# 65 mustang rust in motor

**URL:** <https://community.cartalk.com/t/65-mustang-rust-in-motor/141185>\
**Category:** Maintenance/Repairs\
**Created:** [May 29, 2019, 3:05am UTC](https://community.cartalk.com/t/65-mustang-rust-in-motor/141185 "2019-05-29T03:05:39Z")\
**Posts on this page:** 2\
**Page:** 2

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**Author:** ![mperry\_153483](https://avatars.discourse-cdn.com/v4/letter/m/a4c791/32.png) [@mperry\_153483](https://community.cartalk.com/u/mperry_153483)\
**Post date:** [June 20, 2019, 4:58am UTC](https://community.cartalk.com/t/65-mustang-rust-in-motor/141185/21 "2019-06-20T04:58:28Z")

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I’m glad to hear your problem cleared up. We used to use the Prestone hose flush method, back when your car was new. You’d often see owners following G-dad’s Model T experience and running straight water in their cooling systems.

You may have to repeat the cleaning in a year. With that much rust, your water pump and thermostat might not be long for this world. The same corrosion would eat the blades off the pump.

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**Author:** ![Purebred](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/purebred/32/46796_2.png) [@Purebred](https://community.cartalk.com/u/Purebred)\
**Post date:** [June 20, 2019, 12:21pm UTC](https://community.cartalk.com/t/65-mustang-rust-in-motor/141185/22 "2019-06-20T12:21:55Z")

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I know this is an old post but, from the MSDS for Thermocure:  
Water  
Diammonium Phosphate. 16%. Seems to be the active ingredient.  
Sodium Salts

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