient and are closer in composition to the stuff in the Brown coolant TSB.
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Old 04-04-2008, 11:29 AM   #4 (permalink)
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My local autozone only has Prestone radiator flush, any idea where I can find these other cleaners?
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Old 04-04-2008, 11:32 AM   #5 (permalink)
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I'd use the prestone stuff.
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Old 04-04-2008, 11:59 AM   #6 (permalink)
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CLR would be fine. Iron Out also works.
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Old 04-04-2008, 07:18 PM   #7 (permalink)
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Pep boys carries Zerex. I think Murray's also does. Prestone will work but it's not as strong as Zerex. CLR and Iron out will work and are much much stronger than Zerex or the Ford stuff but as a chemical engineer I wouldn't use it unless it was a last ditch effort before pulling the heater core. The CLR will attack some of the internal coatings such as the one inside the bypass tubing. Will it matter for how long you will have the car? Who knows...
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