Fluctuating Coolant Temp
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True Car Nut
Joined: Jun 2003
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From: Las Cruces, NM
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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True Car Nut
Joined: Jan 2012
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From: BC Canada
Quickly found this page shows small hole drilled in thermostat..
https://www.gmforum.com/2000-2005-90...-308341/page2/
https://www.gmforum.com/2000-2005-90...-308341/page2/
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1997 Buick Pk Ave (Soft Ride) Suspension!
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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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