What Causes Power Windows to Work Sometimes but Not Others

Sound familiar?

We see this rolling drama all the time here in San Angelo. A power window that works sometimes but not always isn’t a quirky personality trait of your car. It’s a flashing yellow light before the red one. At Ric Henry’s Auto Service, we’re here to decode the mystery, tell you what’s really failing, and explain why you need a shop that’s been evolving with the industry to fix it, not just throw parts at it.

When a window has “intermittent” operation, we aren’t guessing. We’re testing three specific components that fail in predictable, annoying ways.

• Worn Window Regulator Motor Brushes
  Inside that little motor lives a set of carbon brushes. They transfer electricity to the spinning armature. Every time you roll your window up or down, they wear down just a tiny bit. After thousands of cycles, they get so short that they lose contact with the commutator. When they make contact? The window works. When they hit a dead spot? You get nothing. Tap the door, and vibration might jostle them back into place. That’s not a fix; that’s a stay of execution.
  
  
• The Dreaded Door Jamb Wiring Harness Flex Break
  Open and close your car door. Now do it ten thousand times. That rubber accordion tube between the door and the body (the jamb) houses a bundle of wires that flex constantly. Over time, copper strands inside the insulation snap from metal fatigue. One strand might still carry current, so the window works most of the time. But hit a pothole on Chadbourne Street? The broken ends separate, and the window quits. Park on a level driveway? They touch again. Magic? No. Intermittent electrical hell? Yes.
  
  
• Dirty Switch Contacts
  We don’t always think about it, but your window switch is a tiny mechanical device. Dust, coffee residue, and that general West Texas grit can coat the internal contacts. A dirty contact might pass 12 volts today but only 6 volts tomorrow, enough to make the motor groan or stop entirely. Unlike the other two issues, this one sometimes responds to aggressive button mashing, but that’s just grinding the dirt deeper into the contacts.

We don’t say this to scare you. We say this because we’ve been doing this for long enough to see the pattern. An intermittent power window is a component on hospice care. Whether it’s the brushes, the broken harness wire, or the switch, that part is failing. The “sometimes it works” phase is short. One day soon, you’ll be at the drive-through on Knickerbocker Road, and that window will refuse to go back up. That’s not a bad afternoon, that’s a security and weather problem.

Here’s where we get real. A general mechanic with a test light might tell you, “It’s the motor,” slap a new regulator in, and send you on your way. But if the real problem was a broken wire in the door jamb? You just paid for a motor you didn’t need, and the window will still fail next week.

That’s why you need a shop you can trust. One that’s been evolving with the industry. At Ric Henry’s Auto Service, we don’t guess. We use the same diagnostic tools and equipment that the dealership does, because we know modern cars aren’t fixed with a hammer and hope. We trace the circuit, measure resistance in the harness, check voltage drop across the switch and test the motor’s current draw under load. Only then do we tell you what’s actually broken.

We offer comprehensive auto repair services for everything from that finicky power window to a full engine overhaul. Our experienced technicians are equipped to handle a wide range of repairs, from minor fixes to major overhauls. And because we believe in doing the job right the first time, we carry a 3-year/36,000-mile warranty on all services we provide. That’s not a handshake. That’s a promise.

We also offer multiple other system maintenance services, brakes, suspension, cooling systems, you name it. Whether you drive a Ford F-150 that works the ranch or a Honda Accord that commutes to Goodfellow AFB, we’ve got you covered.

Trust Your Car in the Hands of Ric Henry’s Auto Service

Don’t let a window that works “most of the time” lull you into a false sense of security. Bring it to us. We’ll find the real failure, not just the obvious one. And we’ll fix it so that every time you press that switch, the window moves. No tapping. No swearing. No surprises.