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What is your question?
Dropped the engine out to do some work, then put it back in. before the work the cooling fan worked fine, afterwards it wouldn't come on. Replaced both coolant sensors(fan and Gauge) replaced the fan relay, finally replaced the computer. Fan comes on now but it comes on at 235 degrees and shuts off at 220, before it came on at 220 and shut off at 195. Dealer says that is how manufacturer wants it, seems too hot to me is this correct and if not how can i change it.
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I agree, 235 degrees seams a bit high for the cooling fans to turn on in your 1995 Pontiac Trans Sport. The different engines available in the transport used slightly different temp readings to turn the pusher and puller cooling fans on - there is no spec available to me for the 3.4L engine. The 3.1L and 3.L both turn on the puller fan about 220 degrees. Are you checking temp readings with a scan tool or using the gauge on the dash? Perhaps the gauge on the dash is slightly off...