I have a Schwinn 26” Frontier with a loose crank. I tried tightening it and the crank is still loose but now my bearings...

There could be a few issues: 1. Check your window switch in different positions if your window is rolling up or down slowly or has intermittent stops replace the switch 2. Check the window track it may need to be greased or have something in it blocking your window. 3. After those two check your window regulator and your window motor if either one has not enough power it will keep the window from rolling up. If you need any kind of help with diagnoses let me know and I'll post step by step how to do each.

Security System: (1) The vehicle's security system might be preventing the engine from starting. (1) Test: Consult your owner's manual or a mechanic to troubleshoot the security system. (1) Engine Control Module (ECM): (1) A faulty ECM can disrupt communication between the various components, including the starter. (1) Test: Have a mechanic diagnose the ECM using a scan tool. (1) Faulty Wiring or Connections: (1) Loose or damaged wiring can interrupt the electrical signal to the starter. (1) Test: Visually inspect the wiring harness and connectors for any damage or corrosion. A mechanic can also use a multimeter to check for voltage and continuity. (1) Immobilizer System: (1) If your vehicle has an immobilizer system, it might be preventing the engine from starting if it detects an unauthorized key or a problem with the transponder chip in the key. (1) Test: Consult your owner's manual or a mechanic to troubleshoot the immobilizer system. Troubleshooting Steps: (1) Check for Error Codes: (1) Use a scan...