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I am not sure if your engine is set up the same as the other 3.1's I have worked with but hopefully it is. Would recommend sqeezing the top hose repeatedly to force air into radiator, and, if yours has it, loosen the small fitting on the front left side of motor. On many 3.1's there is a black metal line that is in front of motor and it connects on the left side with two bolts. There should be a small fitting at the top of this and it will let air escape when purging. Either way I would fill up the radiator and let it idle. Loosen the fitting I described until fluid starts leaking. Then tighten just enough to stop the leaking. Do this 3-4 times. Then, while idleing squeeze the top hose several times to force air back into radiator. Watch the fluid level. When enough air is purged you will have to refill. Run for a while, let cool, and then top off again. Would check again in a day or two as air will continue to be expelled. Short of some kind of purge vacuum I do not know any better way. This worked well on my 91 Corsica, and son's old 94 Beretta. Of course it was not same model as yours so I just do not know if yours is set up the same....If someone has a better way please speak up.
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I used to be indecisive, now I am not so sure.
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