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My vote goes to the TC board. Follow Jim's advice, it's spot on.
Before changing the thermostat, flush out the cooling system and put in new coolant. I use a 50-50 mix of green Prestone and steam distilled water. Water is from Kroger store. HEB to you SAT neighbors.
When refilling the system, stop befor adding the last gallon. The level will be low enough to open the thermotate housing and not have any coolant run out.
Get the dealer thermostat if possible. They are cheap anywhere, but....
Some tips on the job.
(1) Clean the surface of the block and housing where the thing fits. If you do use a razor blade scraper, be verry careful, use a light touch. The blade steel is harder than the head aluminum, and you can carve away some of the AL. BTDT. No gasket sealer is needed. The 0-ring does fine.
(2) I usually take the upper hose off the housing, then the housing off the head. It's easier to clean and that way, when installing, I can hold the thermostat in the housing using a loop of string or a wire and pulling it up into the housing.
(3) Mount the thermostat so that the little loose pin in the flange will end up at the 11 0'clock position. It's there to allow air to pass through. If it's at 12 0'clock, it can fall down and block the thermostat from closing.
BTDT, and the temp ran at 0800, low, on a 3 hour SAT to Houston drive. Bad to run cool a long time. Lowers gas mileage and raises emissions.
(4) Once finished and filled, run car 30 min or so to get thermostat to open. Shut down and quickly go and squeeze the upper hose a couple times to "burp" up any trapped air. Wear gloves, it's hot.
Good Luck,
Bob
:>)
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