# Coolant monitor

**URL:** <https://community.cartalk.com/t/coolant-monitor/169513>\
**Category:** Maintenance/Repairs\
**Tags:** tacoma, toyota\
**Created:** [September 3, 2020, 12:37am UTC](https://community.cartalk.com/t/coolant-monitor/169513 "2020-09-03T00:37:34Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Rocky\_197531\_170476](https://avatars.discourse-cdn.com/v4/letter/r/a183cd/32.png) [@Rocky\_197531\_170476](https://community.cartalk.com/u/Rocky_197531_170476)\
**Post date:** [September 3, 2020, 12:37am UTC](https://community.cartalk.com/t/coolant-monitor/169513/1 "2020-09-03T00:37:35Z")

</div>

So when i start the truck 1st thing in the morning, especially in the winter time, my temperature gadget goes through the roof!  
Yet…it’s not actually over heating, fluid is good.  
After i drive it about 20/30 miles down the highway, it drops down to half way.  
I’ve changed the thermostat twice, so what else could it be??  
TIA for all the helpful replies 🙂

---

<div class="post-metadata">

**Author:** ![tcmichnorth](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tcmichnorth/32/25126_2.png) [@tcmichnorth](https://community.cartalk.com/u/tcmichnorth)\
**Post date:** [September 3, 2020, 12:40am UTC](https://community.cartalk.com/t/coolant-monitor/169513/2 "2020-09-03T00:40:35Z")

</div>

Trapped air in the cooling system or a faulty temp sensor.

---

<div class="post-metadata">

**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [September 3, 2020, 12:42am UTC](https://community.cartalk.com/t/coolant-monitor/169513/3 "2020-09-03T00:42:25Z")

</div>

I would try replacing the coolant temp sensor.

Tester