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This guy is mostly right, but these cars only have one (1) bolt holding the thermostat housing on, you have to take the piece of plastic trim off the intake that has "Fuel Injection 3800" embossed in it to get to the thermostat. As you're putting the thermostat housing back on wiggle it a little as you're tightening the bolt to mske sure it goes in all the way.
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Can you remove a 1991 Buick 38L engine without also removing the transaxle?
Not very easily if at all, and why would you want to?
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A haynes manual...
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