# Maybe heater problem?

**URL:** <https://forums.speedlife.net/t/maybe-heater-problem/103588>\
**Category:** SON240sx Automotive\
**Created:** [February 5, 2007, 9:16pm UTC](https://forums.speedlife.net/t/maybe-heater-problem/103588 "2007-02-05T21:16:45Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![Mista\_Sparkoh](https://avatars.discourse-cdn.com/v4/letter/m/3bc359/32.png) [@Mista\_Sparkoh](https://forums.speedlife.net/u/Mista_Sparkoh)\
**Post date:** [February 11, 2007, 8:36am UTC](https://forums.speedlife.net/t/maybe-heater-problem/103588/12 "2007-02-11T08:36:48Z")

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> [@HC Turbo Manifold](https://forums.speedlife.net/t/hc-turbo-manifold/8532/25):
>
> yeee same problem i had, temp gauge would goto cold while driving, just replace thermostat and your good to go,
> 
> WOuld a stuck open Thermostat give you bad gas mileage?

apparently it does  
I had the same problem but for some reason, when I got a used SR thermo from matty, it’s smaller than the one I have  
I jus replaced it but it seems that my original therm didn’t look like it was stuck open because the bottoms spring can still move.

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