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Go Back   3800Pro.com Forum > Engine > Cooling System

Cooling System Discussions regarding radiators, water pumps, T-stats, hoses, etc...

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Old 08-13-2010, 09:32 AM
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Thermostat Information

Thermostat Description and Operation
The thermostat is a coolant flow control component. It's purpose is to help regulate the operating temperature of the engine. It utilizes a temperature sensitive wax-pellet element. The element connects to a valve through a small piston. When the element is heated, it expands and exerts pressure against the small piston. This pressure forces the valve to open. As the element is cooled, it contracts. This contraction allows a spring to push the valve closed.

When the coolant temperature is below the rated thermostat opening temperature, the thermostat valve remains closed. This prevents circulation of the coolant to the radiator and allows the engine to warm up. After the coolant temperature reaches the rated thermostat opening temperature, the thermostat valve will open. The coolant is then allowed to circulate through the thermostat to the radiator where the engine heat is dissipated to the atmosphere. The thermostat also provides a restriction in the cooling system, after it has opened. This restriction creates a pressure difference which prevents cavitation at the water pump and forces coolant to circulate through the engine block.

Thermostat Diagnosis
The coolant thermostat can be tested using a temperature (tempil) stick. The temperature stick is a pencil-like device which has a wax material containing certain chemicals that melt at a given temperature. Temperature sticks can be used to determine a thermostat's operating range by rubbing 87C (188F) and 97C (206F) sticks on the outlet coolant pipe.

Use a tempilstick in order to find the opening and the closing temperatures of the thermostat.

2006 MY information
188 tempilstick melts at 87C (188F). The thermostat should begin to open at 90C (194F).

206 tempilstick melts at 97C (206F). The thermostat should be fully open at 107C (225F).

Replace the thermostat if it does not operate properly between this temperature range.
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Old 08-13-2010, 10:25 AM
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Engine Overheat - 3800 casting coolant - detonation - hot intake - lower manifold overheat

Models:
  • 2006-2007 Pontiac Grand Prix
  • 2006-2007 Buick Lucerne, LaCrosse, Allure
Equipped with either the L26 or L32 3800 Engine

Condition/Concern:
Some customers may comment about a possible overheating condition. Upon inspection you may find that while the coolant temperatures on the I/P cluster and Tech 2 appear normal, the engine appears to be running hotter on the front bank and in severe cases, sounds similar to an incomplete combustion event may be heard.

Recommendation/Instructions:
On the L32 Supercharged Engine:

After the engine has been allowed to cool, remove the thermostat housing and thermostat. Once the thermostat has been removed inspect the inside of the lower intake manifold for a casting flash in the coolant passageway. If present the casting flash will appear in the area shown (1) in the picture provided. If the casting flash is present you must replace the lower intake manifold. Do NOT attempt to remove the flashing. If the casting flash is NOT present, then something else is causing the overheat condition.

man.jpg

On the L26 (non supercharged) 3800 Engine:
After the engine has been allowed to cool, remove the lower intake manifold. Once the lower intake manifold has been removed, using a flashlight, look for the presence of a casting flash or partial casting flash inside the coolant passageway in the manifold. There is one passageway on each side of the manifold where the manifold attaches to the cylinder head. Each passageway connects to a main passageway that runs parallel along the center underside of the manifold. If the casting flash is present it will appear where either side passageway connects to the main passageway. If there is a casting flash or partial casting flash present, the lower intake manifold must be replaced. Do NOT attempt to remove the casting flash. If the casting flash is NOT present, then something else is causing the overheat condition.
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Last edited by Caleditor; 08-13-2010 at 10:29 AM.
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Old 08-15-2010, 11:53 AM
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Quote:
Originally Posted by Caleditor View Post
2006 MY information
The thermostat should begin to open at 90C (194F).

The thermostat should be fully open at 107C (225F).
2000 MY

The thermostat should begin to open at 188F.

The thermostat should be fully open at 206F.

is the 2000 MY thermostat a 194?
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Old 08-17-2010, 01:02 PM
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the generic replacements are 195. Not sure what the actual AC Delco PN is.

Maybe time to get a good temp gauge and test the stat... My 180F keeps the car pretty consistent at 180-182, but if in hot traffic idling, not uncommon to see 190F.

ACDelco.com recommends:


THERMOSTAT ASM,ENG COOL
Part Number: 12T4D
Product Notes:
[All Makes-Standard Line Engine Cool Thermostat]; 180 Degree ; Alternate temp

Per Vehicle: 1; Years: 2000-2000





THERMOSTAT ASM,ENG COOL
Part Number: 12TP4D
Product Notes:
[All Makes-Thermostat-Eng Cool Premium Line]; 180 Degree ; Alternate temp

Per Vehicle: 1; Years: 2000-2000


THERMOSTAT ASM,ENG COOL
Part Number: 12T4E
Product Notes:
[All Makes-Standard Line Engine Cool Thermostat]; 195 Degree ; Recommended temp

Per Vehicle: 1; Years: 2000-2000



THERMOSTAT ASM,ENG COOL
Part Number: 12TP4E
Product Notes:
[All Makes-Thermostat-Eng Cool Premium Line]; 195 Degree ; Recommended temp

Per Vehicle: 1; Years: 2000-2000



THERMOSTAT ASM-ENG COOL (W/ GSKT)
Part Number: 131-120
Product Notes:
[Engine Cool Thermostat (w/Gasket)]

Per Vehicle: 1; Years: 2000-2000


Quote:
Originally Posted by Caleditor View Post
2000 MY

The thermostat should begin to open at 188F.

The thermostat should be fully open at 206F.

is the 2000 MY thermostat a 194?
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Old 08-17-2010, 01:28 PM
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Quote:
Originally Posted by n0dih View Post
the generic replacements are 195. Not sure what the actual AC Delco PN is.

Maybe time to get a good temp gauge and test the stat... My 180F keeps the car pretty consistent at 180-182, but if in hot traffic idling, not uncommon to see 190F.

ACDelco.com recommends:


THERMOSTAT ASM,ENG COOL
Part Number: 12TP4E
Product Notes:
[All Makes-Thermostat-Eng Cool Premium Line]; 195 Degree ; Recommended temp

Per Vehicle: 1; Years: 2000-2000

Lets just say the information I posted (2000 MY the thermostat should begin to open at 188F the thermostat should be fully open at 206F) is the correct information for this Thermostat. Then I would say you need to watch the fan settings or the T-stat will never fully open
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