160 Degree Tstat with stock computer programming will it set off the CEL?

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Dec 2, 2009 | 04:36 AM

98BuickRegalGS

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From: San Diego CA

160 Degree Tstat with stock computer programming will it set off the CEL?

I know some cars will set off the check engine light if you get too cold of a Tstat without programming. Is this the case with the C5? Is 178 a better choice? Stock appears to be 195 so 160 is a lot colder. Im use to going from 195 down to 180 degree tstats in my past cars.

Dec 2, 2009 | 05:24 AM

vettenuts

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From: At the beach in little Rhody

The stock thermostat can be modified to open at lower temps by using a small shim. Cost is about $1. I prefer the 180 but it is colder up where I am than your location.

Dec 2, 2009 | 07:54 AM

92mr2turbo

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From: Atlanta Georgia

My car came with a 160*F and it runs on the highway at 175-185 cruising. No CEL's. No reprogramming of nothing. I have a 2000.

Dec 2, 2009 | 08:18 AM

Quicksilver Vert 01

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From: Somers, CT and Clermont, FL

St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16

Quote:

Originally Posted by 98BuickRegalGS

I know some cars will set off the check engine light if you get too cold of a Tstat without programming. Is this the case with the C5? Stock appears to be 195

A 160 degree thermostat will not set a trouble code and turn on the MIL on the C5. I've found that a stock 187 degree thermostat, that's been modified following vettenuts writeup, will maintain coolant temperatures in the 180-185 degree range at cruising speeds.

Dec 2, 2009 | 03:18 PM

lomoman

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Joined: Sep 2006

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From: Nassau NY

160 Tstat

I have a Summit 160 stat installed...no problems (knock on wood)

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