How to clean inside of coolant expansion tank?

**n7plus1** · 04-07-2011 07:01 PM

i looked all over and cant find shit. is there any ideas or ways people have cleaned theres out on the inside to make it look new again? i want to refresh my old grey tank.

**Kittrell** · 04-07-2011 07:04 PM

Someone mentioned it on a thread here. Let me see if I can hunt it down.

*Edit, bam! I'll not give you shit for having posted in that thread........

http://www.audizine.com/forum/showth...ight=gray+tank

**poneman** · 04-07-2011 07:13 PM

I used an acid solution I use at work for cleaning beverage piping, it's a mix of phosphoric & nitric acid diluted 50% with water. Got 90% out though not all of the brown stuff came out of the baffles. I didn't want to soak it for too long as I thought it may eat away at the level sensor probe. BTW=A cheap way to get phosphoric acid is Behr concrete etcher at Home Depot, it's strong and works good at getting rust,scale off things if you don't happen to have drums of acid at your disposal. Worst case, $20 for a new one: Click

**Valve_Cover** · 04-07-2011 07:40 PM

buy a bottle of coolant flush (8$) at any parts store. Dilute it into water 50/50. Remove your coolant tank, block the holes, fill with the solution, and let it sit for a half hour shaking it every few minutes. Got mine looking like brand new.

**MikTip** · 04-07-2011 07:41 PM

Why not simply buy a new one!

**Kittrell** · 04-07-2011 07:59 PM

I think he likes his gray one.......

**Valve_Cover** · 04-07-2011 08:01 PM

Originally Posted by Kittrell

I think he likes his gray one.......

Actually I bought a brand new clear one with the new style cap, and after 6 months it was all yellowish for some reason, so i cleaned out the grey one and put it back in lol..