# WP flow rate

**URL:** <https://community.cartalk.com/t/wp-flow-rate/175010>\
**Category:** General Discussion\
**Created:** [February 15, 2021, 3:34pm UTC](https://community.cartalk.com/t/wp-flow-rate/175010 "2021-02-15T15:34:53Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\
**Post date:** [February 15, 2021, 3:34pm UTC](https://community.cartalk.com/t/wp-flow-rate/175010/1 "2021-02-15T15:34:53Z")

</div>

What is the flow rate thru a heater core? I think it’s 10-13 gpm thru radiator so I assume it’s lower thru heater hoses. I have flushed out cores using garden hose but it’s hard to do in zero deg weather.  
I have a sureflo pump but it’s 1 gal/ min I figure. Not enough flow or pressure

---

<div class="post-metadata">

**Author:** ![oldnotdeadyet](https://avatars.discourse-cdn.com/v4/letter/o/a6a055/32.png) [@oldnotdeadyet](https://community.cartalk.com/u/oldnotdeadyet)\
**Post date:** [February 16, 2021, 12:28am UTC](https://community.cartalk.com/t/wp-flow-rate/175010/2 "2021-02-16T00:28:51Z")

</div>

Don’t confuse flow and pressure. Your pump could have low flow but high pressure, especially if working against a blockage.