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Fluctuating Coolant Temp

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Old 01-26-2016, 09:28 PM
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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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Soft Ride (01-26-2016)
Old 01-26-2016, 09:35 PM
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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, 10:07 PM
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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
Originally Posted by rjolly87
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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