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Pontiac Trans Sport was created in 1990.
The horn is under the left head light .
(4.3L) 4.5 quarts oil and filter change.
Sound like you're out of oil.
185 hp
It's concealed in the roof
Remove the two bolts on top of the headlight. Then lift the headlight slightly until it breaks free, and replace bulb by twisting it counter clockwise
under the floor mat on the passenger side
If an automatic transmission ,broken bands in the tranny.
On the lower driver side of the radiator!
Wiring for 91 Pontiac Transport: http://www.auto-olds.ru/PONTIAC%20TRANS%20SPORT%201991.pdf
I dont understand your question.