Liquid cooling vest help

[C-5Quad]

I'm a quadriplegic and my body can no longer regulate my temps by sweating and as a result. I can not tolarate the summer heat for any long periods. So I'm building a liquid cooling vest. I'm using 1/4 in thin wall tubing sewn into a vest in several rows like a radiator and plan on using a 12v brushless water pump to circulate ice water from a small cooler mounted to the back of my powerchair to my vest to keep me cool.

my question is what can i use to adjust the pump speed to where I need it as I'm sure I wont need it going all out all the time. I'm thinking some sort of voltage regulator to use like a gain on an amp but don't know where to find one.

I want to be able to run the pump in cycles as i dont want it running non stop

the pump I'll be using
http://cgi.ebay.com/ws/eBayISAPI.dll...2882&viewitem=

any help would be great.