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| Tips and Maintenance Post helpful tips, maintenance guides and R&R procedures here (for both Pontiac Grand Prix and Oldsmobile Intrigue) |
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12-09-2006, 11:53 PM
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#1 | |
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AF Moderator
 
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Thermostat Replacement '97-'03 with SII 3800 Engine
How do I replace the thermostat in a '97-'03 Grand Prix with Series II 3800 engine?
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'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines |
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10-09-2008, 09:34 PM
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#2 | |
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AF Newbie
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Re: Thermostat Replacement '97-'03 with SII 3800 Engine
I am about to change the thermostat on my '98 GP. Do you recommend replacing with GM original equipment and what's the opening temp?
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10-09-2008, 10:57 PM
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#3 | ||
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AF Moderator
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Re: Thermostat Replacement '97-'03 with SII 3800 Engine
Quote:
AC Delco or aftermarket Stant Superstat brand.
__________________
'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines |
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10-10-2008, 12:14 PM
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#4 | |
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AF Newbie
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Re: Thermostat Replacement '97-'03 with SII 3800 Engine
Thanks for the info.
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10-30-2008, 06:57 PM
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#5 | |
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AF Newbie
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Re: Thermostat Replacement '97-'03 with SII 3800 Engine
Stupid me! I changed my antifreeze and forgot to change the thermostat. It seems to be opening ok but it is 11 years old today although the car has only done 89K km. Do you recommend changing it anyway?
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10-30-2008, 08:36 PM
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#6 | ||
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AF Moderator
Join Date: Jan 2005
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Re: Thermostat Replacement '97-'03 with SII 3800 Engine
Quote:
__________________
'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines |
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10-31-2008, 01:54 PM
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#7 | |
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stupidity should hurt
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Re: Thermostat Replacement '97-'03 with SII 3800 Engine
Another suggestion for help in bleeding the air out.
If the replacement t-stat doesn't have a jiggle valve in the flange to allow air to escape past when it's closed (the AC-Delco does), drill a small 1/8" hole in the flange prior to installing it. That way, as you refill the cooling system, air trapped in the engine is allowed past the t-stat. If you jack the right front corner of the car up so the radiator cap/filler neck is higher than the hoses, most if not all the air will be forced out while filling. Otherwise, getting these cars to bleed all the air out can be a NIGHTMARE!!
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