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Re: '86 Buick Century, torque converter not locking up
Did it work this past summer? I used to have an '86 Celebrity with same engine/trans combo with the same problem of TC not locking up. It only happened in cold weather, and temp gauge would not move much, which led me to find out the thermostat was installed upside down. Went ahead and installed new one (the correct way) and it fixed the problem. Not saying that's what you have here, just throwing out another possibility.
Oh, and if the head bolts haven't been replaced, beware. the original ones were prone to breaking, expecially when the thermostat starts working correctly!
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