Fluctuating Coolant Temp - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-26-2016, 10:28 PM   #11
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Many suggest drilling a small hole in the thermostat (or use a predrilled unit) to aide in the purging of air from the system. Also, if your coolant is in poor condition, replace it with fresh coolant of the appropriate type.
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Old 01-26-2016, 10:35 PM   #12
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Quickly found this page shows small hole drilled in thermostat..
https://www.gmforum.com/2000-2005-90...-308341/page2/
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Old 01-26-2016, 11:07 PM   #13
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Hmm, I never heard that before, its not necessary right? I thought to purge air, u can just use the bleeder valve on top of the thermostat housing
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Many suggest drilling a small hole in the thermostat (or use a predrilled unit) to aide in the purging of air from the system. Also, if your coolant is in poor condition, replace it with fresh coolant of the appropriate type.
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