Chev Uplander 2006. 106k mi. 3 symptoms -related? Estimate cost? Should I trade

What is your question?

Symptoms: Oil pressure word warning .... ....comes on sometimes usually when going up long foot hill grade. Loss of power. Downshift to 3 then 2 - no problem. Van is loaded about 700# cargo + one driver + one overweight cat. Power steering fluid leak... Started out as pinhole. Now I'm refilling daily. Makes groaning sound turning left but not right. It's gotten louder. Van wasn't happy not being driven 2 weeks at a time, twice, in 6 week period. Steering wheel hard to turn when more fluid needed. Yellow engine light kicks on if going up long foothill grade. Overheats. Then will reset itself when back on the flats again. OnStar has said Its an emissions issue. Gas cap was replaced a couple months ago. Helped but didn't fully resolve. I got the more expensive good cap. Cheaper one didn't help at all. Front signal bulbs. Mechanics have tried replacing. New bulbs still don't solve problem. Tachometer dial upper right end burnt out. Estimate? Fix or trade? Good til this year.

What makes this problem better or worse?

Not driving makes worse. Avoid hot day driving. Avoid long up hills. Drive slower better.

How long has your 2006 Chevrolet Uplander had this problem?

Been troubleshooting about six months