# Bounce **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** nissan, pickup\ **Created:** [January 1, 2011, 5:11pm UTC](https://community.cartalk.com/t/bounce/59368 "2011-01-01T17:11:56Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![bedrock](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bedrock/32/868_2.png) [@bedrock](https://community.cartalk.com/u/bedrock)\ **Post date:** [January 1, 2011, 5:11pm UTC](https://community.cartalk.com/t/bounce/59368/1 "2011-01-01T17:11:56Z")
change water pump on a 1997 nissan pickup 2.4 liter.now temp coolant gauge bounce up and down from time to time any idea. ---
**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\ **Post date:** [January 1, 2011, 5:17pm UTC](https://community.cartalk.com/t/bounce/59368/2 "2011-01-01T17:17:14Z")
Did you change the thermostat and radiator cap? Also would have been a great time to change the coolant. ---
**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\ **Post date:** [January 1, 2011, 5:20pm UTC](https://community.cartalk.com/t/bounce/59368/3 "2011-01-01T17:20:29Z")
Sounds like air trapped in the system…Can be very difficult to bleed out in some cars… ---
**Author:** ![init2winit](https://avatars.discourse-cdn.com/v4/letter/i/54ee81/32.png) [@init2winit](https://community.cartalk.com/u/init2winit)\ **Post date:** [January 2, 2011, 4:36am UTC](https://community.cartalk.com/t/bounce/59368/4 "2011-01-02T04:36:57Z")
seeing as how it is a 1997 u may need a t-stat and radiator cap as well but if it wasnt doing this before the water pump change you have air trapped in the system.