Took me 11 weekends to fix a leak in my truck because I kept guessing instead of buying a $12 hose
My day job is driving, so any truck downtime costs me real money, and I spent 11 weekends throwing parts at a coolant leak that a pressure test would have found in 20 minutes. I was so sure it was the water pump that I ignored the small puddle under the passenger side, and it turned out to be a cracked heater hose I could have swapped in my driveway after dinner. Why do we keep trusting our gut on repairs when the cheap tool tells you the answer right away?