* Window Regulator: This is the most likely culprit. The regulator is the mechanism that actually moves the window up and down. Over time, the cables can fray, break, or the motor can wear out. If the motor is still working (window goes down), it's likely a problem with the cable(s) within the regulator itself.
* Window Motor: Less likely if the window goes down, but possible. The motor might be weak or partially failing. It could be strong enough to lower the window under its own weight but lack the power to lift it against gravity.
* Switch: The switch itself could be faulty. It might be sending the signal to lower the window but not the signal to raise it. Try testing it by moving the switch slowly, and if it feels loose or sticky, it could be worn out. Also check the other window switches to see if they are working properly, as sometimes it is a control module issue.
* Wiring: A broken or loose wire in the circuit could also be the problem. This is less likely if the window goes down consistently, but a loose connection could cause intermittent issues.
Troubleshooting Steps:
1. Check the Switch: Try the other window switches. If they work and *only* the driver's window is affected, the problem is less likely to be the central power window control module.
2. Listen Carefully: When you try to raise the window, listen closely. Do you hear any unusual sounds (grinding, clicking, whirring) from the door? These sounds can help pinpoint the problem.
3. Manual Test (If Possible): Some Caprice models allow for some manual manipulation of the window mechanism (often requiring panel removal), but you need to check if this is possible on your model before attempting it.
4. Visual Inspection (Requires Door Panel Removal): This is usually necessary to diagnose the regulator or motor. Removing the door panel will allow you to see the window regulator and motor mechanism. You can inspect for broken cables, damaged parts, or anything out of place. This will be the most definitive way to diagnose the problem.
Solutions:
* Replace the Window Regulator: This is the most common fix and usually involves removing the door panel to access and replace the regulator. This is often a DIY-able repair, with instructions available online (search for "1989 Chevy Caprice window regulator replacement").
* Replace the Window Motor: Less common than a regulator issue, but still possible.
* Repair or Replace the Switch: This is generally the easiest and cheapest fix.
Important Note: Replacing the regulator or motor can be time-consuming and require some mechanical aptitude. If you're not comfortable working on your car, it's best to take it to a mechanic. The cost of the repair will depend on whether you replace the part yourself or have a mechanic do it.
Remember to always disconnect the battery's negative terminal before working on any electrical components in your car. Safety first!
