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Discussion Starter · #1 ·
I'm trying to find out what the stock thermostat temp is for my 07 4.3L engine. I plan to have a custom tune done shortly and need the info. As and FYI, I called the service dept. at my local GMC truck dealer and was told the thermostat opens at 212 degress. My digital temp gauge has never registered more that 195-200 and usually runs about 190.
 

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I'm betting 195
 

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every GM truck I have ever owned (2.8, 4.3, 5.0, 5.7, 5.3) the stock has always been 195 degrees
 

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The GM dealer replacement I bought for my '05 5.3 said 195 but the t/stat itself was marked 187??? My temp gauge always reads 210degrees, but when hooked to a scanner the scanner says its running at 190 degrees. I'll go with what the scanner reads.
 

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Discussion Starter · #6 ·
Thanks for the info. It pretty well matches the way my t-stat operates. So once again, I'm betting mystat is rated 195 degrees.
 
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